ORCID Profile
0000-0003-2206-5350
Current Organisation
Australian National University
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Geophysics | Earthquake Seismology | Seismology and Seismic Exploration | Geotectonics | Geodynamics | Geology | Neural Networks, Genetic Alogrithms And Fuzzy Logic | Optimisation | Structural Geology | Mathematical Sciences Not Elsewhere Classified | Geology Not Elsewhere Classified | Environmental Sciences Not Elsewhere Classified | Geochemistry not elsewhere classified | Volcanology | Geophysics not elsewhere classified | Tectonics
ANZSRC Socio-Economic Objective (SEO)
Earth sciences | Expanding Knowledge in the Earth Sciences | Other | Oil and gas | Natural Hazards not elsewhere classified | Oil and gas | Mineral Exploration not elsewhere classified | Exploration | Mineral Resources (excl. Energy Resources) not elsewhere classified | Environmental and Natural Resource Evaluation not elsewhere classified | Expanding Knowledge in the Information and Computing Sciences | Other environmental aspects |
Related Links
Publications
Guidelines for building a detailed elastic depth model
Publisher: Society of Exploration Geophysicists
Date: 2000
DOI: 10.1190/1.1444723
Abstract: We developed guidelines for building a detailed elastic depth model by using an elastic synthetic seismogram that matched both prestack and stacked marine seismic data from the Gippsland Basin (Australia). Recomputing this synthetic for systematic variations upon the depth model provided insight into how each part of the model affected the synthetic. This led to the identification of parameters in the depth model that have only a minor influence upon the synthetic and suggested methods for estimating the parameters that are important. The depth coverage of the logging run is of prime importance because highly reflective layering in the overburden can generate noise events that interfere with deeper events. A depth s ling interval of 1 m for the P-wave velocity model is a useful lower limit for modeling the transmission response and thus maintaining accuracy in the tie over a large time interval. The sea‐floor model has a strong influence on mode conversion and surface multiples and can be built using a checkshot survey or by testing different trend curves. When an S-wave velocity log is unavailable, it can be replaced using the P-wave velocity model and estimates of the Poisson ratio for each significant geological formation. Missing densities can be replaced using Gardner’s equation, although separate substitutions are required for layers known to have exceptionally high or low densities. Linear events in the elastic synthetic are sensitive to the choice of inelastic attenuation values in the water layer and sea‐floor sediments, while a simple inelastic attenuation model for the consolidated sediments is often adequate. The usefulness of a 1-D depth model is limited by misties resulting from complex 3-D structures and the validity of the measurements obtained in the logging run. The importance of such mis‐ties can be judged, and allowed for in an interpretation, by recomputing the elastic synthetic after perturbing the depth model to simulate the key uncertainties. Taking the next step beyond using simplistic modeling techniques requires extra effort to achieve a satisfactory tie to each part of a prestack seismic record. This is rewarded by the greater confidence that can then be held in the stacked synthetic tie and applications such as noise identification, data processing benchmarking, AVO analysis, and inversion.
Quasi-spherical approach for seismic wave modeling in a 2-D slice of a global Earth model with lateral heterogeneity
Publisher: American Geophysical Union (AGU)
Date: 2005
DOI: 10.1029/2004GL022180
AusMoho: The variation of Moho depth in Australia
Publisher: Oxford University Press (OUP)
Date: 23-09-2011
The influence of 3-D structure on the propagation of seismic waves away from earthquakes
Publisher: Springer Science and Business Media LLC
Date: 08-2002
Seismic structure of the Yilgarn Craton, Western Australia
Publisher: Informa UK Limited
Date: 06-2003
Seismic tomography with P and S data reveals lateral variations in the rigidity of deep slabs
Publisher: Elsevier BV
Date: 11-1999
Crustal surface wave velocity structure of the east Albany-Fraser Orogen, Western Australia, from ambient noise recordings
Publisher: Oxford University Press (OUP)
Date: 20-06-2017
DOI: 10.1093/GJI/GGX264
Seismic source characterization using a Neighbourhood Algorithm
Publisher: American Geophysical Union (AGU)
Date: 15-10-2000
DOI: 10.1029/2000GL011559
Ambient seismic noise tomography of Australian continent
Publisher: Elsevier BV
Date: 2010
Simultaneous use of multiple seismic arrays
Publisher: Oxford University Press (OUP)
Date: 21-01-2017
DOI: 10.1093/GJI/GGX027
A wavelet-based method for simulation of two-dimensional elastic wave propagation
Publisher: Oxford University Press (OUP)
Date: 09-2002
Geophysics: A new way to estimate seismic source parameters
Publisher: Springer Science and Business Media LLC
Date: 04-1983
DOI: 10.1038/302659A0
High-frequency Po/So guided waves in the oceanic lithosphere: I—long-distance propagation
Publisher: Oxford University Press (OUP)
Date: 07-10-2013
DOI: 10.1093/GJI/GGT344
Intra-plate volcanism in North Queensland and eastern new Guinea: A cryptic mantle plume?
Publisher: Elsevier BV
Date: 03-2020
Regional phases in continental and oceanic environments
Publisher: Oxford University Press (OUP)
Date: 08-2001
Australian seismological referencemodel (AuSREM): Crustal component
Publisher: Oxford University Press (OUP)
Date: 09-11-2013
DOI: 10.1093/GJI/GGS004
Sn-wave velocity structure of the uppermost mantle beneath the Australian continent
Publisher: Oxford University Press (OUP)
Date: 17-03-2018
DOI: 10.1093/GJI/GGY109
Working towards LGBTIQ-inclusive education: perceptions of pre-service teachers’ comfort and emotional experience
Publisher: Informa UK Limited
Date: 28-11-2022
Interlocking of heterogeneous plate coupling and aftershock area expansion pattern for the 2011 Tohoku-Oki Mw9 earthquake
Publisher: American Geophysical Union (AGU)
Date: 03-2012
DOI: 10.1029/2011GL050703
Anisotropy in the Australasian upper mantle from Love and Rayleigh waveform inversion
Publisher: Elsevier BV
Date: 12-2000
On a Wavelet-Based Method for the Numerical Simulation of Wave Propagation
Publisher: Elsevier BV
Date: 12-2002
Mid-lithosphere discontinuities beneath the western and central North China Craton
Publisher: American Geophysical Union (AGU)
Date: 13-02-2017
DOI: 10.1002/2016GL071840
Radial earth models revisited
Publisher: Oxford University Press (OUP)
Date: 18-06-2020
DOI: 10.1093/GJI/GGAA298
Abstract: The current set of reference models for the radial variation of Earth structure have been in use for several decades, and provide a good representation of many aspects of the seismic wavefield. Nevertheless, strong constraints from the differential times between pairs of SmKS phases indicate the need to modify the P wave speed profile in the upper part of the outer core. In order to incorporate such a change and maintain the representation of the full suite of seismic phases compensatory adjustments have to be made, dominantly in the mantle. Using multi-objective optimization, a new preferred radial model ek137 has been generated that provides a good representation of the traveltimes of all core phases. An adiabatic profile can be maintained through most of the outer core, but departures are needed at the base, as in the ak135 model. The latest estimates for inner core shear wave speed are included in ek137.
