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Influence of interaction between small asperities on various types of slow earthquakes in a 3-D simulation for a subduction plate boundary

Ariyoshi, Keisuke and Hori, Takane and Ampuero, Jean-Paul and Kaneda, Yoshiyuki and Matsuzawa, Toru and Hino, Ryota and Hasegawa, Akira (2009) Influence of interaction between small asperities on various types of slow earthquakes in a 3-D simulation for a subduction plate boundary. Gondwana Research , 16 (3-4). pp. 534-544. ISSN 1342-937X . https://resolver.caltech.edu/CaltechAUTHORS:20091103-105855916

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Abstract

Recently, the occurrence of slow earthquakes such as low-frequency earthquakes and very low-frequency earthquakes have been recognized at depths of about 30 km in southwest Japan and Cascadia. These slow earthquakes occur sometimes in isolation and sometimes break into chain-reaction, producing tremor that migrates at a speed of about 5–15 km/day and suggesting a strong interaction among nearby small asperities. In this study, we formulate a 3-D subduction plate boundary model with two types of small asperities chained along the trench at the depth of 30 km. Our simulation succeeds in representing various types of slow earthquakes including low-frequency earthquakes and rapid slip velocity in the same asperity, and indicates that interaction between asperities may cause the very low-frequency earthquakes. Our simulation also shows chain reaction along trench with propagation speed that can be made consistent with observations by adjusting model parameters, which suggests that the interactions also explain the observed migration of slow earthquakes.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.gr.2009.03.006DOIArticle
ORCID:
AuthorORCID
Ampuero, Jean-Paul0000-0002-4827-7987
Additional Information:© 2009 International Association for Gondwana Research. Published by Elsevier B.V. Received 15 November 2008; revised 6 March 2009; accepted 7 March 2009. Available online 27 March 2009. Discussion with Dr. Bunichiro Shibazaki was useful to sharpen the target of our simulation. Dr. Kazushige Obara kindly taught us the details of observed low-frequency earthquake behaviors. We thank two reviewers for constructive comments and Dr. M. Santosh and Dr. S. Maruyama for expeditious editorial handling. This study used the Earth Simulator for our simulations, and the supercomputing resources at Cyberscience Center of Tohoku University for running experimental simulation to improve program codes. This work is supported by DONET program of the Ministry of Education, Culture, Sports, Science and Technology. GMT software (Wessel and Smith, 1998) was used to draw some figures.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
Tohoku UniversityUNSPECIFIED
Ministry of Education, Culture, Sports, Science and Technology (MEXT)DONET
Subject Keywords:Non-volcanic deep low-frequency tremors; Slow slip events; Rupture propagation process; Chain reaction; Rate and state dependent friction law
Issue or Number:3-4
Record Number:CaltechAUTHORS:20091103-105855916
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20091103-105855916
Official Citation:Keisuke Ariyoshi, Takane Hori, Jean-Paul Ampuero, Yoshiyuki Kaneda, Toru Matsuzawa, Ryota Hino, Akira Hasegawa, Influence of interaction between small asperities on various types of slow earthquakes in a 3-D simulation for a subduction plate boundary, Gondwana Research, Volume 16, Issues 3-4, December 2009, Pages 534-544, ISSN 1342-937X, DOI: 10.1016/j.gr.2009.03.006. (http://www.sciencedirect.com/science/article/B7XNB-4VXTSWB-2/2/b60460a8a08f204cc0ca27a26a46563a)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:16557
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:04 Nov 2009 22:06
Last Modified:03 Oct 2019 01:13

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