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Intraslab rupture triggering megathrust rupture coseismically in the 17 December 2016 Solomon Islands M_w 7.9 earthquake

Lay, Thorne and Ye, Lingling and Ammon, Charles J. and Kanamori, Hiroo (2017) Intraslab rupture triggering megathrust rupture coseismically in the 17 December 2016 Solomon Islands M_w 7.9 earthquake. Geophysical Research Letters, 44 (3). pp. 1286-1292. ISSN 0094-8276. http://resolver.caltech.edu/CaltechAUTHORS:20170323-083105984

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Abstract

The 17 December 2016 Solomon Islands earthquake (M_w 7.9) initiated ~103 km deep in the subducting Solomon Sea slab near the junction of the Solomon Islands and New Britain trenches. Most aftershocks are located near the Solomon Islands plate boundary megathrust west of Bougainville, where previous large interplate thrust faulting earthquakes occurred in 1995 (M_w 7.7) and 1971 (M_w 8.0). Teleseismic body wave modeling and aftershock relocations indicate that the initial 30 s of the 2016 rupture occurred over depths of 90 to 120 km on an intraslab fault dipping ~30° to the southwest, almost perpendicular to the dipping slab interface. The next 50 s of rupture took place at depths of 32 to 47 km in the deeper (Domain C) portion of the overlying megathrust fault dipping ~35° to the northeast. High susceptibility to triggering in the region accounts for this compound rupture of two separate fault planes.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1002/2017GL072539DOIArticle
http://onlinelibrary.wiley.com/doi/10.1002/2017GL072539/abstractPublisherArticle
ORCID:
AuthorORCID
Lay, Thorne0000-0003-2360-4213
Kanamori, Hiroo0000-0001-8219-9428
Additional Information:© 2017 American Geophysical Union. Received 5 JAN 2017; Accepted 27 JAN 2017; Accepted article online 29 JAN 2017; Published online 4 FEB 2017. The IRIS DMS data center (http://www.iris.edu/hq/) was used to access the seismic data from Global Seismic Network and Federation of Digital Seismic Network stations. We thank Chen Ji and an anonymous reviewer for constructive reviews of the manuscript. This work was supported by U.S. NSF grant EAR1245717 to Thorne Lay.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
NSFEAR-1245717
Subject Keywords:Solomon Islands; intraplate earthquake; megathrust triggering; earthquake doublet; fault interaction
Record Number:CaltechAUTHORS:20170323-083105984
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170323-083105984
Official Citation:Lay, T., L. Ye, C. J. Ammon, and H. Kanamori (2017), Intraslab rupture triggering megathrust rupture coseismically in the 17 December 2016 Solomon Islands Mw 7.9 earthquake, Geophys. Res. Lett., 44, 1286–1292, doi:10.1002/2017GL072539
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75347
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:30 Mar 2017 19:29
Last Modified:02 Aug 2017 16:57

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