ORCID Profile
0000-0002-6977-291X
Current Organisation
University of Cambridge
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
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 | Seismology and Seismic Exploration | Earthquake Seismology | Geodynamics | Tectonics | Geotectonics | Geology | Basin Analysis | Structural Geology | Geophysics Not Elsewhere Classified | Geophysics not elsewhere classified | Ore Deposit Petrology | Earth Sciences Not Elsewhere Classified | Exploration Geochemistry | Geomorphology and Regolith and Landscape Evolution | Marine Geoscience | Structural Geology | Geochronology | Explosion Seismology | Differential, Difference And Integral Equations | Ocean Engineering | Volcanology
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in the Earth Sciences | Earth sciences | Mineral Exploration not elsewhere classified | Oil and Gas Exploration | Natural Hazards not elsewhere classified | Oil and gas | Geothermal Exploration | Management of Greenhouse Gas Emissions from Electricity Generation | Geothermal Energy | Natural Hazards in Coastal and Estuarine Environments | Natural Hazards in Antarctic and Sub-Antarctic Environments | Renewable energy not elsewhere classified (e.g. geothermal) | Precious (Noble) Metal Ore Exploration | Expanding Knowledge in the Information and Computing Sciences | Titanium Minerals, Zircon, and Rare Earth Metal Ore (e.g. Monazite) Exploration | Copper Ore Exploration |
Related Links
Publications
Lithospheric controls on magma composition along Earth’s longest continental hotspot track
Publisher: Springer Science and Business Media LLC
Date: 09-2015
DOI: 10.1038/NATURE14903
Abstract: Hotspots are anomalous regions of volcanism at Earth's surface that show no obvious association with tectonic plate boundaries. Classic ex les include the Hawaiian-Emperor chain and the Yellowstone-Snake River Plain province. The majority are believed to form as Earth's tectonic plates move over long-lived mantle plumes: buoyant upwellings that bring hot material from Earth's deep mantle to its surface. It has long been recognized that lithospheric thickness limits the rise height of plumes and, thereby, their minimum melting pressure. It should, therefore, have a controlling influence on the geochemistry of plume-related magmas, although unambiguous evidence of this has, so far, been lacking. Here we integrate observational constraints from surface geology, geochronology, plate-motion reconstructions, geochemistry and seismology to ascertain plume melting depths beneath Earth's longest continental hotspot track, a 2,000-kilometre-long track in eastern Australia that displays a record of volcanic activity between 33 and 9 million years ago, which we call the Cosgrove track. Our analyses highlight a strong correlation between lithospheric thickness and magma composition along this track, with: (1) standard basaltic compositions in regions where lithospheric thickness is less than 110 kilometres (2) volcanic gaps in regions where lithospheric thickness exceeds 150 kilometres and (3) low-volume, leucitite-bearing volcanism in regions of intermediate lithospheric thickness. Trace-element concentrations from s les along this track support the notion that these compositional variations result from different degrees of partial melting, which is controlled by the thickness of overlying lithosphere. Our results place the first observational constraints on the sub-continental melting depth of mantle plumes and provide direct evidence that lithospheric thickness has a dominant influence on the volume and chemical composition of plume-derived magmas.
Seismic Tomography and the Assessment of Uncertainty
Publisher: Elsevier
Date: 2014
SASSY21: A 3-D seismic structural model of the lithosphere and underlying mantle beneath Southeast Asia from multi-scale adjoint waveform tomography
Publisher: Wiley
Date: 18-08-2021
Seismic wavefront tracking in 3D heterogeneous media: Applications with multiple data classes
Publisher: Informa UK Limited
Date: 12-2006
DOI: 10.1071/EG06322
Contrasts in mantle structure beneath Australia: Relation to Tasman Lines?
Publisher: Wiley
Date: 08-2004
Frontiers of seismology
Publisher: Oxford University Press (OUP)
Date: 08-2020
Abstract: Anton Ziolkowski and fellow organizers look back at the British Seismology Meeting 2019, which discussed events of all scales as well as new hardware and software techniques.
