Characteristic small‐earthquake sequence off Sanriku, northeastern Honshu, Japan

Toru Matsuzawa, Toshihiro Igarashi, Akira Hasegawa

doi:10.1029/2001gl014632

Characteristic small‐earthquake sequence off Sanriku, northeastern Honshu, Japan

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Toru Matsuzawa

Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science Tohoku University Sendai Japan
Toshihiro Igarashi

Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science Tohoku University Sendai Japan
Akira Hasegawa

Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science Tohoku University Sendai Japan

書誌事項

公開日: 2002-06

権利情報

http://onlinelibrary.wiley.com/termsAndConditions#vor

DOI

10.1029/2001gl014632

公開者: American Geophysical Union (AGU)

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説明

<jats:p>We found eight similar earthquakes of <jats:italic>M</jats:italic>4.8 regularly occurring from 1957 to 1995 on the plate boundary off Sanriku, northeastern Japan. The mean recurrence interval of the events is 5.35 years and its standard deviation is only 0.53 years. These events have the same focal mechanisms of low‐angle thrust fault type and their source sizes are estimated to be around 1 km. The slip of each event is comparable to the cumulative amount of relative plate motion in the inter‐seismic period. Thus, these events are probably caused by repeating slip at a small but strong asperity surrounded by creeping zone on the plate boundary. The next event was expected to occur by the end of November 2001 with 99% probability and actually <jats:italic>M</jats:italic>4.7 event occurred on November 13, 2001.</jats:p>