ORCID Profile
0000-0002-0738-0187
Current Organisation
Australian National University
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Seismology and seismic exploration | Geophysics
Publisher: Elsevier BV
Date: 04-2017
Publisher: Oxford University Press (OUP)
Date: 21-02-2014
DOI: 10.1093/MNRAS/STU181
Publisher: Wiley
Date: 30-03-2021
Publisher: American Geophysical Union (AGU)
Date: 02-2022
DOI: 10.1029/2021GC010020
Abstract: Strong waveform complexities, including multipathing of the S diffracted phase and rapid changes in differential ScS‐S times, are observed for multiple deep Fiji earthquakes recorded at the USArray. The complexities occur at the northeastern edge of the Pacific Large Low Shear Velocity Province (LLSVP), about 12 degrees southeast of present‐day Hawaiʻi. Waveform modeling of the multipathing provides good constraints on an ultra‐low velocity zone (ULVZ) with a width of 5 degree located near the inner edge of the LLSVP. Based on the mineralogical‐modeling of the ULVZ as a solid iron‐rich magnesiowüstite‐bearing assemblage with compatible morphology predicted from geodynamical simulations, a ULVZ model with a thickness of 30 km and a shear wave velocity reduction of 18% is preferred. The rapid change in differential ScS‐S travel time is best explained by having both the aforementioned ULVZ and an adjacent high velocity structure near the LLSVP. Furthermore, a low‐velocity plume‐like structure could potentially explain the observed S travel time delay independent of ScS. These seismic features are proposed to be a ULVZ driven toward the edge of the LLSVP while potentially pushed by a subducted slab. This configuration may trigger plume generation due to strong thermal instabilities and is in the same vicinity where mantle flow models place the present‐day Hawaiian plume source. Multiple ScS can potentially be used to verify vertical plume structure in tomographic models but the accuracy of upper mantle structure, which is a key reflection point, needs to be considered.
Publisher: Wiley
Date: 02-08-2021
Publisher: American Geophysical Union (AGU)
Date: 13-11-2018
DOI: 10.1029/2018GL080485
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2019
Publisher: American Geophysical Union (AGU)
Date: 19-03-2019
DOI: 10.1029/2018GL081130
Publisher: California Institute of Technology
Date: 2020
DOI: 10.7907/5PQG-ST75
Publisher: American Geophysical Union (AGU)
Date: 24-04-2018
DOI: 10.1002/2018GL077481
Publisher: American Geophysical Union (AGU)
Date: 10-2021
DOI: 10.1029/2021JB022139
Abstract: Characterizing the large M4.7+ seismic events during the 2018 Kīlauea eruption is important to understand the complex subsurface deformation at the Kīlauea summit. The first 12 events (May 17–May 26) are associated with long‐duration seismic signals and the remaining 50 events (May 29–August 2) are accompanied by large‐scale caldera collapses. Resolving the source location and mechanism is challenging because of the shallow source depth, significant nondouble‐couple components, and complex velocity structure. We demonstrate that combining multiple geophysical data from broadband seismometers, accelerometers, and infrasound is essential to resolve different aspects of the seismic source. Seismic moment tensor solutions using near‐field summit stations show the early events are inflationary. Infrasound data and particle motion analysis identify the source of inflation as the Halema'uma'u reservoir. For the later collapse events, two‐independent moment tensor inversions using local and global stations consistently show that asymmetric slips occur on inward‐dipping normal faults along the northwest corner of the caldera. While the source mechanism from May 29 onwards is not fully resolvable seismically using far‐field stations, infrasound records, and simulations suggest there may be inflation during the collapse. The summit events are characterized by both inflation and asymmetric slip, which are consistent with geodetic data. Based on the location of the slip and microseismicity, the caldera may have failed in a “see‐saw” manner: small continuous slips in the form of microseismicity on the southeast corner of the caldera, compensated by large slips on the northwest during the large collapse events.
Publisher: American Geophysical Union (AGU)
Date: 12-06-2018
DOI: 10.1029/2018GL077683
Publisher: American Geophysical Union (AGU)
Date: 10-2020
DOI: 10.1029/2020JB019663
Publisher: Seismological Society of America (SSA)
Date: 10-11-2015
DOI: 10.1785/0120140285
Location: United States of America
Location: United States of America
Start Date: 11-2023
End Date: 11-2026
Amount: $349,000.00
Funder: Australian Research Council
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