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Constraining the Dip of Shallow, Shallowly Dipping Thrust Events Using Long-Period Love Wave Radiation Patterns: Applications to the 25 October 2010 Mentawai, Indonesia, and 4 May 2018 Hawaii Island Earthquakes

Lay, Thorne and Ye, Lingling and Kanamori, Hiroo and Satake, Kenji (2018) Constraining the Dip of Shallow, Shallowly Dipping Thrust Events Using Long-Period Love Wave Radiation Patterns: Applications to the 25 October 2010 Mentawai, Indonesia, and 4 May 2018 Hawaii Island Earthquakes. Geophysical Research Letters, 45 (19). pp. 10342-10349. ISSN 0094-8276. https://resolver.caltech.edu/CaltechAUTHORS:20181126-112641978

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Abstract

Constraining precise faulting geometry for shallow, shallowly dipping thrust earthquakes is a common challenge. Plate boundary megathrust faults near the trench and décollement faults beneath volcanic islands and nappes may dip only a few degrees. Long‐period point source moment tensor waveform inversions provide limited resolution of shallow fault dip angle. The possibility of splay faulting requires precise dip estimation. High sensitivity to dip is provided by long‐period Love wave amplitude azimuthal radiation patterns, which undergo rapid change from four lobed to two lobed as dip decreases from 10° to 0°. Modeling variability in Love wave nodal amplitudes allows the dip to be determined to within a few degrees. This is demonstrated for the 25 October 2010 Mentawai (M_(WW) 7.8) tsunami earthquake, which ruptured the 2.0–5.0° dipping megathrust beneath the shallow sedimentary wedge offshore of Indonesia, and the 4 May 2018 Hawaii Island (M_(WW) 6.9) thrust earthquake, which ruptured the 2.5–7.5° dipping décollement under the island flank.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1029/2018gl080042DOIArticle
ORCID:
AuthorORCID
Lay, Thorne0000-0003-2360-4213
Ye, Lingling0000-0002-8739-2072
Kanamori, Hiroo0000-0001-8219-9428
Satake, Kenji0000-0002-3368-3085
Additional Information:© 2018 American Geophysical Union. Received 13 AUG 2018; Accepted 17 SEP 2018; Accepted article online 21 SEP 2018; Published online 7 OCT 2018. The Incorporated Research Institutions for Seismology (IRIS) data management service (DMS) (http://www.iris.edu/hq/) was used to access the long‐period (LH) seismic data from Global Seismic Network and Federation of Digital Seismic Network stations. Two anonymous reviewers provided helpful comments on the manuscript. This work was supported by NSF grant EAR1802364 to Thorne Lay and the junior Thousand Talents Plan of China and the 100 Talents program of Sun Yat‐sen University to Lingling Ye.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
NSFEAR-1802364
Thousand Talents Plan of ChinaUNSPECIFIED
Sun Yat‐sen UniversityUNSPECIFIED
Subject Keywords:thrust fault dip; tsunami earthquakes; Hawaii basal decollement; surface wave spectra; surface wave radiation pattern; shallow megathrust
Issue or Number:19
Record Number:CaltechAUTHORS:20181126-112641978
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20181126-112641978
Official Citation:Lay, T., Ye, L., Kanamori, H., & Satake, K. (2018). Constraining the dip of shallow, shallowly dipping thrust events using long‐period Love wave radiation patterns: Applications to the 25 October 2010 Mentawai, Indonesia, and 4 May 2018 Hawaii Island earthquakes. Geophysical Research Letters, 45, 10,342–10,349. https://doi.org/10.1029/2018GL080042
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91167
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:26 Nov 2018 21:51
Last Modified:03 Oct 2019 20:32

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