Azimuthal Variation of Lithospheric Heterogeneity in the Northwest Pacific Inferred From Po/So Propagation Characteristics and Anomalously Large Ground Motion of Deep In‐Slab Earthquakes
Publisher: American Geophysical Union (AGU)
Date: 05-2021
DOI: 10.1029/2021JB021717
Abstract: High‐frequency oceanic Pn/Sn ( Po/So ) phases ( Hz) recorded at ocean bottom seismometers in the northwest Pacific display strong azimuthal variations in propagation characteristics. In the direction parallel to former Pacific plate motion (N30°W), seismograms show a gentle rise at the onset of Po/So followed by large, long spindle‐shaped coda Po has a low‐frequency ( .25 Hz) precursor and much delayed high‐frequency signals, showing weak dispersion with frequency. For orthogonal propagation, the onset of Po/So rises sharply and bursts of Po reverberations in the seawater follow. These differences indicate a strong azimuthal dependence of the scattering waveguide effect of the oceanic lithosphere. Numerical simulations of seismic waves in three‐dimensional heterogeneous structures reveal that much of the observed Po/So propagation variability can be explained by laterally elongated fine‐scale heterogeneity in the oceanic lithosphere, with a correlation distance of 20 km in the direction parallel to the magnetic anomaly, and a much shorter correlation distance in the perpendicular and depth directions. The longer axis corresponds to the observed Pn/Sn ‐wavespeed anisotropy in the northwest Pacific, so the heterogeneity pattern was also developed during the formation and growth of the Pacific plate competing processes produce different styles of fine‐scale effects. The elongated heterogeneity distributions in the oceanic lithosphere are carried into the subducting Pacific slab allowing energy from deep‐focus earthquakes to propagate to large distances, producing observations of anomalously large ground motions in specific directions. The behavior can be matched with three‐dimensional simulation of high‐frequency wave propagation with a heterogeneous Pacific slab.
Sensitivity kernels for finite-frequency surface waves
Publisher: Oxford University Press (OUP)
Date: 09-2005
The influence of lateral variations on seismic refraction interpretation
Publisher: Springer Science and Business Media LLC
Date: 1976
DOI: 10.1007/BF00875658
Structural controls on the Mw 9.0 2011 Offshore-Tohoku earthquake
Publisher: Elsevier BV
Date: 10-2011
New constraints on the current stress field and seismic velocity structure of the eastern Yilgarn Craton from mechanisms of local earthquakes
Publisher: Informa UK Limited
Date: 17-11-2015
Evolution of mantle structure beneath the northwest Pacific: Evidence from seismic tomography and paleogeographic reconstructions
Publisher: American Geophysical Union (AGU)
Date: 07-2006
DOI: 10.1029/2005TC001909
Earth Structure Across Many Scales
Publisher: American Geophysical Union (AGU)
Date: 23-05-2022
DOI: 10.1029/2021CN000156
Abstract: Over my research career I have worked on many aspects of Earth Structure on scales from the whole globe to the very local, this has provided insights into the nature of heterogeneity and the importance of features with small length scales (up to tens of kilometers) revealed with higher‐frequency seismic waves ( Hz). Progress in determining 3‐D structure depends on representing the dominant variation with depth and large‐scale structure as a starting point. Intermediate and fine scales of heterogeneity (less than 100 km), below the typical resolution of seismic tomography, play an important role in shaping the seismic wavefield. The larger scales of variation in seismic structure can be directly linked to geodynamics through the influence of temperature and composition. The smaller scales retain a memory of past processes that can link to geochemical studies.
A slab in depth: Three-dimensional geometry and evolution of the Indo-Australian plate
Publisher: American Geophysical Union (AGU)
Date: 12-2007
DOI: 10.1029/2007GC001657
Valuing COVID-19 as an opportunity to understand teacher agency
Publisher: Springer Science and Business Media LLC
Date: 23-08-2023
DOI: 10.1007/S10833-023-09488-4
Abstract: This paper seeks to better understand how unanticipated disruption influences teacher agency and professionalism. Drawing on a conceptual model of teacher agency the paper examines data from teacher focus groups conducted in one Australian K-12 school to understand the lived experience of teachers (n = 50) during an initial COVID-19 lockdown period, particularly how they successfully navigated the transition to online teaching, and subsequent changes in practice and pedagogy. A grounded theory approach to data analysis revealed five conditions shaped teacher experience and a sense of personal achievement during this disruption: (1) an open in idual mindset (2) permission to be flexible and respond in appropriate ways (3) reduced complexity (4) effective relationships with leadership, colleagues, students, and parents and (5) parental support. Temporal and affective dimensions of teacher agency (iterational—past projective—future, and practical-evaluative—present) were used to explore the relationship between the five conditions and action for change. Findings suggest teacher agency was enhanced by focused school-based support which enabled teachers to deal with rapid change. Such support effectively facilitated reduction in complexity, provided structural and systemic assistance, valued and respected teachers as the professionals best placed to manage the shift to online learning, provided teachers with permission to try and fail, and enabled collegial support through a variety of communities of practice and structural support. Implications and future areas of research presented.
New constraints on the seismic structure of West Australia: Evidence for terrane stabilization prior to the assembly of an ancient continent?
Publisher: Geological Society of America
Date: 2007
DOI: 10.1130/G23341A.1
The inversion of surface wave data
Publisher: Springer Science and Business Media LLC
Date: 1976
DOI: 10.1007/BF00875784
A unified concept for comparison of seismograms using transfer functions
Publisher: Oxford University Press (OUP)
Date: 12-2012
DOI: 10.1111/J.1365-246X.2012.05693.X
Abstract: The comparison of seismograms plays a central role in seismology in erse ways such as relative time-shifts, propagation effects between stations for a common source, and inversion for source or structural studies. Different measures for comparison have been used in the various situations, but all can be linked by the use of the concept of a transfer operator between a reference seismogram and a comparator trace. Transfer operators are implicit in various methods of phase velocity estimation, receiver functions and anisotropy studies, and measures for estimating arrival times and litude variations. Such transfer operators have a number of important roles first they allow a visual assessment of the similarities of seismograms, secondly they provide a useful description of propagation effects for a common source in terms of the evolution from a reference station, and thirdly the transfer operator provides a means of representing seismogram differences in inversion without dominance by the largest litude arrivals. Whereas many time-domain measures of the degree of fit between an observed seismogram and the corresponding synthetic seismogram depend on the difference between the traces, which can be readily disturbed by minor misalignment, the transfer operator can readily represent a time offset while retaining a suitable measure of the similarities between the traces. The transfer operator concept can be applied with weighting or windowing of seismograms, and can be expressed in the time and frequency domains, or even in frequency time. This approach provides a means of representing and quantifying differences in the character of two seismograms that are visually apparent, in the time or frequency domain, but which get suppressed in any single measure of fit. We show how transfer operators can be usefully employed in many aspects of seismology with emphasis on frequency-domain representations at low frequency, and the time domain for higher frequency applications. We can express the general goal of inversion as the reduction of the transfer operator between observed and synthetic seismograms to the identity, thereby avoiding dominance by the largest arrivals and enhancing the influence of the full range of propagation processes. Broad classes of measures for comparison of times of arrival and litudes with quasi-linear properties can be constructed from the transfer operators through the use of a simple weighting function. This versatility highlights the unifying character of the transfer operator and greatly simplifies the design of measurements targeted at specific aspects of the Earth's structure.
