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Supershear rupture in a M_w 6.7 aftershock of the 2013 Sea of Okhotsk earthquake

Zhan, Zhongwen and Helmberger, Donald V. and Kanamori, Hiroo and Shearer, Peter M. (2014) Supershear rupture in a M_w 6.7 aftershock of the 2013 Sea of Okhotsk earthquake. Science, 345 (6193). pp. 204-207. ISSN 0036-8075. https://resolver.caltech.edu/CaltechAUTHORS:20140815-120059262

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Abstract

Earthquake rupture speeds exceeding the shear-wave velocity have been reported for several shallow strike-slip events. Whether supershear rupture also can occur in deep earthquakes is unclear, because of their enigmatic faulting mechanism. Using empirical Green's functions in both regional and teleseismic waveforms, we observed supershear rupture during the 2013 moment magnitude (M_w) 6.7 deep earthquake beneath the Sea of Okhotsk, an aftershock of the large deep earthquake (Mw 8.3). The M_w 6.7 event ruptured downward along a steeply dipping fault plane at an average speed of 8 kilometers per second, suggesting efficient seismic energy generation. Comparing it to the highly dissipative 1994 M_w 8.3 Bolivia earthquake, the two events represent end members of deep earthquakes in terms of energy partitioning and imply that there is more than one rupture mechanism for deep earthquakes.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://www.sciencemag.org/content/345/6193/204.abstractPublisherArticle
http://dx.doi.org/10.1126/science.1252717DOIArticle
http://www.sciencemag.org/content/345/6193/204/suppl/DC1Related ItemSupplementary Materials
ORCID:
AuthorORCID
Zhan, Zhongwen0000-0002-5586-2607
Kanamori, Hiroo0000-0001-8219-9428
Shearer, Peter M.0000-0002-2992-7630
Alternate Title:Supershear rupture in a Mw 6.7 aftershock of the 2013 Sea of Okhotsk earthquake
Additional Information:© 2014 American Association for the Advancement of Science. 27 February 2014; accepted 2 June 2014. We thank two anonymous reviewers for their helpful comments. The Incorporated Research Institutions for Seismology (IRIS) provided the seismic data. This work was supported by NSF (grants EAR-1142020 and EAR-1111111). All data used are available from the IRIS data center at www.iris.edu.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
NSFEAR-1142020
NSFEAR-1111111
Issue or Number:6193
Record Number:CaltechAUTHORS:20140815-120059262
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140815-120059262
Official Citation:Supershear rupture in a Mw 6.7 aftershock of the 2013 Sea of Okhotsk earthquake Zhongwen Zhan, Donald V. Helmberger, Hiroo Kanamori, and Peter M. Shearer Science 11 July 2014: 345 (6193), 204-207. [DOI:10.1126/science.1252717]
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48617
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:19 Aug 2014 23:06
Last Modified:03 Oct 2019 07:05

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