論文

2014年9月

Was the 2011 Tohoku-Oki earthquake preceded by aseismic preslip? Examination of seafloor vertical deformation data near the epicenter

MARINE GEOPHYSICAL RESEARCH
  • R. Hino
  • ,
  • D. Inazu
  • ,
  • Y. Ohta
  • ,
  • Y. Ito
  • ,
  • S. Suzuki
  • ,
  • T. Iinuma
  • ,
  • Y. Osada
  • ,
  • M. Kido
  • ,
  • H. Fujimoto
  • ,
  • Y. Kaneda

35
3
開始ページ
181
終了ページ
190
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1007/s11001-013-9208-2
出版者・発行元
SPRINGER

Ocean-bottom pressure records obtained near the epicenter of the 2011 Tohoku-Oki earthquake were examined to test whether the earthquake was preceded by substantial precursory crustal deformation. The seafloor data enabled us to search for small-scale preslip near the epicenter that would be difficult to identify from terrestrial geodetic data. After treating the data to reduce nontectonic fluctuations, we obtained a time series of seafloor vertical deformation in the epicentral region with a noise level of 2-4 cm. No significant crustal deformation related to preslip was detected in the period of roughly a day before the mainshock, whereas postseismic deformation associated with the largest foreshock 2 days before the mainshock was apparent. From our quantitative estimate of the sensitivity of the seafloor network in detecting slip on the plate interface, we conclude that the Tohoku-Oki earthquake was not preceded by preslip with moment release greater than moment magnitude (Mw) 6.2 in the vicinity of the hypocenter or greater than Mw 6.0 along the subduction interface near the trench.

リンク情報
DOI
https://doi.org/10.1007/s11001-013-9208-2
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000342214300002&DestApp=WOS_CPL
ID情報
  • DOI : 10.1007/s11001-013-9208-2
  • ISSN : 0025-3235
  • eISSN : 1573-0581
  • Web of Science ID : WOS:000342214300002

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