A reappraisal of regional surface wave tomography
Publisher: Oxford University Press (OUP)
Date: 07-2002
Automatic infrasonic signal detection using the Hough transform
Publisher: American Geophysical Union (AGU)
Date: 03-09-2008
DOI: 10.1029/2008JD009822
Contrasts in regional seismic wave propagation to station WMQ in central Asia
Publisher: Oxford University Press (OUP)
Date: 10-2003
Propagation of distinct Love-wave pulses from regional to teleseismic distances in continental and oceanic environments
Publisher: Oxford University Press (OUP)
Date: 16-01-2020
DOI: 10.1093/GJI/GGAA028
Abstract: Surface waves are usually dispersive with long wave trains and steady decay of litude with distance. However, if the group velocity is nearly constant for a span of periods a strong pulse is produced that retains its litude for large distances. This situation arises for the fundamental mode of Love waves in the period band 40–500 s for crust and mantle structures with a positive gradient of S wave speed in the uppermost mantle. Such a distinct Love-wave pulse with limited dispersion observed at teleseismic distance is termed the G wave in honour of Gutenberg. The long-period G-wave pulse caused by large earthquakes carries a large amount of energy to substantial distances, with significant effects across the globe, for ex le event triggering. A similar G-type Love-wave pulse with a much shorter-period of 10–20 s is generated for crustal structures without thick sediment. Such pulses produce anomalously large ground displacement at near-regional distances with, for ex le an overestimate of surface wave magnitude. We investigate the generation and propagation mechanism of the G-type Love-wave pulses in the crust and upper-mantle with the analysis of observed strong motion records from the Mw 6.2 2016 Central Tottori earthquake and the Mw 9.0 2011 Off Tohoku earthquake in Japan, in conjunction with 3-D finite-difference simulation of seismic wave propagation and analysis of dispersion curves.
Seismic wavefield calculation for laterally heterogeneous whole earth models using the pseudospectral method
Publisher: Oxford University Press (OUP)
Date: 12-1998
Global Love wave overtone measurements
Publisher: American Geophysical Union (AGU)
Date: 02-02-2007
DOI: 10.1029/2006GL028671
Enhanced waveguide effect for deep-focus earthquakes in the subducting Pacific slab produced by a metastable olivine wedge
Publisher: American Geophysical Union (AGU)
Date: 09-2016
DOI: 10.1002/2016JB013300
Areal parameter estimates from multiple datasets
Publisher: The Royal Society
Date: 11-2019
Abstract: A wide range of methods exist for interpolation between spatially distributed points drawn from a single population. Yet often multiple datasets are available with differing distribution, character and reliability. A simple scheme is introduced to allow the fusion of multiple datasets. Each dataset is assigned an a priori spatial influence zone around each point and a relative weight based on its physical character. The composite result at a specific location is a weighted combination of the spatial terms for all the available data points that make a significant contribution. The combination of multiple datasets is illustrated with the construction of a unified Moho surface in part of southern Australia from results exploiting a variety of different styles of analysis.
Futurescaping: school choice of internationally mobile global middle class families temporarily residing in Malaysia
Publisher: Informa UK Limited
Date: 05-02-2019
Optimal spherical spline filters for the analysis and comparison of regional-scale tomographic models
Publisher: Elsevier BV
Date: 2012
Pervasive seismic low-velocity zones within stagnant plates in the mantle transition zone: Thermal or compositional origin?
Publisher: Elsevier BV
Date: 11-2017
The transition from the Thomson Orogen to the North Australian Craton from seismic data
Publisher: Informa UK Limited
Date: 29-10-2020
Seismic wavefield calculation for laterally heterogeneous earth models-II. The influence of upper mantle heterogeneity
Publisher: Oxford University Press (OUP)
Date: 12-1999
RESEARCH NOTE Stacking three-component seismograms
Publisher: Oxford University Press (OUP)
Date: 04-2000
Uppermost mantle structure of the Australian continent from Pn traveltime tomography
Publisher: American Geophysical Union (AGU)
Date: 03-2016
DOI: 10.1002/2015JB012597
USPSTF2013 versus PLCOm2012 lung cancer screening eligibility criteria (International Lung Screening Trial): interim analysis of a prospective cohort study
Publisher: Elsevier BV
Date: 2022
Fiber-Optic Airplane Seismology on the Northeast Greenland Ice Stream
Publisher: Seismological Society of America (SSA)
Date: 04-2023
DOI: 10.1785/0320230004
Abstract: We present distributed fiber-optic sensing data from an airplane landing near the EastGRIP ice core drilling site on the Northeast Greenland Ice Stream. The recordings of exceptional clarity contain at least 15 easily visible wave propagation modes corresponding to various Rayleigh, pseudoacoustic, and leaky waves. In the frequency range from 8 to 55 Hz, seven of the modes can be identified unambiguously. Based on an a priori firn and ice model that matches P-wave dispersion and the fundamental Rayleigh mode, a Backus–Gilbert inversion yields an S-wavespeed model with resolution lengths as low as a few meters and uncertainties in the range of only 10 m/s. An empirical scaling from S wavespeed to density leads to a depth estimate of the firn–ice transition between 65 and 71 m, in agreement with direct firn core measurements. This work underlines the potential of distributed fiber-optic sensing combined with strong unconventional seismic sources in studies of firn and ice properties, which are critical ingredients of ice core climatology, as well as ice sheet dynamics and mass balance calculations.
Modelling of seismic waves in heterogeneous media using a wavelet-based method: application to fault and subduction zones
Publisher: Oxford University Press (OUP)
Date: 08-2003
Subduction zone guided waves and the heterogeneity structure of the subducted plate: Intensity anomalies in northern Japan
Publisher: American Geophysical Union (AGU)
Date: 2005
DOI: 10.1029/2004JB003486
Steps in lithospheric thickness within eastern Australia, evidence from surface wave tomography
Publisher: American Geophysical Union (AGU)
Date: 08-2008
DOI: 10.1029/2007TC002116
Imaging changes in morphology, geometry, and physical properties of the subducting Pacific plate along the Izu–Bonin–Mariana arc
Publisher: Elsevier BV
Date: 08-2004
3D isochronal modelling of reflections from the deep crust: application to reflection profiling in central Australia
Publisher: Elsevier BV
Date: 02-1990
Generation of comprehensive ecosystems-specific reference databases with species-level resolution by high-throughput full-length 16S rRNA gene sequencing and automated taxonomy assignment (AutoTax)
Publisher: Cold Spring Harbor Laboratory
Date: 18-06-2019
DOI: 10.1101/672873
Abstract: High-throughput 16S rRNA gene licon sequencing is an essential method for studying the ersity and dynamics of microbial communities. However, this method is presently h ered by the lack of high-identity reference sequences for many environmental microbes in the public 16S rRNA gene reference databases, and by the absence of a systematic and comprehensive taxonomy for the uncultured majority. Here we demonstrate how high-throughput synthetic long-read sequencing can be applied to create ecosystem-specific full-length 16S rRNA gene licon sequence variant (FL-ASV) reference databases that include high-identity references ( .7% identity) for nearly all abundant bacteria ( .01% relative abundance) using Danish wastewater treatment systems and anaerobic digesters as an ex le. In addition, we introduce a novel sequence identity-based approach for automated taxonomy assignment (AutoTax) that provides a complete seven-rank taxonomy for all reference sequences, using the SILVA taxonomy as a backbone, with stable placeholder names for unclassified taxa. The FL-ASVs are perfectly suited for the evaluation of taxonomic resolution and bias associated with primers commonly used for licon sequencing, allowing researchers to choose those that are ideal for their ecosystem. The AutoTax taxonomy greatly improves the classification of short-read 16S rRNA gene licon sequence variants (ASVs) at the genus- and species-level, compared to the commonly used universal reference databases. Importantly, the placeholder names provide a way to explore the unclassified environmental taxa at different taxonomic ranks, which in combination with in situ analyses can be used to uncover their ecological roles.
