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The seismic cycle in the area of the 2011 M_w9.0 Tohoku-Oki earthquake

Perfettini, H. and Avouac, J. P. (2014) The seismic cycle in the area of the 2011 M_w9.0 Tohoku-Oki earthquake. Journal of Geophysical Research. Solid Earth, 119 (5). pp. 4469-4515. ISSN 2169-9313. http://resolver.caltech.edu/CaltechAUTHORS:20140724-154902013

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Abstract

We model seismic and aseismic slip on the Japan megathrust in the area of the M_w9.0, 2011 Tohoku-Oki earthquake based on daily time series from 400 GPS stations of the GEONET network and campaign measurements of six sea floor displacements. The coseismic and postseismic slip distributions are inverted simultaneously using principal component analysis-based inversion method (PCAIM). Exploring a wide range of boundary conditions and regularization constraints, we found the coseismic slip distribution to be quite compact with a peak slip between 30 and 50 m near the trench. Our model shows deep afterslip fringing the downdip edge of the coseismic rupture but also a dominant zone of shallow afterslip. Afterslip over the first 279 days following the main shock represents about 40% of the coseismic moment. We compare the coseismic and postseismic models with an interseismic coupling model derived from inland and sea bottom measurements determined in a self-consistent manner. Assuming that seismic and aseismic slip had to match the long-term slip rate along the megathrust, the recurrence time of M_w9.0 earthquakes is estimated to 100–300 years, while historical and paleotsunami records suggest a return period more of the order of 1000 years. The discrepancy is smaller if the shallower portion of the megathrust is assumed to produce both aseismic slip, as the afterslip model suggests, and seismic slip during occasional large tsunamigenic earthquakes.


Item Type:Article
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http://dx.doi.org/10.1002/2013JB010697DOIArticle
http://onlinelibrary.wiley.com/doi/10.1002/2013JB010697/abstractPublisherArticle
Alternate Title:The seismic cycle in the area of the 2011 Mw9.0 Tohoku-Oki earthquake
Additional Information:© 2014 American Geophysical Union. Received 23 September 2013; Accepted 31 March 2014; Accepted article online 3 April 2014; Published online 27 May 2014. We thank Michiko Onogaki for providing the GEONET data, Brendan Meade for providing the interseismic velocities of Loveless and Meade [2010], Shinzaburo Ozawa, Mohamed Chlieh, Hiroo Kanamori, Michael Bevis, Erwan Pathier, and Michel Bouchon for useful discussions. We thank Tom Parson, Marcos Moreno and an anonymous reviewer for their constructive reviews that really helped improving the manuscript. Some of the figures of this paper have been done using GMT (http://gmt.soest.hawaii.edu/). This is Tectonics Observatory contribution #260.
Group:Caltech Tectonics Observatory, Seismological Laboratory
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Tectonics Observatory260
Record Number:CaltechAUTHORS:20140724-154902013
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140724-154902013
Official Citation:Perfettini, H., and J. P. Avouac (2014), The seismic cycle in the area of the 2011 Mw9.0 Tohoku-Oki earthquake, J. Geophys. Res. Solid Earth, 119, 4469–4515, doi:10.1002/2013JB010697.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47483
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:24 Jul 2014 23:05
Last Modified:11 Jun 2015 13:57

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