Crust and upper mantle structure beneath southeast Australia from ambient noise and teleseismic tomography
Publisher: Elsevier BV
Date: 10-2016
Seismic tomography of the North Anatolian Fault: New insights into structural heterogeneity along a continental strike‐slip fault
Publisher: American Geophysical Union (AGU)
Date: 11-03-2017
DOI: 10.1002/2017GL072726
Crustal Deformation and Fault Strength of the Sulawesi Subduction Zone
Publisher: American Geophysical Union (AGU)
Date: 03-2021
DOI: 10.1029/2020TC006573
Precambrian Plate Tectonics in Northern Hudson Bay: Evidence FromPandSWave Seismic Tomography and Analysis of Source Side Effects in Relative Arrival-Time Data Sets
Publisher: American Geophysical Union (AGU)
Date: 07-2018
DOI: 10.1029/2018JB015473
Seismic Tomography with Irregular Meshes
Publisher: American Geophysical Union
Date: 2013
DOI: 10.1029/157GM04
Earth's deepest earthquake swarms track fluid ascent beneath nascent arc volcanoes
Publisher: Elsevier BV
Date: 09-2019
Structure of the Tasmanian lithosphere from 3D seismic tomography
Publisher: Informa UK Limited
Date: 06-2010
Detailed seismic imaging of Merapi volcano, Indonesia, from local earthquake travel-time tomography
Publisher: Elsevier BV
Date: 06-2019
Upper mantle structure of the northeastern Arabian Platform from teleseismic body-wave tomography
Publisher: Elsevier BV
Date: 10-2020
New insight into Cainozoic sedimentary basins and Palaeozoic suture zones in southeast Australia from ambient noise surface wave tomography
Publisher: American Geophysical Union (AGU)
Date: 04-2010
DOI: 10.1029/2009GL041974
Multiarrival wavefront tracking and its applications
Publisher: American Geophysical Union (AGU)
Date: 11-2008
DOI: 10.1029/2008GC002069
Teleseismic tomography of the upper mantle beneath the southern Lachlan Orogen, Australia
Publisher: Elsevier BV
Date: 03-2008
A practical grid-based method for tracking multiple refraction and reflection phases in three-dimensional heterogeneous media
Publisher: Oxford University Press (OUP)
Date: 10-2006
The fast marching method: An effective tool for tomographic imaging and tracking multiple phases in complex layered media
Publisher: Informa UK Limited
Date: 12-2005
DOI: 10.1071/EG05341
Linking the upper crust to the upper mantle: Comparison of teleseismic tomography with long-wavelength features of the gravity and magnetic fields of southeastern Australia
Publisher: Informa UK Limited
Date: 06-2010
DOI: 10.1071/EG09024
Insights into the structure and dynamics of the upper mantle beneath Bass Strait, southeast Australia, using shear wave splitting
Publisher: Elsevier BV
Date: 04-2019
SASSIER22: Full-waveform tomography of the eastern Indonesian region that includes surface topography and the fluid ocean
Publisher: Wiley
Date: 08-06-2022
Matched Field Processing of Three‐Component Seismic Array Data Applied to Rayleigh and Love Microseisms
Publisher: American Geophysical Union (AGU)
Date: 08-2018
DOI: 10.1029/2018JB015526
Collision‐Induced Subduction Polarity Reversal Explains the Crustal Structure of Northern Borneo: New Results From Virtual Deep Seismic Sounding (VDSS)
Publisher: American Geophysical Union (AGU)
Date: 11-10-2022
DOI: 10.1029/2022GL099123
Abstract: Subduction polarity reversal (SPR) is a key subduction initiation mechanism often associated with arc‐continent collision zones. Northern Borneo has long been recognized as a location where sequential but opposing subduction zones were present in the Miocene, but has not been examined in the context of SPR. Here, we exploit teleseismic data from northern Borneo to investigate crustal thickness variations using Virtual Deep Seismic Sounding (VDSS). Our results reveal a thick crustal root beneath the Crocker Range and an area of relatively thin crust in the southeast, which appears to extend northeast into the Sulu Sea, where back‐arc rifting behind the younger subduction zone developed. Overall, our findings are consistent with predictions from numerical models of SPR involving arc‐continent collision, but with several important differences—including a substantial mountain range and more limited back‐arc rifting that can be attributed to northern Borneo being an ex le of SPR involving continent‐continent collision.
Seismic tomography: A window into deep Earth
Publisher: Elsevier BV
Date: 02-2010
Inherited crustal deformation along the East Gondwana margin revealed by seismic anisotropy tomography
Publisher: American Geophysical Union (AGU)
Date: 15-12-2016
DOI: 10.1002/2016GL071201
Lithospheric structure of Tasmania from a novel form of teleseismic tomography
Publisher: American Geophysical Union (AGU)
Date: 02-2006
DOI: 10.1029/2005JB003803
Transdimensional tomography with unknown data noise
Publisher: Oxford University Press (OUP)
Date: 06-2012
DOI: 10.1111/J.1365-246X.2012.05414.X
Abstract: A meaningful interpretation of seismic measurements requires a rigorous quantification of the uncertainty. In an inverse problem, the data noise determines how accurately observations should be fit, and ultimately the level of detail contained in the recovered model. A common problem in seismic tomography is the difficulty in quantifying data uncertainties, and thus the required level of data fit. Traditionally, the complexity of the solution model (defined by both the number of basis functions and the regularization) is defined arbitrarily by the user prior to inversion with only limited use of data errors. In the context of multiscale problems, dealing with multiple data sets that are characterized by different noise variances and that span the Earth at different scales is a major challenge. Practitioners are usually required to arbitrarily weigh the contribution of each data type into the final solution. Furthermore, the basis functions are usually spatially uniform across the velocity field and regularization procedures are global, which prevents the solution model from accounting for the uneven spatial distribution of information. In this work we propose to address these issues with a Hierarchical Bayesian inversion. The new algorithm represents an extension of the transdimensional tomography to account for uncertainties in data noise. This approach has the advantage of treating the level of noise in each data set, as well as the number of model parameters, as unknowns in the inversion. It provides a parsimonious solution that fully represents the degree of knowledge one has about seismic structure (i.e. constraints, resolution and trade-offs). Rather than being forced to make decisions on parametrization, level of data fit and weights between data types in advance, as is often the case in an optimization framework, these choices are relaxed and instead constrained by the data themselves. The new methodology is presented in a synthetic ex le where both the data density and the underlying structure contain multiple length scales. Three ambient noise data sets that span the Australian continent at different scales are then simultaneously inverted to infer a multiscale tomographic image of Rayleigh wave group velocity for the Australian continent. The procedure turns out to be particularly useful when dealing with multiple data types with different unknown levels of noise as the algorithm is able to naturally adjust the fit to the different data sets and provide a velocity map with a spatial resolution adapted to the spatially variable information present in the data.