Maximum depth of magnetisation of Australia, its uncertainty, and implications for Curie depth
Publisher: Elsevier BV
Date: 09-2015
The structure of the upper mantle beneath the Delamerian and Lachlan orogens from simultaneous inversion of multiple teleseismic datasets
Publisher: Elsevier BV
Date: 04-2011
The lithosphere‐asthenosphere transition and radial anisotropy beneath the Australian continent
Publisher: American Geophysical Union (AGU)
Date: 26-05-2015
DOI: 10.1002/2015GL063845
Reply to comment by A. Tommasi and D. Mainprice on Visser et al. (2008), “Probability of radial anisotropy in the deep mantle” [Earth Planet Sci. Lett. 270 (2008) 241–250]
Publisher: Elsevier BV
Date: 11-2008
Non-linear methods for event location in a global context
Publisher: Elsevier BV
Date: 09-2006
Variations in crustal structure across the transition from West to East Antarctica, Southern Victoria Land
Publisher: Oxford University Press (OUP)
Date: 12-2003
Stacking autocorrelograms to map Moho depth with high spatial resolution in southeastern Australia
Publisher: American Geophysical Union (AGU)
Date: 28-09-2015
DOI: 10.1002/2015GL065345
The Moho in Australia and New Zealand
Publisher: Elsevier BV
Date: 12-2013
Genetic algorithm inversion for receiver functions with application to crust and uppermost mantle structure beneath eastern Australia
Publisher: American Geophysical Union (AGU)
Date: 07-1996
DOI: 10.1029/96GL01671
Receiver structure from teleseisms: Autocorrelation and cross correlation
Publisher: American Geophysical Union (AGU)
Date: 28-06-2016
DOI: 10.1002/2016GL069564
Stress and faulting in southeast Australia as derived from the strongest earthquakes in the region
Publisher: Elsevier BV
Date: 02-2000
Non-linear waveform inversion for surface waves with a neighbourhood algorithm-application to multimode dispersion measurements
Publisher: Oxford University Press (OUP)
Date: 04-2002
Earth Structure, Major Divisions
Publisher: Springer Netherlands
Date: 2007
Regional DistancePLPhase in the Crustal Waveguide—An Analog to the TeleseismicWPhase in the Upper‐Mantle Waveguide
Publisher: American Geophysical Union (AGU)
Date: 05-2018
DOI: 10.1029/2018JB015717
Effects of the density perturbation in scattering
Publisher: American Geophysical Union (AGU)
Date: 07-2004
DOI: 10.1029/2004GL019933
The nature of Earth's correlation wavefield: late coda of large earthquakes
Publisher: The Royal Society
Date: 06-2018
Abstract: The seismic correlation wavefield constructed from the stacked cross-correlograms of the late coda of earthquake signals at stations across the globe provides a wealth of observed pulses as a function of inter-station distance. The interval from 3 to 10 h after the onset of major earthquakes is employed for the period range from 15 to 50 s. The observations can be well matched by synthetic seismograms for a radially stratified Earth. Many of the correlation phases have similar time behaviour to those in the regular wavefield, but others have no correspondence. All such correlation phases can be explained by the interaction of arrivals with a common slowness at the each of the stations being correlated. Using a generalized ray description of the seismic wavefield, the time-distance behaviour of these correlation phases arises from differences in accumulated phase on different propagation paths through the Earth. Distinct arrivals emerge from the correlation field when there are many ways in which combinations of seismic phases can arise with the same difference in propagation legs. The constituents of the late coda are dominated by steeply travelling waves, and in consequence features associated with multiple passages through the whole Earth emerge distinctly, such as high-order multiples of PKIKP .
Seismic Wave Propagation in Stratified Media
Publisher: ANU Press
Date: 05-2009
The Kitchen Table: Mother-Academics Reconfiguring Their Emerging Identities While Aligning Family and Work
Publisher: Springer Nature Singapore
Date: 2022
Full waveform tomography for radially anisotropic structure: New insights into present and past states of the Australasian upper mantle
Publisher: Elsevier BV
Date: 02-2010
Theoretical background for continental- and global-scale full-waveform inversion in the time-frequency domain
Publisher: Oxford University Press (OUP)
Date: 11-2008
Structure of the Mt Isa region from seismic ambient noise tomography
Publisher: Informa UK Limited
Date: 10-2013
Areal parameter estimates from multiple datasets
Publisher: California Digital Library (CDL)
Date: 12-02-2022
Abstract: A wide range of methods exist for interpolation between spatially distributed points drawn from a single population. Yet often multiple datasets are available with differing distribution, character and reliability. A simple scheme is introduced to allow the fusion of multiple datasets. Each dataset is assigned an a priori spatial influence zone around each point and a relative weight based on its physical character. The composite result at a specific location is a weighted combination of the spatial terms for all the available data points that make a significant contribution. It is therefore also useful for sparse observations that characterise a limited spatial zone, such as heat flow. The combination of multiple data sets is illustrated with the construction of a unified Moho surface in part of southern Australia from results exploiting a variety of different styles of analysis.
Intraplate seismic events off Sumatra: 3-D source evolution
Publisher: California Digital Library (CDL)
Date: 13-01-2013
The Significance of Long‐Period Ground Motion at Regional to Teleseismic Distances From the 610‐km DeepMw8.3 Sea of Okhotsk Earthquake of 24 May 2013
Publisher: American Geophysical Union (AGU)
Date: 08-2019
DOI: 10.1029/2019JB018147
Curriculum making as professionalism‐in‐context: the cases of two elementary school teachers amidst curriculum change in Cyprus
Publisher: Wiley
Date: 03-04-2018
Seismic structure of the crust and uppermost mantle of the Capricorn and Paterson Orogens and adjacent cratons, Western Australia, from passive seismic transects
Publisher: Elsevier BV
Date: 02-2012
Joint bulk-sound and shear tomography for Western Pacific subduction zones
Publisher: Elsevier BV
Date: 05-2003
Generation of Comprehensive Ecosystem-Specific Reference Databases with Species-Level Resolution by High-Throughput Full-Length 16S rRNA Gene Sequencing and Automated Taxonomy Assignment (AutoTax)
Publisher: American Society for Microbiology
Date: 27-10-2020
Abstract: High-throughput 16S rRNA gene licon sequencing is an essential method for studying the ersity and dynamics of microbial communities. However, this method is presently h ered by the lack of high-identity reference sequences for many environmental microbes in the public 16S rRNA gene reference databases and by the absence of a systematic and comprehensive taxonomy for the uncultured majority. Here, we demonstrate how high-throughput synthetic long-read sequencing can be applied to create ecosystem-specific full-length 16S rRNA gene licon sequence variant (FL-ASV) resolved reference databases that include high-identity references ( .
Anomalous surface waves associated with deep earthquakes, generated at an ocean ridge
Publisher: Oxford University Press (OUP)
Date: 09-1998
Reply to comment by S. Crampin on ‘Global anisotropic phase velocity maps for higher mode Love and Rayleigh waves’
Publisher: Oxford University Press (OUP)
Date: 04-2009
Seismic heterogeneity in the mantle—strong shear wave signature of slabs from joint tomography
Publisher: Elsevier BV
Date: 08-2004
The nature of the Moho in Australia from reflection profiling: A review
Publisher: Elsevier BV
Date: 03-2015
Stochastic features of scattering
Publisher: Elsevier BV
Date: 02-2005
High-frequency ground motion from Australian earthquakes
Publisher: Informa UK Limited
Date: 18-08-2017
The relationship of the seismic source and subduction zone structure for the 2004 December 26 Sumatra–Andaman earthquake
Publisher: Elsevier BV
Date: 10-2005
Steep reflections from the earth's core reveal small-scale heterogeneity in the upper mantle
Publisher: Elsevier BV
Date: 2010
Multistep modelling of receiver-based seismic and ambient noise data from WOMBAT array: crustal structure beneath southeast Australia
Publisher: Oxford University Press (OUP)
Date: 12-04-2012
On seismological reference models and the perceived nature of heterogeneity
Publisher: Elsevier BV
Date: 12-2006
Global anisotropic phase velocity maps for higher mode Love and Rayleigh waves
Publisher: Oxford University Press (OUP)
Date: 03-2008
Stochastic waveguide in the lithosphere: Indonesian subduction zone to Australian craton
Publisher: Oxford University Press (OUP)
Date: 2008
Insights into the structure of the upper mantle beneath the Murray Basin from 3D teleseismic tomography
Publisher: Informa UK Limited
Date: 08-2006
Next-generation seismic model of the Australian crust from synchronous and asynchronous ambient noise imaging
Publisher: Springer Science and Business Media LLC
Date: 02-03-2023
DOI: 10.1038/S41467-023-36514-Z
Abstract: The proliferation of seismic networks in Australia has laid the groundwork for high-resolution probing of the continental crust. Here we develop an updated 3D shear-velocity model using a large dataset containing nearly 30 years of seismic recordings from over 1600 stations. A recently-developed ambient noise imaging workflow enables improved data analysis by integrating asynchronous arrays across the continent. This model reveals fine-scale crustal structures at a lateral resolution of approximately 1-degree in most parts of the continent, highlighted by 1) shallow low velocities ( .2 km/s) well correlated with the locations of known sedimentary basins, 2) consistently faster velocities beneath discovered mineral deposits, suggesting a whole-crustal control on the mineral deposition process, and 3) distinctive crustal layering and improved characterization of depth and sharpness of the crust-mantle transition. Our model sheds light on undercover mineral exploration and inspires future multi-disciplinary studies for a more comprehensive understanding of the mineral systems in Australia.
