Temporal Activity Modulation of Deep Very Low Frequency Earthquakes in Shikoku, Southwest Japan

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  • Satoru Baba
    Earthquake Research Institute University of Tokyo Tokyo Japan
  • Akiko Takeo
    Earthquake Research Institute University of Tokyo Tokyo Japan
  • Kazushige Obara
    Earthquake Research Institute University of Tokyo Tokyo Japan
  • Aitaro Kato
    Earthquake Research Institute University of Tokyo Tokyo Japan
  • Takuto Maeda
    Earthquake Research Institute University of Tokyo Tokyo Japan
  • Takanori Matsuzawa
    National Research Institute for Earth Science and Disaster Resilience Tsukuba Japan

書誌事項

公開日
2018-01-26
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/2017gl076122
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>We investigated long‐term changes in the activity of deep very low frequency earthquakes (VLFEs) in western Shikoku, southwest part of the Nankai subduction zone in Japan for 13 years by the matched‐filter technique. VLFE activity is expected to be a proxy of interplate slips. In the Bungo channel, where long‐term slow slip events (SSEs) occurred frequently, the cumulative number of detected VLFEs increased rapidly in 2010 and 2014, which were modulated by long‐term SSEs. In the neighboring inland region near the Bungo channel, the cumulative number increased steeply every 6 months. This stepwise change was accompanied by episodic tremors and slips. Deep VLFE activity in western Shikoku has been low since the latter half of 2014. This decade‐scale quiescence may be attributed to the change in interplate coupling strength in the Nankai subduction zone.</jats:p>

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