Evidence of micro-continent entrainment during crustal accretion
Publisher: Springer Science and Business Media LLC
Date: 03-02-2015
DOI: 10.1038/SREP08218
Rapid estimation of relative and absolute delay times across a network by adaptive stacking
Publisher: Oxford University Press (OUP)
Date: 04-2004
P and S wave travel time tomography of the SE Asia-Australia collision zone
Publisher: Elsevier BV
Date: 08-2019
Exploiting seismic signal and noise in an intracratonic environment to constrain crustal structure and source parameters of infrequent earthquakes
Publisher: Oxford University Press (OUP)
Date: 16-01-2012
Linking mainland Australia and Tasmania using ambient seismic noise tomography: Implications for the tectonic evolution of the east Gondwana margin
Publisher: Elsevier BV
Date: 10-2015
High-frequency ambient noise tomography of southeast Australia: New constraints on Tasmania's tectonic past
Publisher: American Geophysical Union (AGU)
Date: 07-2011
DOI: 10.1029/2011GL047971
SASSY21: A 3‐D Seismic Structural Model of the Lithosphere and Underlying Mantle Beneath Southeast Asia From Multi‐Scale Adjoint Waveform Tomography
Publisher: American Geophysical Union (AGU)
Date: 03-2022
DOI: 10.1029/2021JB022930
Abstract: We present the first continental‐scale seismic model of the lithosphere and underlying mantle beneath Southeast Asia obtained from adjoint waveform tomography (often referred to as full‐waveform inversion or FWI), using seismic data filtered at periods from 20 to 150 s. Based on ,000 hr of analyzed waveform data gathered from ∼13,000 unique source‐receiver pairs, we image isotropic P ‐wave velocity, radially anisotropic S ‐wave velocity and density via an iterative non‐linear inversion that begins from a 1‐D reference model. At each iteration, the full 3‐D wavefield is determined through an anelastic Earth, accommodating effects of topography, bathymetry and ocean load. Our data selection aims to maximize sensitivity to deep structure by accounting for body wave arrivals separately. SASSY21 , our final model after 87 iterations across seven period bands, is able to explain true‐ litude data from events and receivers not included in the inversion. The trade‐off between inversion parameters is estimated through an analysis of the Hessian‐vector product. SASSY21 reveals detailed anomalies down to the mantle transition zone, including multiple subduction zones. The most prominent feature is the (Indo‐)Australian plate descending beneath Indonesia, which is imaged as one continuous slab along the 180° curvature of the Banda Arc. The tomography confirms the existence of a hole in the slab beneath Mount Tambora and locates a high S ‐wave velocity zone beneath northern Borneo that may be associated with subduction termination in the mid‐late Miocene. A previously undiscovered feature beneath the east coast of Borneo is also revealed, which may be a signature of post‐subduction processes, delamination or underthrusting from the formation of Sulawesi.
On the Origin of Seismic Anisotropy in the Shallow Crust of the Northern Volcanic Zone, Iceland
Publisher: American Geophysical Union (AGU)
Date: 2022
DOI: 10.1029/2021JB022655
Abstract: The Icelandic crust is a product of its unique tectonic setting, where the interaction of an ascending mantle plume and the Mid‐Atlantic Ridge has caused elevated mantle melting, with the melt accreted and cooled in the crust to form an oceanic plateau. We investigate the strength and orientation of seismic anisotropy in the upper crust of the Northern Volcanic Zone using local earthquake shear‐wave splitting, with a view to understanding how the contemporary stress field may influence sub‐wavelength structure and processes. This is achieved using a data set comprising 50,000 earthquakes located in the top 10 km of the crust, recorded by up to 70 stations over a 9 year period. We find that anisotropy is largely confined to the top 3–4 km of the crust, with an average delay time of 0.10 ± 0.05 s, and an average orientation of the fast axis of anisotropy of N014°E ± 27°, which is perpendicular to the spreading direction of the Eurasian and North American plates (N106°E). These results are consistent with the presence of rift‐parallel cracks that gradually close with depth, the preferential opening of which is controlled by the regional stress field. Lateral variations in the strength of shear wave anisotropy (SWA) reveal that regions with the highest concentrations of earthquakes have the highest SWA values (∼10%), which reflects the presence of significant brittle deformation. Disruption of the orientation of the fast axis of anisotropy around Askja volcano can be related to local stress changes caused by underlying magmatic processes.
