論文

査読有り
2012年9月

Recurrent slow slip event likely hastened by the 2011 Tohoku earthquake

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
  • Hitoshi Hirose
  • ,
  • Hisanori Kimura
  • ,
  • Bogdan Enescu
  • ,
  • Shin Aoi

109
38
開始ページ
15157
終了ページ
15161
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1073/pnas.1202709109
出版者・発行元
NATL ACAD SCIENCES

Slow slip events (SSEs) are another mode of fault deformation than the fast faulting of regular earthquakes. Such transient episodes have been observed at plate boundaries in a number of subduction zones around the globe. The SSEs near the Boso Peninsula, central Japan, are among the most documented SSEs, with the longest repeating history, of almost 30 y, and have a recurrence interval of 5 to 7 y. A remarkable characteristic of the slow slip episodes is the accompanying earthquake swarm activity. Our stable, long-term seismic observations enable us to detect SSEs using the recorded earthquake catalog, by considering an earthquake swarm as a proxy for a slow slip episode. Six recurrent episodes are identified in this way since 1982. The average duration of the SSE interoccurrence interval is 68 mo; however, there are significant fluctuations from this mean. While a regular cycle can be explained using a simple physical model, the mechanisms that are responsible for the observed fluctuations are poorly known. Here we show that the latest SSE in the Boso Peninsula was likely hastened by the stress transfer from the March 11, 2011 great Tohoku earthquake. Moreover, a similar mechanism accounts for the delay of an SSE in 1990 by a nearby earthquake. The low stress buildups and drops during the SSE cycle can explain the strong sensitivity of these SSEs to stress transfer from external sources.

リンク情報
DOI
https://doi.org/10.1073/pnas.1202709109
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000309211000026&DestApp=WOS_CPL
URL
http://orcid.org/0000-0003-2153-0097
ID情報
  • DOI : 10.1073/pnas.1202709109
  • ISSN : 0027-8424
  • ORCIDのPut Code : 13011468
  • Web of Science ID : WOS:000309211000026
  • ORCIDで取得されたその他外部ID : a:1:{i:0;a:1:{s:8:"other-id";s:19:"WOS:000309211000026";}}

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