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Migration process of very low-frequency events based on a chain-reaction model and its application to the detection of preseismic slip for megathrust earthquakes

Ariyoshi, Keisuke and Matsuzawa, Toru and Ampuero, Jean-Paul and Nakata, Ryoko and Hori, Takane and Kaneda, Yoshiyuki and Hino, Ryota and Hasegawa, Akira (2012) Migration process of very low-frequency events based on a chain-reaction model and its application to the detection of preseismic slip for megathrust earthquakes. Earth Planets and Space, 64 (8). pp. 693-702. ISSN 1343-8832. https://resolver.caltech.edu/CaltechAUTHORS:20120905-080448868

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Abstract

In order to reproduce slow earthquakes with short duration such as very low frequency events (VLFs) migrating along the trench direction as swarms, we apply a 3-D subduction plate boundary model based on the slowness law of rate- and state-dependent friction, introducing close-set numerous small asperities (rate-weakening regions) at a depth of 30 km under high pore pressure condition, in addition to a large asperity. Our simulation indicates that swarms of slip events occur repeatedly at the small asperities, and these events are similar to the observed slow earthquake group, especially to VLF, on the basis of the relation between characteristic duration and seismic moment. No slip events occur there without the small asperities, which mean that the close-set numerous small asperities may be one of the necessary conditions for generating the short-duration slow earthquakes such as VLFs. In the preseismic stage of the megathrust earthquakes that occur at the large asperity, the swarms of VLFs have higher migration speeds and higher moment release rate as well as shorter recurrence interval. Thus, monitoring the migration of slow earthquakes may be useful in imaging the preseismic slip of megathrust earthquakes.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.5047/eps.2010.09.003DOIArticle
http://www.terrapub.co.jp/journals/EPS/abstract/6408/64080693.htmlPublisherArticle
https://earth-planets-space.springeropen.com/articles/10.5047/eps.2010.09.003PublisherArticle
ORCID:
AuthorORCID
Ampuero, Jean-Paul0000-0002-4827-7987
Additional Information:© 2012 Society of Geomagnetism and Earth, Planetary and Space Sciences. Received March 29, 2010; Revised September 29, 2010; Accepted September 30, 2010; Online published August 27. 2012. The authors would like to thank Dr. Kazushige Obara and Dr. Bunichiro Shibazaki for their fruitful discussion, which helped to narrow the target of our simulation. Thoughtful comments from N. Kato and an anonymous reviewer kindly helped us to improve this manuscript. The present study used the Earth Simulator and the supercomputing resources at the Cyberscience Center of Tohoku University. GMT software (Wessel and Smith, 1998) was used to draw a number of the figures. The present study was supported by the DONET program of the Ministry of Education, Culture, Sports, Science and Technology.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
Ministry of Education, Culture, Sports, Science and Technology (MEXT)DONET
Subject Keywords:Numerical simulation, friction law, slow earthquake, low-frequency tremor, preseismic change.
Issue or Number:8
Record Number:CaltechAUTHORS:20120905-080448868
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20120905-080448868
Official Citation:Migration process of very low-frequency events based on a chain-reaction model and its application to the detection of preseismic slip for megathrust earthquakes Keisuke Ariyoshi, Toru Matsuzawa, Jean-Paul Ampuero, Ryoko Nakata, Takane Hori, Yoshiyuki Kaneda, Ryota Hino, and Akira Hasegawa Earth Planets Space, Vol. 64 (No. 8), pp. 693-702, 2012
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33844
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:05 Sep 2012 15:58
Last Modified:03 Oct 2019 04:13

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