Structure of the crust and upper mantle beneath Bass Strait, southeast Australia, from teleseismic body wave tomography
Publisher: Elsevier BV
Date: 09-2019
Seismic Tomography of Nabro Caldera, Eritrea: Insights Into the Magmatic and Hydrothermal Systems of a Recently Erupted Volcano
Publisher: American Geophysical Union (AGU)
Date: 05-2023
DOI: 10.1029/2022JB025742
Abstract: Understanding the crustal structure and the storage and movement of fluids beneath a volcano is necessary for characterizing volcanic hazard, geothermal prospects and potential mineral resources. This study uses local earthquake traveltime tomography to image the seismic velocity structure beneath Nabro, an off‐rift volcano located within the central part of the Danakil microplate near the Ethiopia‐Eritrea border. Nabro underwent its first historically documented eruption in June 2011, thereby providing an opportunity to analyze its post‐eruptive state by mapping subsurface fluid distributions. We use a catalog of earthquakes detected on a temporary seismic array using machine learning methods to simultaneously relocate the seismicity and invert for the three‐dimensional P‐ and S‐wave velocity structures ( V P , V S ) and the ratio between them ( V P / V S ). Overall, our model shows higher than average P‐ and S‐wave velocities, suggesting the presence of high‐strength, solidified intrusive magmatic rocks in the crust. We identify an aseismic region of low V P , low V S , and high V P / V S ratio at depths of 6–10 km b.s.l., interpreted as the primary melt storage region that fed the 2011 eruption. Above this is a zone of high V S , low V P , and low V P / V S ratio, representing an intrusive complex of fractured rocks partially saturated with over‐pressurized gases. Our observations identify the persistence of magma in the subsurface following the eruption, and track the degassing of this melt through the crust to the surface. The presence of volatiles and high temperatures within the shallow crust indicate that Nabro is a viable candidate for geothermal exploration.
Crustal structure of the Newer Volcanics Province, SE Australia, from ambient noise tomography
Publisher: Elsevier BV
Date: 06-2016
Direct Inversion of S ‐ P Differential Arrival Times for Ratio in SE Asia
Publisher: American Geophysical Union (AGU)
Date: 05-2020
DOI: 10.1029/2019JB019152
Transportable seismic array tomography in southeast Australia: Illuminating the transition from Proterozoic to Phanerozoic lithosphere
Publisher: Elsevier BV
Date: 02-2014
The Signature of Lithospheric Anisotropy at Post‐Subduction Continental Margins: New Insight From XKS Splitting Analysis in Northern Borneo
Publisher: American Geophysical Union (AGU)
Date: 11-2022
DOI: 10.1029/2022GC010564
Abstract: The relative paucity of recent post‐ subduction environments globally has meant that, so far, little is known about tectonic processes that occur during and after subduction termination, as previously convergent tectonic plates adjust to the new stress regime. The region of Southeast Asia that now encompasses northern Borneo has been host to two sequential episodes of subduction—both now terminated—since the mid‐Paleogene. It is expected that these processes will have left signatures in the fabric of the upper mantle, which are manifest in the form of seismic anisotropy. We investigate the evidence for, and alignment of, anisotropic fabrics by measuring the splitting of a family of teleseismic shear phases. These observations provide a measure of the orientation of the effective anisotropic elastic tensor, in the form of the orientation of the fast shear‐wave polarization, ϕ, and add constraints on the strength of the anisotropic fabric, in the form of the delay time, δt . We observe two principal trends across northern Borneo that appear to be confined to the lithosphere. These patterns are likely related to tectonic processes associated with subduction, continental collision, and oceanic basin formation, events that can exert primary influence on the formation of post‐subduction settings.
Convergent plate margin dynamics: New perspectives from structural geology, geophysics and geodynamic modelling
Publisher: Elsevier BV
Date: 03-2010
Transdimensional inversion of receiver functions and surface wave dispersion
Publisher: American Geophysical Union (AGU)
Date: 02-2012
DOI: 10.1029/2011JB008560
Multipathing, reciprocal traveltime fields and raylets
Publisher: Oxford University Press (OUP)
Date: 03-2010
Phase space methods for multi-arrival wavefronts
Publisher: Informa UK Limited
Date: 12-2006
DOI: 10.1071/EG06331
Ambient noise tomography reveals basalt and sub-basalt velocity structure beneath the Faroe Islands, North Atlantic
Publisher: Elsevier BV
Date: 11-2017
SASSIER22: Full‐Waveform Tomography of the Eastern Indonesian Region That Includes Topography, Bathymetry, and the Fluid Ocean
Publisher: American Geophysical Union (AGU)
Date: 28-10-2022
DOI: 10.1029/2022GC010563
Abstract: We present a new 3‐D seismic structural model of the eastern Indonesian region and its surroundings from full‐waveform inversion (FWI) that exploits seismic data filtered at periods between 15–150 s. SASSY21 —a recent 3‐D FWI tomographic model of Southeast Asia—is used as a starting model, and our study region is characterized by particularly good data coverage, which facilitates a more refined image. We use the spectral‐element solver Salvus to determine the full 3‐D wavefield, accounting for the fluid ocean explicitly by solving a coupled system of acoustic and elastic wave equations. This is computationally more expensive but allows seismic waves within the water layer to be simulated, which becomes important for periods ≤20 s. We investigate path‐dependent effects of surface elevation (topography and bathymetry) and the fluid ocean on synthetic waveforms, and compare our final model to the tomographic result obtained with the frequently used ocean loading approximation. Furthermore, we highlight some of the key features of our final model— SASSIER22 —after 34 L‐BFGS iterations, which reveals detailed anomalies down to the mantle transition zone, including a convergent double‐subduction zone along the southern segment of the Philippine Trench, which was not evident in the starting model. A more detailed illumination of the slab beneath the North Sulawesi Trench reveals a pronounced positive wavespeed anomaly down to 200 km depth, consistent with the maximum depth of seismicity, and a more diffuse but aseismic positive wavespeed anomaly that continues to the 410 km discontinuity.
