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Decay and expansion of the early aftershock activity following the 2011, M_w9.0 Tohoku earthquake

Lengliné, O. and Enescu, B. and Peng, Z. and Shiomi, K. (2012) Decay and expansion of the early aftershock activity following the 2011, M_w9.0 Tohoku earthquake. Geophysical Research Letters, 39 . Art. No. L18309. ISSN 0094-8276.

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The 2011, M_w9.0 Tohoku earthquake was followed by an abundant amount of seismicity providing a unique opportunity to analyze the triggering mechanism of great earthquakes. Although the Tohoku earthquake occurred close to a dense seismic network, many aftershocks that occurred in the first few hours after the mainshock are not recorded in the earthquake catalogs. Here we use a template waveform approach to recover as many as possible missing events in the first 12 hours following the Tohoku mainshock. Our analysis is able to detect about 1.4 times more events than those listed in the High Sensitivity Seismograph (Hi-net) earthquake catalog. Combining our new dataset with earthquakes that occurred at latter times, we are able to observe a continuous decay of the aftershock rate and along strike expansion of aftershock area. We relate the latter observation to the occurrence of post-seismic slip over the deep interface.

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Additional Information:© 2012 American Geophysical Union. Received 19 June 2012; revised 20 August 2012; accepted 20 August 2012; published 28 September 2012. We thank the Japan Meteorological Agency for sharing the JMA catalog. We would like to thank T. Nishimura for providing the slip models for the Tohoku earthquake and A. Kato, A. Maggi, S. Hainzl, D. Marsan and an anonymous reviewer for insightful comments. Computations were made on the HPC cluster of the Université de Strasbourg. Z.P. is supported by the National Science Foundation (NSF) through award EAR-0956051. B.E. and K.S. are supported by the research project on “Earthquakes and volcanoes based on fundamental precise monitoring networks” of NIED. The Editor thanks Kato Aitaro and an anonymous reviewer for assisting in the evaluation of this paper.
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Subject Keywords:Japan; Tohoku; aftershocks; post-seismic slip
Record Number:CaltechAUTHORS:20121105-141851238
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Official Citation:Lengliné, O., B. Enescu, Z. Peng, and K. Shiomi (2012), Decay and expansion of the early aftershock activity following the 2011, Mw9.0 Tohoku earthquake, Geophys. Res. Lett., 39, L18309, doi:10.1029/2012GL052797
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35287
Deposited By: Tony Diaz
Deposited On:14 Nov 2012 00:35
Last Modified:03 Oct 2019 04:26

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