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Supershear rupture in the 24 May 2013 M_w 6.7 Okhotsk deep earthquake: Additional evidence from regional seismic stations

Zhan, Zhongwen and Shearer, Peter M. and Kanamori, Hiroo (2015) Supershear rupture in the 24 May 2013 M_w 6.7 Okhotsk deep earthquake: Additional evidence from regional seismic stations. Geophysical Research Letters, 42 (19). pp. 7941-7948. ISSN 0094-8276. http://resolver.caltech.edu/CaltechAUTHORS:20151119-104309386

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Abstract

Zhan et al. (2014a) reported supershear rupture during the M_w 6.7 aftershock of the 2013 M_w 8.3 Sea of Okhotsk deep earthquake, relying heavily on the regional station PET, which played a critical role in constraining the vertical rupture dimension and rupture speed. Here we include five more regional stations and find that the durations of the source time functions derived from these stations are consistent with Zhan et al.'s supershear rupture model. Furthermore, to reduce the nonuniqueness of deconvolution and combine the bandwidths of different stations, we conduct a joint inversion of the six regional stations for a single broadband moment-rate function (MRF). The best fitting MRF, which explains all the regional waveforms well, has a smooth shape without any temporal gaps. The M_w 6.7 Okhotsk deep earthquake is more likely a continuous supershear rupture than a dynamically triggered doublet.


Item Type:Article
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URLURL TypeDescription
http://dx.doi.org/10.1002/2015GL065446DOIArticle
http://onlinelibrary.wiley.com/doi/10.1002/2015GL065446/abstractPublisherArticle
Additional Information:© 2015 American Geophysical Union. Received 19 JUL 2015; Accepted 10 SEP 2015; Accepted article online 14 SEP 2015; Published online 3 OCT 2015. Victor Chebrov and Anastasia Chebrova kindly made available to us the broadband data from seismic stations of the Kamchatka Branch of Geophysical Survey, Russian Academy of Science. Incorporated Research Institutions for Seismology (IRIS) provided the seismic data of station PET and the teleseismic stations (http://dx.doi.org/doi:10.7914/SN/IU). We thank two anonymous reviewers for their helpful comments. This work was supported by National Science Foundation grant EAR-111111.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
NSFEAR-111111
Record Number:CaltechAUTHORS:20151119-104309386
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20151119-104309386
Official Citation:Zhan, Z., P. M. Shearer, and H. Kanamori (2015), Supershear rupture in the 24 May 2013 Mw 6.7 Okhotsk deep earthquake: Additional evidence from regional seismic stations, Geophys. Res. Lett., 42, 7941–7948, doi:10.1002/2015GL065446
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:62234
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:19 Nov 2015 19:52
Last Modified:02 May 2016 19:27

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