Seismic wave attenuation beneath the Australasian region
Publisher: Informa UK Limited
Date: 04-2011
Consistency regions in non-linear inversion
Publisher: Oxford University Press (OUP)
Date: 05-2004
Literacies, Learning, and the Body
Publisher: Routledge
Date: 16-10-2015
Retrieval of Interstation Local Body Waves From Teleseismic Coda Correlations
Publisher: American Geophysical Union (AGU)
Date: 03-2019
DOI: 10.1029/2018JB016837
Anisotropy in the subducting slab: Observations from Philippine Sea plate events in Taiwan
Publisher: American Geophysical Union (AGU)
Date: 11-12-2015
DOI: 10.1002/2015GL066227
From padhana (पढ़ाना) to play pedagogy: a collaborative autoethnography of an immigrant early childhood educator
Publisher: Informa UK Limited
Date: 08-03-2022
Spatial and temporal evolution of the subducting Pacific plate structure along the western Pacific margin
Publisher: American Geophysical Union (AGU)
Date: 02-2006
DOI: 10.1029/2005JB003705
A low seismic wavespeed anomaly beneath northwestern India: a seismic signature of the Deccan plume?
Publisher: Elsevier BV
Date: 1999
High-frequency Po/So guided waves in the oceanic lithosphere: II—heterogeneity and attenuation
Publisher: Oxford University Press (OUP)
Date: 22-08-2014
DOI: 10.1093/GJI/GGU286
Tracking earthquake source evolution in 3-D
Publisher: Oxford University Press (OUP)
Date: 25-06-2014
DOI: 10.1093/GJI/GGU165
Earth's Correlation Wavefield: Late Coda Correlation
Publisher: American Geophysical Union (AGU)
Date: 13-04-2018
DOI: 10.1002/2018GL077244
Affective practice architectures of professional learning in international schools
Publisher: Informa UK Limited
Date: 03-2022
Crustal architecture of the Capricorn Orogen, Western Australia and associated metallogeny
Publisher: Informa UK Limited
Date: 10-2013
Optimal equations of state for mantle minerals from simultaneous non-linear inversion of multiple datasets
Publisher: Elsevier BV
Date: 09-2009
Significant P wave conversions from upgoing S waves generated by very deep earthquakes around Japan
Publisher: Springer Science and Business Media LLC
Date: 09-07-2019
Continental lithospheric layering beneath stable, modified, and destroyed cratons from seismic daylight imaging
Publisher: Wiley
Date: 31-10-2017
Contrasts in mantle structure beneath Australia: Relation to Tasman Lines?
Publisher: Wiley
Date: 08-2004
Tracking high-frequency seismic source evolution: 2004Mw8.1 Macquarie event
Publisher: American Geophysical Union (AGU)
Date: 22-02-2014
DOI: 10.1002/2013GL058935
Evolution of the correlation wavefield extracted from seismic event coda
Publisher: Elsevier BV
Date: 09-2018
Probabilistic surface reconstruction from multiple data sets: An example for the Australian Moho
Publisher: American Geophysical Union (AGU)
Date: 10-2012
DOI: 10.1029/2012JB009547
Lg-wave attenuation in the Australian crust
Publisher: Elsevier BV
Date: 10-2017
Unusual Strong Ground Motion Across Japan From the 680 km Deep 30 May 2015 Ogasawara Islands Earthquake
Publisher: American Geophysical Union (AGU)
Date: 10-2017
DOI: 10.1002/2017JB014519
Uppermost mantle P wavespeed structure beneath eastern China and its surroundings
Publisher: Elsevier BV
Date: 06-2016
Contrasts in lithospheric structure within the Australian craton—insights from surface wave tomography
Publisher: Elsevier BV
Date: 03-2005
Southwest Australia Seismic Network (SWAN): Recording Earthquakes in Australia’s Most Active Seismic Zone
Publisher: Seismological Society of America (SSA)
Date: 18-01-2023
DOI: 10.1785/0220220323
Abstract: The geological structure of southwest Australia comprises a rich, complex record of Precambrian cratonization and Phanerozoic continental breakup. Despite the stable continental cratonic geologic history, over the past five decades the southwest of Western Australia has been the most seismically active region in continental Australia, though the reason for this activity is not yet well understood. The Southwest Australia Seismic Network (SWAN) is a temporary broadband network of 27 stations that was designed to both record local earthquakes for seismic hazard applications and provide the opportunity to dramatically improve the rendering of 3D seismic structure in the crust and mantle lithosphere. Such seismic data are essential for better characterization of the location, depth, and attenuation of the regional earthquakes, and hence understanding of earthquake hazard. During the deployment of these 27 broadband instruments, a significant earthquake swarm occurred that included three earthquakes of local magnitude 4.0 and larger, and the network was supplemented by an additional six short-term nodal seismometers at 10 separate sites in early 2022, as a rapid deployment to monitor this swarm activity. The SWAN experiment has been continuously recording since late 2020 and will continue into 2023. These data are archived at the International Federation of Digital Seismograph Networks (FDSN) - recognized Australian Passive Seismic (AusPass) Data center under network code 2P and will be publicly available in 2025.