Inversion of seismic refraction and wide-angle reflection traveltimes for three-dimensional layered crustal structure
Publisher: Oxford University Press (OUP)
Date: 05-2001
Seismic imaging at the cross-roads: Active, passive, exploration and solid Earth
Publisher: Elsevier BV
Date: 10-2017
Complex continental growth along the proto-Pacific margin of East Gondwana
Publisher: Geological Society of America
Date: 09-2014
DOI: 10.1130/G35766.1
Post-subduction tectonics induced by extension from a lithospheric drip
Publisher: Springer Science and Business Media LLC
Date: 19-06-2023
The mechanisms underpinning Cenozoic intraplate volcanism in eastern Australia: Insights from seismic tomography and geodynamic modeling
Publisher: American Geophysical Union (AGU)
Date: 13-10-2017
DOI: 10.1002/2017GL074911
Global correlations between maximum magnitudes of subduction zone interface thrust earthquakes and physical parameters of subduction zones
Publisher: Elsevier BV
Date: 12-2013
3-D structure of the Australian lithosphere from evolving seismic datasets
Publisher: Informa UK Limited
Date: 08-2012
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 Kalaotoa Fault: A Newly Identified Fault that Generated the Mw 7.3 Flores Sea Earthquake
Publisher: Seismological Society of America (SSA)
Date: 07-2022
DOI: 10.1785/0320220015
Abstract: We reveal the existence of a previously unknown fault that generated the Mw 7.3 Flores Sea earthquake, which occurred on 14 December 2021, approximately 100 km to the north of Flores Island, in one of the most complex tectonic settings in Indonesia. We use a double-difference method to relocate the hypocenters of the mainshock and aftershocks, determine focal mechanisms using waveform inversion, and then analyze stress changes to estimate the fault type and stress transfer. Our relocated hypocenters show that this earthquake sequence ruptured on at least three segments: the source mechanism of the mainshock exhibits dextral strike-slip motion (strike N72°W and dip 78° NE) on a west–east-trending fault that we call the Kalaotoa fault, whereas rupture of the other two segments located to the west and east of the mainshock (striking west-northwest and southeast, respectively) may have been triggered by this earthquake. The Coulomb stress change imparted by the rupture of these segments on nearby faults is investigated, with a focus on regions that experience a stress increase with few associated aftershocks. Of particular interest are stress increases on the central back-arc thrust just north of Flores and the north–south-striking Selayar fault in the northwest of our study region, both of which may be at increased risk of failure as a result of this unusual earthquake sequence.
Seismic tomography with irregular meshes
Publisher: American Geophysical Union
Date: 18-03-2005
DOI: 10.1029/156GM04
Crustal structure of northern Borneo from VDSS: Implications for subduction termination and the tectonic reconstruction of SE Asia
Publisher: Wiley
Date: 15-03-2022
Analysis of the 2021 Semangko Bay Earthquake Sequence in Southern Sumatra, Indonesia, Using Broadband Seismic Network Data
Publisher: Seismological Society of America (SSA)
Date: 09-02-2022
DOI: 10.1785/0220210304
Abstract: Beginning on 30 June 2021, hundreds of earthquakes were detected beneath Semangko Bay in southernmost Sumatra, which is located adjacent to the Sunda Strait, a narrow sea passage that separates the islands of Java and Sumatra. A number of these earthquakes were large enough to be felt by people living in the city of L ung, some 100 km to the east. In terms of magnitude and temporal distribution, the earthquakes did not follow a typical mainshock–aftershock sequence because the onset was marked by a cluster of five earthquakes with local magnitudes that ranged between 4.2 and 4.6, followed by a rapid decay in the number of detected events. We have relocated 254 of the 258 earthquakes that were recorded between 30 June and 14 July 2021, with a local magnitude range between ML 0.9 and 4.6, using the double-difference relocation method (hypoDD) focal mechanisms were also determined for a subset of events with a magnitude & . Our results show that the seismicity pattern and focal mechanism solutions are more consistent with a multiple event episode caused by the rupture of several antithetic faults that have a similar strike to the west Semangko fault in southernmost Sumatra rather than a single fault plane. These faults appear to be part of a small graben system located beneath Semangko Bay, which was likely activated by ongoing extension in the Sunda Strait.
The future of passive seismic acquisition
Publisher: Oxford University Press (OUP)
Date: 04-2019
Irregular interface parametrization in 3-D wide-angle seismic traveltime tomography
Publisher: Oxford University Press (OUP)
Date: 10-2003
Constraints on North Anatolian Fault Zone Width in the Crust and Upper Mantle FromSWave Teleseismic Tomography
Publisher: American Geophysical Union (AGU)
Date: 04-2018
DOI: 10.1002/2017JB015386
The Coupled Magmatic and Hydrothermal Systems of the Restless Aluto Caldera, Ethiopia
Publisher: Frontiers Media SA
Date: 14-10-2020
Origin of lateral heterogeneities in the upper mantle beneath South-East Australia from seismic tomography
Publisher: Springer International Publishing
Date: 2015
Seismic imaging of continents and their margins: New research at the confluence of active and passive seismology
Publisher: Elsevier BV
Date: 10-2012
3-D multiobservable probabilistic inversion for the compositional and thermal structure of the lithosphere and upper mantle: III. Thermochemical tomography in the Western-Central U.S.
