Seismic velocity structure in the source region of the 2016 Kumamoto earthquake sequence, Japan

DOI Web Site Web Site 被引用文献12件 参考文献18件 オープンアクセス
  • Azusa Shito
    Institute of Seismology and Volcanology Kyushu University Fukuoka Japan
  • Satoshi Matsumoto
    Institute of Seismology and Volcanology Kyushu University Fukuoka Japan
  • Hiroshi Shimizu
    Institute of Seismology and Volcanology Kyushu University Fukuoka Japan
  • Takahiro Ohkura
    Aso Volcanological Laboratory, Institute for Geothermal Sciences, Graduate School of Science Kyoto University Aso Kumamoto Japan
  • Hiroaki Takahashi
    Institute of Seismology and Volcanology Hokkaido University Sapporo Japan
  • Shinichi Sakai
    Earthquake Research Institute University of Tokyo Tokyo Japan
  • Tomomi Okada
    Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science Tohoku University Sendai Japan
  • Hiroki Miyamachi
    Graduate School of Science and Engineering Kagoshima University Kagoshima Japan
  • Masahiro Kosuga
    Graduate School of Science and Technology Hirosaki University Hirosaki Japan
  • Yuta Maeda
    Earthquake and Volcano Research Center, Graduate School of Environmental Studies Nagoya University Nagoya Japan
  • Masayuki Yoshimi
    Geological Survey of Japan Advanced Industrial Science and Technology Tsukuba Japan
  • Youichi Asano
    National Research Institute for Earth Science and Disaster Resilience Tsukuba Japan
  • Makoto Okubo
    Kochi Earthquake Observatory, Faculty of Science and Technology Kochi University Kochi Japan

書誌事項

公開日
2017-08-12
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/2017gl074593
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>We investigate seismic wave velocity structure and spatial distribution of the seismicity in the source region of the 2016 Kumamoto earthquake sequence. A one‐dimensional mean velocity shows that the seismogenic zone has a high‐velocity and low‐Vp/Vs ratio relative to the average velocity structure of Kyushu Island. This indicates that the crust is relatively strong, capable of sustaining sufficiently high strain energy to facilitate two large (<jats:italic>M</jats:italic><jats:sub><jats:italic>j</jats:italic></jats:sub> > 6.5) earthquakes in close proximity to one another in rapid succession. Three‐dimensional tomography of the seismogenic zone around the source of the 2016 Kumamoto earthquake sequence yields Vp = 6 km/s and Vs = 3.5 km/s. Most large‐displacement areas (asperities) of the <jats:italic>M</jats:italic><jats:sub><jats:italic>j</jats:italic></jats:sub> 7.3 event overlap with the seismogenic zone and the overlying surface layer. Aftershock seismicity is distributed deeper than the conventional seismogenic zone, which suggests decreased strength due to fluids or increased stress, both caused by coseismic slip.</jats:p>

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