Determination of the influence zone for surface wave paths
Publisher: Oxford University Press (OUP)
Date: 05-2002
Role of lithosphere in intra-continental deformation: Central Australia
Publisher: Elsevier BV
Date: 11-2013
Developments in passive seismic techniques through the ANSIR National Research Facility
Publisher: Informa UK Limited
Date: 12-2006
DOI: 10.1071/EG06278
Teleseismic tomography of the upper mantle beneath the southern Lachlan Orogen, Australia
Publisher: Elsevier BV
Date: 03-2008
High-frequency waves guided by the subducted plates underneath Taiwan and their association with seismic intensity anomalies
Publisher: American Geophysical Union (AGU)
Date: 02-2013
DOI: 10.1002/JGRB.50071
Model-based velocity analysis
Publisher: Informa UK Limited
Date: 06-1997
DOI: 10.1071/EG997349
Full seismic waveform tomography for upper-mantle structure in the Australasian region using adjoint methods
Publisher: Oxford University Press (OUP)
Date: 12-2009
An integrated multi-scale 3D seismic model of the Archaean Yilgarn Craton, Australia
Publisher: Elsevier BV
Date: 06-2006
AuSREM: Australian Seismological Reference Model
Publisher: Informa UK Limited
Date: 12-2012
Distinctive seismic reflections from the subducting Pacific slab for earthquakes in the Ryukyu arc
Publisher: Oxford University Press (OUP)
Date: 24-12-2022
DOI: 10.1093/GJI/GGAC514
Abstract: During moderate to deep (35–260 km) earthquakes within the Philippine-sea slab along the Ryukyu arc, distinctive later phases after S are observed across the Japanese archipelago for epicentral distances from 1500 to 2200 km, producing anomalous lification of ground motion in central and northern Japan. Broad-band observations show that these later phases have a faster apparent wave speed (7–9.5 km s−1) than S, and are dominant at low frequencies (0.05–1 Hz), indicating S-wave reflections returned from the upper mantle with strong attenuation for high frequencies. Numerical simulation of seismic wave propagation in 3-D models including subduction of both the Pacific (PAC) and Philippine-sea (PHS) plates reveal the origin of these reflections. The triplicated S wave front from the 410 km discontinuity undergoes wide-angle reflection at the top of the Pacific slab bringing strong litudes in a narrow band of epicentral distance near 1500 km. Also, wide-angle S reflections at the 660 km discontinuity are reinforced by refraction when travelling through the high-wave speed Pacific slab these arrive at the surface beyond 2000 km epicentral distance. The characteristics of the deep mantle reflections and the distribution of large ground motion across Japan due to the reflections are strongly dependent on the source depth and distance to the Ryukyu earthquakes. Tomographic imagery for western Japan indicates loss of the high-wave speed signal of the PAC slab below 200 km depth the character of the large S reflections and pattern of enhanced ground motions favours a model in which the PAC slab is thinned rather than fully broken. The peculiar pattern of ground motion from Ryukyu earthquakes can be useful for constraining deep slab structures that are difficult to identify based on tomography.
Lithospheric structure of Tasmania from a novel form of teleseismic tomography
Publisher: American Geophysical Union (AGU)
Date: 02-2006
DOI: 10.1029/2005JB003803
The role of subjectivity for understanding collaborative dialogue and cultural productions of teachers in international schools
Publisher: Springer Singapore
Date: 12-12-2019
Boudinage of a stretching slablet implicated in earthquakes beneath the Hindu Kush
Publisher: Springer Science and Business Media LLC
Date: 24-02-2008
DOI: 10.1038/NGEO132
Rapid estimation of relative and absolute delay times across a network by adaptive stacking
Publisher: Oxford University Press (OUP)
Date: 04-2004
The apparently isotropic Australian upper mantle
Publisher: American Geophysical Union (AGU)
Date: 2006
DOI: 10.1029/2006GL026401
Seismic structure in the mantle beneath Australia
Publisher: Geological Society of America
Date: 2003
Towards constitutive equations for the deep Earth
Publisher: Elsevier BV
Date: 09-2017
Towards a more detailed seismic picture of the oceanic crust and mantle
Publisher: Springer Science and Business Media LLC
Date: 1977
DOI: 10.1007/BF00309792
Lithospheric structure of the Pilbara Craton, Capricorn Orogen and northern Yilgarn Craton, Western Australia, from teleseismic receiver functions
Publisher: Informa UK Limited
Date: 06-2003
Toward the reconciliation of seismological and petrological perspectives on oceanic lithosphere heterogeneity
Publisher: American Geophysical Union (AGU)
Date: 09-2015
DOI: 10.1002/2015GC006017
Tears or thinning? Subduction structures in the Pacific plate beneath the Japanese Islands
Publisher: Elsevier BV
Date: 05-2010
Imaging architecture of the Jakarta Basin, Indonesia with transdimensional inversion of seismic noise
Publisher: Oxford University Press (OUP)
Date: 15-12-2016
DOI: 10.1093/GJI/GGV466
Crustal structure of a Proterozoic craton boundary: East Albany-Fraser Orogen, Western Australia, imaged with passive seismic and gravity anomaly data
Publisher: Elsevier BV
Date: 07-2017
Refining the Moho across the Australian continent
Publisher: Oxford University Press (OUP)
Date: 28-01-2023
DOI: 10.1093/GJI/GGAD035
Abstract: In recent years, there has been a considerable expansion of deployments of portable seismic stations across Australia, which have been analysed by receiver function or autocorrelation methods to extract estimates of Moho depth. An ongoing program of full-crustal reflection profiles has now provided more than 25 000 km of reflection transects that have been interpreted for Moho structure. The Moho data set is further augmented by extensive marine reflection results. These new data sources have been combined with earlier refraction and receiver function results to provide full continental coverage, though some desert areas remain with limited s ling. The dense s ling of the Moho indicates the presence of rapid changes in Moho depth, and so, the Moho surface has been constructed using an approach that allows different weighting and spatial influence depending on the nature of the estimate. The inclusion of Moho results from continental-wide gravity inversion with low weighting helps to resolve the continent-ocean transition and to provide additional control in the least s led zones. The refined distribution indicates the presence of widespread smaller-scale variations in Moho structure. Strong lateral contrasts in crustal thickness remain, but some have become more subdued with improved s ling of critical areas. The main differences from earlier results lie in previously poorly s led regions around the Lake Eyre Basin, where additional passive seismic results indicate somewhat thicker crust though still with a strong contrast in crustal thickness to the cratonic zone to the west.
Transportable seismic array tomography in southeast Australia: Illuminating the transition from Proterozoic to Phanerozoic lithosphere
Publisher: Elsevier BV
Date: 02-2014
Lg wave propagation in the area around Japan: observations and simulations
Publisher: Springer Science and Business Media LLC
Date: 2014
Lithospheric discontinuities in Central Australia
Publisher: Elsevier BV
Date: 10-2018
100 years of seismic research on the Moho
Publisher: Elsevier BV
Date: 12-2013
Seismic Phases
Publisher: Springer Netherlands
Date: 2007
Plate reconstructions and tomography reveal a fossil lower mantle slab below the Tasman Sea
Publisher: Elsevier BV
Date: 02-2009
Heterogeneity within the subducting Pacific slab beneath the Izu–Bonin–Mariana arc: Evidence from tomography using 3D ray tracing inversion techniques
Publisher: Elsevier BV
Date: 30-06-2005
Australia's Moho: A test of the usefulness of gravity modelling for the determination of Moho depth
Publisher: Elsevier BV
Date: 12-2013
The seismic wavefield as seen by Distributed Acoustic Sensing (DAS) arrays: local, regional and teleseismic sources
Publisher: California Digital Library (CDL)
Date: 12-02-2022
DOI: 10.31223/X5132H
Abstract: Distributed acoustic sensing (DAS) exploiting fibre optic cables provides a means for high-density s ling of the seismic wavefield. The scattered returns from multiple laser pulses provide local averages of strain rate over a finite gauge length, and the nature of the signal depends on the orientation of the cable with respect to the passing seismic waves. The properties of the wavefield in the slowness-frequency domain help to provide understanding of the nature of DAS recordings. For local events the dominant part of the strain rate can be extracted from the difference of ground velocity resolved along the fibre at the ends of the gauge interval, with an additional contribution just near the source. For more distant events the response at seismic frequencies can be represented as the acceleration along the fibre modulated by the horizontal slowness resolved in the same direction, which means there is a strong dependence on cable orientation. These representations of the wavefield provide insight into the character of the DAS wavefield in a range of situations from a local jump source, through a regional earthquake to teleseismic recording with different cable configurations and geographic locations. The slowness domain representation of the DAS signal allows analysis of the array response of cable configurations indicating the important role of the slowness weighting associated with the effect of gauge length. Unlike seismometer arrays the response is not described by a single generic stacking function. For high frequency waves, direct stacking enhances P, SV waves and Rayleigh waves an azimuthal weighted stack provides retrieval of SH and Love waves at the cost of enhanced sidelobes in the array response.