Publisher: American Geophysical Union (AGU)
Date: 10-2016
DOI: 10.1002/2016JB013049
On the origin of seismic anisotropy in the shallow crust of the Northern Volcanic Zone, Iceland
Publisher: Wiley
Date: 13-07-2021
SEISMIC TRAVELTIME TOMOGRAPHY OF THE CRUST AND LITHOSPHERE
Publisher: Elsevier
Date: 2003
Teleseismic Travel-Time Delays in the Las Vegas Basin
Publisher: Seismological Society of America (SSA)
Date: 08-2008
DOI: 10.1785/0120050239
Thermal Nature of Mantle Upwellings Below the Ibero‐Western Maghreb Region Inferred From Teleseismic Tomography
Publisher: American Geophysical Union (AGU)
Date: 02-2019
DOI: 10.1029/2018JB016531
Earth’s multi-scale topographic response to global mantle flow
Publisher: Springer Science and Business Media LLC
Date: 16-09-2019
On the use of sensitivity tests in seismic tomography
Publisher: Oxford University Press (OUP)
Date: 07-03-2016
DOI: 10.1093/GJI/GGW084
A New Shear‐Velocity Model of Continental Australia Based on Multi‐Scale Surface‐Wave Tomography
Publisher: American Geophysical Union (AGU)
Date: 27-06-2023
DOI: 10.1029/2023JB026688
Abstract: The Australian Seismological Reference Model (AuSREM) represents a state‐of‐the‐art geophysical synthesis of the Australian continent. To date, its shear‐wave component has limited resolution at lower‐crustal to uppermost‐mantle depths, where it is mainly constrained by sparse measurements collected at the local scale. In this study, we compile a large data set of surface‐wave phase velocities based on seismic ambient noise and teleseismic earthquakes, to produce Rayleigh and Love phase‐velocity maps of continental Australia in a broad period range (4–200 s). Via transdimensional Bayesian inversion, we translate the phase‐velocity maps into a 3‐D shear‐wave velocity model extending to 300 km depth. Owing to the unprecedented seismic coverage and to the joint use of ambient‐noise and teleseismic data, the retrieved model fills a tomographic gap in the known shear‐wave velocity structure of the continent, comprising lower‐crustal to uppermost mantle depths. Consistent with AuSREM, strong velocity heterogeneities in our model highlight the (faster) cratonic blocks and the (slower) sedimentary basins at upper‐crustal depths. At mantle depths, the most prominent feature of the continent is a large‐scale eastward decrease in shear‐wave velocity. We interpret our observations in light of the relevant literature, and produce depth maps of the Moho and lithosphere‐asthenosphere boundary (LAB). Notably, our LAB proxy features a stripe of thicker lithosphere extending to the east coast, which is not visible in the AuSREM LAB model. This observation supports the idea that lateral variations in lithospheric thickness control both the composition and volume of surface volcanism in eastern Australia.
On the origin of recent intraplate volcanism in Australia
Publisher: Geological Society of America
Date: 12-2014
DOI: 10.1130/G36093.1
Simultaneous inversion of active and passive source datasets for 3-D seismic structure with application to Tasmania
Publisher: American Geophysical Union (AGU)
Date: 23-12-2006
DOI: 10.1029/2006GL028105
New evidence of Tasmania's tectonic history from a novel seismic experiment
Publisher: American Geophysical Union (AGU)
Date: 09-2001
DOI: 10.1029/2001GL013342
Automatic differentiation in geophysical inverse problems
Publisher: Oxford University Press (OUP)
Date: 07-2007
DOI: 10.1111/J.1365-246X.2007.03400.X
Abstract: Automatic differentiation (AD) is the technique whereby output variables of a computer code evaluating any complicated function (e.g. the solution to a differential equation) can be differentiated with respect to the input variables. Often AD tools take the form of source to source translators and produce computer code without the need for deriving and hand coding of explicit mathematical formulae by the user. The power of AD lies in the fact that it combines the generality of finite difference techniques and the accuracy and efficiency of analytical derivatives, while at the same time eliminating ‘human’ coding errors. It also provides the possibility of accurate, efficient derivative calculation from complex ‘forward’ codes where no analytical derivatives are possible and finite difference techniques are too cumbersome. AD is already having a major impact in areas such as optimization, meteorology and oceanography. Similarly it has considerable potential for use in non-linear inverse problems in geophysics where linearization is desirable, or for sensitivity analysis of large numerical simulation codes, for ex le, wave propagation and geodynamic modelling. At present, however, AD tools appear to be little used in the geosciences. Here we report on experiments using a state of the art AD tool to perform source to source code translation in a range of geoscience problems. These include calculating derivatives for Gibbs free energy minimization, seismic receiver function inversion, and seismic ray tracing. Issues of accuracy and efficiency are discussed.
