Comprehensive Detection of Very Low Frequency Earthquakes Off the Hokkaido and Tohoku Pacific Coasts, Northeastern Japan

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  • Satoru Baba
    Earthquake Research Institute The University of Tokyo Tokyo Japan
  • Akiko Takeo
    Earthquake Research Institute The University of Tokyo Tokyo Japan
  • Kazushige Obara
    Earthquake Research Institute The University of Tokyo Tokyo Japan
  • Takanori Matsuzawa
    National Research Institute for Earth Science and Disaster Resilience Ibaraki Japan
  • Takuto Maeda
    Graduate School of Science and Technology Hirosaki University Aomori Japan

書誌事項

公開日
2020-01
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2019jb017988
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>Very low frequency earthquakes (VLFEs), classified as one type of slow earthquake, occur near seismogenic zones and can be a proxy for interplate slow slip. We investigated VLFE activity off the Hokkaido and Tohoku Pacific coasts, where the Pacific plate subducts under the North American plate. Comprehensive detection of VLFEs is performed for the period from January 2003 to July 2018 by a matched‐filter technique utilizing synthetic waveforms calculated based on a three‐dimensional velocity structure model. The spatiotemporal consistency between the afterslip of the 2003 Tokachi‐Oki earthquake (Mw 8.0) and VLFE distribution off the Hokkaido coast suggests that VLFE activity can reflect interplate slow slip. Inside a large coseismic slip area of the 2011 Tohoku earthquake (Mw 9.0), the VLFE activity was low thereafter, whereas outside the area, VLFE activity increased after the 2011 Tohoku earthquake. These characteristics are consistent with aseismic slip distributions estimated from repeating earthquakes. VLFEs were sometimes activated by afterslips of interplate earthquakes with Mw of 6–7, such as the 2008 Fukushima‐Oki earthquake and aftershocks of the 2011 Tohoku earthquake. Even in the coseismic slip areas of very large earthquakes, we found the occurrence of episodic bursts every 3 months to a year during an interseismic period between very large earthquakes. Such VLFE bursts may suggest small slips during the interseismic period.</jats:p>

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