A review of crust and upper mantle structure beneath the Indian subcontinent
Publisher: Elsevier BV
Date: 03-2015
Dynamic Earth: crustal and mantle heterogeneity
Publisher: Informa UK Limited
Date: 04-2008
Australian seismological referencemodel (AuSREM): Mantle component
Publisher: Oxford University Press (OUP)
Date: 05-12-2013
DOI: 10.1093/GJI/GGS065
Geophysical Continua
Publisher: Cambridge University Press
Date: 05-06-2008
Abstract: Geophysical Continua presents a systematic treatment of deformation in the Earth from seismic to geologic time scales, and demonstrates the linkages between different aspects of the Earth's interior that are often treated separately. A unified treatment of solids and fluids is developed to include thermodynamics and electrodynamics, in order to cover the full range of tools needed to understand the interior of the globe. The emphasis throughout the book is on relating seismological observations with interpretations of earth processes. Physical principles and mathematical descriptions are developed that can be applied to a broad spectrum of geodynamic problems. Incorporating illustrative ex les and an introduction to modern computational techniques, this textbook is designed for graduate-level courses in geophysics and geodynamics. It is also a useful reference for practising Earth Scientists.
Crustal properties from seismic station autocorrelograms
Publisher: Oxford University Press (OUP)
Date: 06-12-2013
DOI: 10.1093/GJI/GGS064
Refining the Moho across the Australian continent
Publisher: California Digital Library (CDL)
Date: 31-01-2023
DOI: 10.31223/X5S076
Abstract: In recent years there has been a considerable expansion of deployments of portable seismic stations across Australia, which have been analysed by receiver function or autocorrelation methods to extract estimates of Moho depth. An ongoing program of full-crustal reflection profiles has now provided more than 25,000 km of reflection transects that have been interpreted for Moho structure. The Moho dataset is further augmented by extensive marine reflection results. These new data sources have been combined with earlier refraction and receiver function results to provide full continental coverage, though some desert areas remain with limited s ling. The dense s ling of the Moho indicates the presence of rapid changes in Moho depth and so the Moho surface has been constructed using an approach that allows different weighting and spatial influence depending on the nature of the estimate. The inclusion of Moho results from continental-wide gravity inversion with low weighting helps to resolve the continent-ocean transition and to provide additional control in the least s led zones. The refined distribution indicates the presence of widespread smaller-scale variations in Moho structure. Strong lateral contrasts in crustal thickness remain, but some have become more subdued with improved s ling of critical areas. The main differences from earlier results lie in previously poorly s led regions around the Lake Eyre Basin, where additional passive seismic results indicate somewhat thicker crust though still with a strong contrast in crustal thickness to the cratonic zone to the west.
A 2.5-D time-domain elastodynamic equation for a general anisotropic medium
Publisher: Oxford University Press (OUP)
Date: 11-1996
Variations in Regional Phase Propagation in the Area around Japan
Publisher: Seismological Society of America (SSA)
Date: 08-2001
DOI: 10.1785/0120000270
Improving global shear wave traveltime tomography usingthree-dimensional ray tracing and iterative inversion
Publisher: Oxford University Press (OUP)
Date: 06-2000
On the observation of high frequency PKiKP and its coda in Australia
Publisher: Elsevier BV
Date: 09-2004
Local station correlation: large N-arrays and DAS
Publisher: McGill University Library and Archives
Date: 18-09-2023
The seismic wavefield as seen by distributed acoustic sensing arrays: local, regional and teleseismic sources
Publisher: The Royal Society
Date: 02-2022
Abstract: Distributed acoustic sensing (DAS) exploiting fibre optic cables provides high-density s ling of the seismic wavefield. Scattered returns from multiple laser pulses provide local averages of strain rate over a finite gauge length. The nature of the signal depends on the orientation of the cable with respect to the passing seismic waves. For local events, the dominant part of the strain rate can be extracted from the difference of ground velocity resolved along the fibre at the ends of the gauge interval. For more distant events the response at seismic frequencies can be represented as the acceleration along the fibre modulated by the wave slowness resolved in the same direction, which means there is a strong dependence on cable orientation. Slowness–frequency representations of the wavefield provide insight, via modelling, into the character of the DAS wavefield in a range of situations from a local jump source, through a regional earthquake to teleseismic recording. The slowness-domain representation of the DAS signal allows analysis of the array response of cable configurations indicating a bias due to the slowness weighting associated with the effect of gauge length. Unlike seismometer arrays the response is not described by a single generic stacking function.
Historicizing Teacher Education Curricula in the Middle-Ground: A Study of Four Cohorts of Elementary Teachers’ Life Hi/stories in the Republic of Cyprus (Late 1970s–2010s)
Publisher: Springer International Publishing
Date: 2023
Author Correction: Next-generation seismic model of the Australian crust from synchronous and asynchronous ambient noise imaging
Publisher: Springer Science and Business Media LLC
Date: 09-05-2023
Crustal complexity in the Lachlan Orogen revealed from teleseismic receiver functions
Publisher: Informa UK Limited
Date: 04-2013
Crustal Imaging With Bayesian Inversion of Teleseismic P Wave Coda Autocorrelation
Publisher: American Geophysical Union (AGU)
Date: 06-2019
DOI: 10.1029/2018JB017055
Scattering of elastic waves in media with a random distribution of fluid-filled cavities: theory and numerical modelling
Publisher: Oxford University Press (OUP)
Date: 12-2004
Origin of lateral heterogeneities in the upper mantle beneath South-East Australia from seismic tomography
Publisher: Springer International Publishing
Date: 2015
Interactions of multi-scale heterogeneity in the lithosphere: Australia
Publisher: Elsevier BV
Date: 10-2017
A review of the 2011 Tohoku-Oki earthquake (Mw 9.0): Large-scale rupture across heterogeneous plate coupling
Publisher: Elsevier BV
Date: 02-2013
Vietnamese teacher educators’ perceptions of silence during online English as a Foreign Language classes
Publisher: ASCEE Publications
Date: 10-07-2022
Abstract: Teacher educators in university English as foreign language (EFL) classrooms often emphasise verbal communication alongside teacher-student relationships, students’ emotions, and the classroom climate. These factors all contribute to either encourage or discourage students’ willingness to communicate verbally (Butler, 2011). Yet, an area with limited research is understanding the teachers' perspectives of students' silence during online learning throughout the COVID-19 pandemic. Utilising Redmond et al.’s (2018) conceptual model of cognitive, behavioural, and emotional engagement in online learning, we examine how three undergraduate EFL teacher educators in Vietnam interpret students’ silence while teaching EFL through online Zoom classes. Drawing on three in-depth semi-structured interviews (n=3 hours), findings indicated that silence was experienced by the teacher educators in different ways as a thinking/learning opportunity, an indication of teachers' uncertainty, and as conscious disengagement.
Source Depth and Mechanism Inversion at Teleseismic Distances Using a Neighborhood Algorithm
Publisher: Seismological Society of America (SSA)
Date: 12-2000
DOI: 10.1785/0120000020
Multichannel processing for airborne gamma‐ray spectrometry
Publisher: Society of Exploration Geophysicists
Date: 11-1998
DOI: 10.1190/1.1444491
Abstract: The conventional approach to the processing of airborne gamma‐ray spectrometric data is to first sum the observed spectra over three relatively broad energy windows. These three window count rates are then processed to obtain estimates of the potassium (K), uranium (U), and thorium (Th) elemental abundances. However, multichannel spectra contain additional information on the concentrations of K, U, and Th in the source, on the distance between the source and the detector, and on the relative contribution of atmospheric radon to the observed spectrum. This information can be extracted using multichannel processing procedures. The observed spectrum is considered as the sum of three terrestrial and three background component spectra, which are determined through suitable airborne and ground calibrations. The background components can be calculated independently and removed from the observed spectra. A parametric model based on a principal component analysis of the terrestrial components as functions of simulated detector height is then used to find the effective heights at which the K, U, and Th terrestrial components best fit the background‐corrected airborne data. The component spectra for these heights are then fitted to the background‐corrected observed spectra to obtain elemental count rates. The multichannel processing results in significant reductions in the fractional errors associated with the estimated elemental count rates. For three surveys processed using the new methodology, the average deviations of the K, U, and Th elemental count rates from the estimated mean elemental count rates at each observation point are reduced by 12.4%, 26.5 %, and 20.3 %, respectively, when compared with the conventional three‐channel method. This results in a better structural resolution of small anomalies in enhanced images of the processed data.
