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The 2 March 2016 Wharton Basin M_w 7.8 earthquake: High stress drop north-south strike-slip rupture in the diffuse oceanic deformation zone between the Indian and Australian Plates

Lay, Thorne and Ye, Lingling and Ammon, Charles J. and Dunham, Audrey and Koper, Keith D. (2016) The 2 March 2016 Wharton Basin M_w 7.8 earthquake: High stress drop north-south strike-slip rupture in the diffuse oceanic deformation zone between the Indian and Australian Plates. Geophysical Research Letters, 43 (15). pp. 7937-7945. ISSN 0094-8276. http://resolver.caltech.edu/CaltechAUTHORS:20161013-163527423

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Abstract

The diffuse deformation zone between the Indian and Australian plates has hosted numerous major and great earthquakes during the seismological record, including the 11 April 2012 M_w 8.6 event, the largest recorded intraplate earthquake. On 2 March 2016, an M_w 7.8 strike-slip faulting earthquake occurred in the northwestern Wharton Basin, in a region bracketed by north-south trending fracture zones with no previously recorded large event nearby. Despite the large magnitude, only minor source finiteness is evident in aftershock locations or resolvable from seismic wave processing including high-frequency P wave backprojections and Love wave directivity analysis. Our analyses indicate that the event ruptured bilaterally on a north-south trending fault over a length of up to 70 km, with rupture speed of ≤ 2 km/s, and a total duration of ~35 s. The estimated stress drop, ~20 MPa, is high, comparable to estimates for other large events in this broad intraplate oceanic deformation zone.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1002/2016GL069931DOIArticle
http://onlinelibrary.wiley.com/doi/10.1002/2016GL069931/abstractPublisherArticle
ORCID:
AuthorORCID
Lay, Thorne0000-0003-2360-4213
Ye, Lingling0000-0002-8739-2072
Alternate Title:The 2 March 2016 Wharton Basin Mw 7.8 earthquake: High stress drop north-south strike-slip rupture in the diffuse oceanic deformation zone between the Indian and Australian Plates
Additional Information:© 2016 American Geophysical Union. Received 6 JUN 2016. Accepted 21 JUL 2016. Accepted article online 25 JUL 2016. Published online 4 AUG 2016. This work made use of GMT and SAC software. We thank M. Cleveland for his help with and use of his relocation software for the aftershock analysis. Gavin Hayes and an anonymous reviewer provided constructive comments on the manuscript. The IRIS DMS data center was used to access the seismic data from Global seismic network and Federation of Digital Seismic Network stations. This work was supported by NSF grant EAR0635570 (T.L.).
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
NSFEAR-0635570
Subject Keywords:Wharton Basin; intraplate deformation; strike-slip faulting; 2 March 2016 earthquake
Record Number:CaltechAUTHORS:20161013-163527423
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20161013-163527423
Official Citation:Lay, T., L. Ye, C. J. Ammon, A. Dunham, and K. D. Koper (2016), The 2 March 2016 Wharton Basin Mw 7.8 earthquake: High stress drop north-south strike-slip rupture in the diffuse oceanic deformation zone between the Indian and Australian Plates, Geophys. Res. Lett., 43, 7937–7945, doi:10.1002/2016GL069931.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71075
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:14 Oct 2016 20:26
Last Modified:06 Oct 2017 23:21

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