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The 2013 Okhotsk deep-focus earthquake: Rupture beyond the metastable olivine wedge and thermally controlled rise time near the edge of a slab

Meng, Lingsen and Ampuero, Jean-Paul and Bürgmann, Roland (2014) The 2013 Okhotsk deep-focus earthquake: Rupture beyond the metastable olivine wedge and thermally controlled rise time near the edge of a slab. Geophysical Research Letters, 41 (11). pp. 3779-3785. ISSN 0094-8276. http://resolver.caltech.edu/CaltechAUTHORS:20140818-082330095

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Abstract

The 2013 M8.3 Okhotsk earthquake involves two primary mechanisms of deep-focus earthquake rupture, mineral phase transformation of olivine to spinel and thermal shear instability. Backprojection imaging of broadband seismograms recorded by the North American and European networks indicates bilateral rupture toward NE and SSE. The rupture paths of the NE segment and other regional M7 earthquakes are confined in narrow regions along the slab contours, consistent with the phase transformation mechanism. However, the SSE rupture propagates a long distance across the slab and aftershocks are distributed across a ~60 km wide zone, beyond the plausible thickness of the metastable olivine wedge, favoring thermal shear weakening. While the NE rupture is only visible at high frequencies, the SSE rupture is consistently observed across a broad-frequency range. This frequency-dependent rupture mode can be explained by lateral variations of rise time controlled by thermal thinning of the slab near its northern end.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://onlinelibrary.wiley.com/doi/10.1002/2014GL059968/abstractPublisherArticle
http://dx.doi.org/10.1002/2014GL059968DOIArticle
http://onlinelibrary.wiley.com/doi/10.1002/2014GL059968/suppinfoRelated ItemSupporting Information
ORCID:
AuthorORCID
Ampuero, Jean-Paul0000-0002-4827-7987
Additional Information:© 2014 American Geophysical Union. Received 21 Mar 2014. Accepted 14 May 2014. Accepted article online 16 May 2014. Published online 2 Jun 2014. This research was supported by the Gordon and Betty Moore Foundation and by NSF (grant EAR-1151926). The IRIS (www.iris.edu) and the European ORFEUS (www.orfeus-eu.org) data centers provided access to broadband seismograms. The catalog of historical seismicity and aftershocks is obtained from ISC bulletin (http://www.isc.ac.uk/). We thank Scott French and Barbara Romanowicz for valuable discussions about tomographic models in the Kamchatka region. We thank Pei-Ru Jian and Shu-Huei Hong for discussions of the regional M7 deep earthquakes. The Editor thanks two anonymous reviewers for their assistance in evaluating this paper.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
Gordon and Betty Moore FoundationUNSPECIFIED
NSFEAR-1151926
Subject Keywords:deep-focus earthquake; thermal instability; backprojection
Record Number:CaltechAUTHORS:20140818-082330095
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140818-082330095
Official Citation:Meng, L., J.-P. Ampuero, and R. Bürgmann (2014), The 2013 Okhotsk deep-focus earthquake: Rupture beyond the metastable olivine wedge and thermally controlled rise time near the edge of a slab, Geophys. Res. Lett., 41, 3779–3785, doi:10.1002/2014GL059968.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48636
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:19 Aug 2014 22:17
Last Modified:17 Sep 2015 20:05

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