Three-dimensional seismic structure beneath the Australasian region from refracted wave observations
Publisher: Oxford University Press (OUP)
Date: 09-2000
Sedimentary and upper crustal structure of Australia from receiver functions
Publisher: Informa UK Limited
Date: 04-2000
Transformative pedagogy: Dinka playgroups as spaces for cultural knowledge productions of Western science
Publisher: Springer Science and Business Media LLC
Date: 15-05-2019
Flexible computation of teleseismic synthetics for source and structural studies
Publisher: Oxford University Press (OUP)
Date: 12-2000
Caught between worlds of expertise: Elementary teachers amidst official curriculum development processes in Cyprus
Publisher: Informa UK Limited
Date: 07-02-2017
Probability of radial anisotropy in the deep mantle
Publisher: Elsevier BV
Date: 06-2008
On the nature of regional seismic phases-III. The influence of crustal heterogeneity on the wavefield for subduction earthquakes: the 1985 Michoacan and 1995 Copala, Guerrero, Mexico earthquakes
Publisher: Oxford University Press (OUP)
Date: 12-1998
Comparison of crustal and upper mantle heterogeneity in different time periods: Indonesian subduction zone to northern Australia
Publisher: Elsevier BV
Date: 17-01-2014
On the inner-outer core density contrast from PKiKP/PcP amplitude ratios and uncertainties caused by seismic noise
Publisher: Oxford University Press (OUP)
Date: 10-2009
Morphology of the distorted subducted Pacific slab beneath the Hokkaido corner, Japan
Publisher: Elsevier BV
Date: 06-2006
Three-dimensional visualization of a near-vertical slab tear beneath the southern Mariana arc
Publisher: American Geophysical Union (AGU)
Date: 06-2006
DOI: 10.1029/2005GC001110
Continental scale shear wave splitting analysis: Investigation of seismic anisotropy underneath the Australian continent
Publisher: Elsevier BV
Date: 07-2005
Chapter 7 A Scattering Waveguide in the Heterogeneous Subducting Plate
Publisher: Elsevier
Date: 2008
Spiral‐Arm Seismic Arrays
Publisher: Seismological Society of America (SSA)
Date: 07-07-2015
DOI: 10.1785/0120140354
Can autonomy be imposed? Examining teacher (re)positioning during the ongoing curriculum change in Cyprus
Publisher: Informa UK Limited
Date: 11-12-2013
Reflection seismograms in a 3-D elastic model: an isochronal approach
Publisher: Oxford University Press (OUP)
Date: 10-1989
Seismological insights into heterogeneity patterns in the mantle
Publisher: American Geophysical Union
Date: 2004
DOI: 10.1029/150GM05
Uppermost mantle structure beneath eastern China and its surroundings from Pn and Sn tomography
Publisher: American Geophysical Union (AGU)
Date: 04-04-2016
DOI: 10.1002/2016GL068618
Lithospheric Structure in the Australian Region - A Synthesis of Surface Wave and Body Wave Studies
Publisher: Informa UK Limited
Date: 12-2004
DOI: 10.1071/EG04242
Core structure and heterogeneity: a seismological perspective∗
Publisher: Informa UK Limited
Date: 06-2008
Multi-component autoregressive techniques for the analysis of seismograms
Publisher: Elsevier BV
Date: 06-1999
Two-dimensional inversion of refraction traveltimes by progressive model development
Publisher: Oxford University Press (OUP)
Date: 03-2000
Phase indentification and attribute analysis of broadband seismograms at far-regional distances
Publisher: Springer Science and Business Media LLC
Date: 2001
Studies of the Earth's Deep Interior—Eighth Symposium
Publisher: Elsevier BV
Date: 11-2005
Planning and Managing Scientific Research: A guide for the beginning researcher
Publisher: ANU Press
Date: 24-03-2014
A 2.5-D Time-Domain Elastodynamic Equation For Plane-Wave Incidence
Publisher: Oxford University Press (OUP)
Date: 05-1996
Separating intrinsic and apparent anisotropy
Publisher: Elsevier BV
Date: 06-2013
Practical Earthquake Location on a Continental Scale in Australia Using the AuSREM 3D Velocity Model
Publisher: Seismological Society of America (SSA)
Date: 21-10-2014
DOI: 10.1785/0120140105
Imaging crustal structure variation across southeastern Australia
Publisher: Elsevier BV
Date: 2013
NW Australian intraplate seismicity and stress regime
Publisher: American Geophysical Union (AGU)
Date: 03-10-2009
DOI: 10.1029/2008JB006152
Global azimuthal seismic anisotropy and the unique plate-motion deformation of Australia
Publisher: Springer Science and Business Media LLC
Date: 02-2005
DOI: 10.1038/NATURE03247
Abstract: Differences in the thickness of the high-velocity lid underlying continents as imaged by seismic tomography, have fuelled a long debate on the origin of the 'roots' of continents. Some of these differences may be reconciled by observations of radial anisotropy between 250 and 300 km depth, with horizontally polarized shear waves travelling faster than vertically polarized ones. This azimuthally averaged anisotropy could arise from present-day deformation at the base of the plate, as has been found for shallower depths beneath ocean basins. Such deformation would also produce significant azimuthal variation, owing to the preferred alignment of highly anisotropic minerals. Here we report global observations of surface-wave azimuthal anisotropy, which indicate that only the continental portion of the Australian plate displays significant azimuthal anisotropy and strong correlation with present-day plate motion in the depth range 175-300 km. Beneath other continents, azimuthal anisotropy is only weakly correlated with plate motion and its depth location is similar to that found beneath oceans. We infer that the fast-moving Australian plate contains the only continental region with a sufficiently large deformation at its base to be transformed into azimuthal anisotropy. Simple shear leading to anisotropy with a plunging axis of symmetry may explain the smaller azimuthal anisotropy beneath other continents.
Frequency dependence of seismic wave attenuation in the upper mantle beneath the Australian region
Publisher: Oxford University Press (OUP)
Date: 07-2002
The Australian Continent: A Geophysical Synthesis
Publisher: ANU Press
Date: 27-08-2018
DOI: 10.22459/AC.08.2018
Comparison of Location Procedures: The Kara Sea Event of 16 August 1997
Publisher: Seismological Society of America (SSA)
Date: 04-2007
DOI: 10.1785/0120040017
Crustal structure of Australia from ambient seismic noise tomography
Publisher: American Geophysical Union (AGU)
Date: 2012
DOI: 10.1029/2011JB008403
Determining the role of genetic risk scores in symptomatic cancer detection
Publisher: Royal College of General Practitioners
Date: 23-02-2023
Lithosphere–asthenosphere P-wave reflectivity across Australia
Publisher: Elsevier BV
Date: 12-2015
85.10 Synthetic seismogram calculation using the reflectivity method
Publisher: Elsevier
Date: 2003
Multiscale seismic heterogeneity in the continental lithosphere
Publisher: American Geophysical Union (AGU)
Date: 03-2016
DOI: 10.1002/2015GC006200
Inter-professional collaboration: building relational understanding
Publisher: Informa UK Limited
Date: 25-04-2022
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