Seismic structure of the southeast Australian lithosphere from surface and body wave tomography
Publisher: Elsevier BV
Date: 10-2012
Inversion for interface structure using teleseismic traveltime residuals
Publisher: Oxford University Press (OUP)
Date: 25-06-1998
Post‐Subduction Tectonics of Sabah, Northern Borneo, Inferred From Surface Wave Tomography
Publisher: American Geophysical Union (AGU)
Date: 04-02-2022
DOI: 10.1029/2021GL096117
Abstract: We use two‐plane‐wave tomography with a dense network of seismic stations across Sabah, northern Borneo, to image the shear wave velocity structure of the crust and upper mantle. Our model is used to estimate crustal thickness and the depth of the lithosphere‐asthenosphere boundary (LAB) beneath the region. Calculated crustal thickness ranges between 25 and 55 km and suggests extension in a NW‐SE direction, presumably due to back‐arc processes associated with subduction of the Celebes Sea. We estimate the β‐factor to be 1.3–2, well below the initiation of seafloor spreading. The LAB is, on average, at a depth of 100 km, which is inconsistent with models that ascribe Neogene uplift to wholescale removal of the mantle lithosphere. Instead, beneath a region of Plio‐Pleistocene volcanism in the southeast, we image a region 50–100 km across where the lithosphere has thinned to km, supporting recent suggestions of lower lithospheric removal through a Rayleigh‐Taylor instability.
Introduction to the special issue on convergent plate margin dynamics
Publisher: Elsevier BV
Date: 03-2010
Transdimensional inversion of ambient seismic noise for 3D shear velocity structure of the tasmanian crust
Publisher: Society of Exploration Geophysicists
Date: 05-2013
Abstract: Ambient seismic noise tomography has proven to be a valuable tool for imaging 3D crustal shear velocity using surface waves however, conventional two-stage inversion schemes are severely limited in their ability to properly quantify solution uncertainty and account for inhomogeneous data coverage. In response to these challenges, we developed a two-stage hierarchical, transdimensional, Bayesian scheme for inverting surface wave dispersion information for a 3D shear velocity structure and apply it to ambient seismic noise data recorded in Tasmania, southeast Australia. The key advantages of our Bayesian approach are that the number and distribution of model parameters are implicitly controlled by the data and that the standard deviation of the data noise is treated as an unknown in the inversion. Furthermore, the use of Bayesian inference — which combines prior model information and observed data to quantify the a posteriori probability distribution — means that model uncertainty information can be correctly propagated from the dispersion curves to the phase velocity maps and finally onward to the 1D shear models that are combined to form a composite 3D image. We successfully applied the new method to ambient noise dispersion data (1–12-s period) from Tasmania. The results revealed an east-dipping anomalously low shear velocity zone that extends to at least a 15-km depth and can be related to the accretion of oceanic crust onto the eastern margin of Proterozoic Tasmania during the mid-Paleozoic.
Testing the limits of virtual deep seismic sounding via new crustal thickness estimates of the Australian continent
Publisher: Oxford University Press (OUP)
Date: 26-04-2019
DOI: 10.1093/GJI/GGZ191
Oceanic crustal flow in Iceland observed using seismic anisotropy
Publisher: Springer Science and Business Media LLC
Date: 03-2021
CoTrRank: Trust Evaluation of Users and Tweets
Publisher: International Joint Conferences on Artificial Intelligence Organization
Date: 08-2019
Abstract: Trust evaluation of people and information on Twitter is critical for maintaining a healthy online social environment. How to evaluate the trustworthiness of users and tweets becomes a challenging question. In this demo, we show how our proposed CoTrRank approach deal with this problem. This approach models users and tweets in two coupled networks and calculate their trust values in different trust spaces. In particular, our solution provides a configurable way when mapping the calculated raw evidences to the trust values. The CoTrRank demo system has an interactive interface to show how our proposed approach produces more effective and adaptive trust evaluation results comparing with baseline methods.
Structural controls on localized intraplate deformation and seismicity in Southern Australia: Insights from local earthquake tomography of the Flinders Ranges
Publisher: American Geophysical Union (AGU)
Date: 05-2013
DOI: 10.1002/JGRB.50168
Evidence for crustal extension and inversion in eastern Tasmania, Australia, During the neoproterozoic nd early palaeozoic
Publisher: Elsevier BV
Date: 12-2000
Seismic ray tracing and wavefront tracking in laterally heterogeneous media
Publisher: Elsevier
Date: 2008
Crustal thickness beneath Mt. Merapi and Mt. Merbabu, Central Java, Indonesia, inferred from receiver function analysis
Publisher: Elsevier BV
Date: 05-2020
Seismic tomography of Nabro caldera, Eritrea: insights into the magmatic and hydrothermal systems of a recently erupted volcano
Publisher: Wiley
Date: 16-10-2022
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
A common deep source for upper-mantle upwellings below the Ibero-western Maghreb region from teleseismic P-wave travel-time tomography
Publisher: Elsevier BV
Date: 10-2018
Fate of Forearc Lithosphere at Arc‐Continent Collision Zones: Evidence From Local Earthquake Tomography of the Sunda‐Banda Arc Transition, Indonesia
Publisher: American Geophysical Union (AGU)
Date: 23-03-2020
DOI: 10.1029/2019GL086472
A dynamic objective function technique for generating multiple solution models in seismic tomography
Publisher: Oxford University Press (OUP)
Date: 07-2008
Insights into the structure of the upper mantle beneath the Murray Basin from 3D teleseismic tomography
Publisher: Informa UK Limited
Date: 08-2006
Effects of post-subduction processes on continental lithosphere
Publisher: Research Square Platform LLC
Date: 08-09-2021
DOI: 10.21203/RS.3.RS-861968/V1
Abstract: Subduction is a key driver of plate tectonics on Earth1. A range of observations indicate that the termination of subduction leads to erse and unexplained tectonic and geological activity, including anomalous magmatism, exhumation and topographic subsidence, followed by rapid uplift. However, the mechanism driving this complex surface response remains enigmatic. A prime ex le of recent subduction termination can be found in northern Borneo (Malaysia), where subduction ceased in the late Miocene2 and was followed by a puzzling tectonic response3,4,5,6,7,8 that cannot be reconciled with our current understanding of post-subduction tectonics. Here, we use new passive-seismic data to image, in unprecedented detail, a sub-vertical lithospheric drip that developed as a Rayleigh-Taylor gravitational instability9 from the root of a volcanic arc. We use thermo-mechanical simulations to reconcile these images with time-dependent dynamical processes within the crust and underlying mantle following subduction termination. Our model predictions illustrate how significant extension from a downwelling lithospheric drip can thin the crust in an adjacent orogenic belt, facilitating lower crustal melting and possible exhumation of subcontinental material. Our study provides a new paradigm for core-complex formation in other areas of recent subduction termination.
Transdimensional ambient noise tomography of Bass Strait, southeast Australia, reveals the sedimentary basin and deep crustal structure beneath a failed continental rift
Publisher: Oxford University Press (OUP)
Date: 04-07-2019
DOI: 10.1093/GJI/GGZ057
Lithospheric Structure and Tectonic Processes Constrained by Microearthquake Activity at the Central Ultraslow-Spreading Southwest Indian Ridge (49.2° to 50.8°E)
Publisher: American Geophysical Union (AGU)
Date: 25-08-2018
DOI: 10.1029/2017JB015367
New insights into North Sea deep crustal structure and extension from transdimensional ambient noise tomography
Publisher: Oxford University Press (OUP)
Date: 10-10-2020
DOI: 10.1093/GJI/GGAA475
Abstract: The deep crustal structure beneath the North Sea is poorly understood since it is constrained by only a few seismic reflection and refraction profiles. However, it is widely acknowledged that the mid to lower crust plays important roles in rift initiation and evolution, particularly when large-scale sutures and/or terrane boundaries are present, since these inherited features can focus strain or act as inhibitors to extensional deformation. Ancient tectonic features are known to exist beneath the iconic failed rift system of the North Sea, making it an ideal location to investigate the complex interplay between pre-existing regional heterogeneity and rifting. To this end, we produce a 3-D shear wave velocity model from transdimensional ambient seismic noise tomography to constrain crustal properties to ∼30 km depth beneath the North Sea and its surrounding landmasses. Major North Sea sedimentary basins appear as low shear wave velocity zones that are a good match to published sediment thickness maps. We constrain relatively thin crust (13–18 km) beneath the Central Graben depocentres that contrasts with crust elsewhere at least 25–30 km thick. Significant variations in crustal structure and rift symmetry are identified along the failed rift system that appears to be related to the locations of Laurentia–Avalonia–Baltica palaeoplate boundaries. We constrain first-order differences in structure between palaeoplates with strong lateral gradients in crustal velocity related to Laurentia–Avalonia–Baltica plate juxtaposition and reduced lower crustal velocities in the vicinity of the Thor suture, possibly representing the remnants of a Caledonian accretionary complex. Our results provide fresh insight into the pivotal roles that ancient terranes can play in the formation and failure of continental rifts and may help explain the characteristics of other similar continental rifts globally.
Related Organisations
University Of Cambridge
Location: United Kingdom of Great Britain and Northern Ireland
University Of Aberdeen
Location: United Kingdom of Great Britain and Northern Ireland
Related Funding Activities
Linkage Projects - Grant ID: LP0990266
Start Date: 10-2009
End Date: 02-2012
Amount: $100,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP130100134
Start Date: 06-2014
End Date: 12-2018
Amount: $600,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE120100061
Start Date: 01-2012
End Date: 12-2012
Amount: $285,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP200101854
Start Date: 07-2020
End Date: 12-2023
Amount: $626,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP220100173
Start Date: 11-2022
End Date: 11-2025
Amount: $407,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP0986750
Start Date: 2009
End Date: 12-2011
Amount: $300,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP120103673
Start Date: 2012
End Date: 12-2016
Amount: $420,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP190100635
Start Date: 10-2020
End Date: 10-2023
Amount: $573,068.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP0770131
Start Date: 2007
End Date: 12-2009
Amount: $251,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP0556282
Start Date: 2005
End Date: 12-2008
Amount: $305,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP110100256
Start Date: 09-2011
End Date: 09-2014
Amount: $214,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP190102940
Start Date: 05-2019
End Date: 12-2022
Amount: $370,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP0451133
Start Date: 2004
End Date: 12-2007
Amount: $255,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP170100058
Start Date: 06-2017
End Date: 06-2020
Amount: $286,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP120102372
Start Date: 01-2012
End Date: 02-2017
Amount: $285,000.00
Funder: Australian Research Council
View Funded Activity