Tidal Response in Shallow Tectonic Tremors

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  • S. Katakami
    Division of Earth and Planetary Sciences Kyoto University Kyoto Japan
  • Y. Yamashita
    Disaster Prevention Research Institute Kyoto University Kyoto Japan
  • H. Yakiwara
    Nansei‐Toko Observatory for Earthquakes and Volcanoes, Graduate School of Science and Engineering Kagoshima University Kagoshima Japan
  • H. Shimizu
    Institute of Seismology and Volcanology (SEVO), Faculty of Sciences Kyushu University Shimabara Japan
  • Y. Ito
    Disaster Prevention Research Institute Kyoto University Kyoto Japan
  • K. Ohta
    Disaster Prevention Research Institute Kyoto University Kyoto Japan

書誌事項

公開日
2017-10-13
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/2017gl074060
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>Various types of slow earthquakes (e.g., tectonic tremors and slow slip events) have been reported in tectonic zones, especially in the subduction zone. The tidal response of a tremor is considered to be strongly related to the weak friction state of the plate interface, and many studies have reported observational evidence of such correlation between tides and deep tremor activity. Here we used the modified frequency scanning method at a single station to detect micro tectonic tremors that have not been previously reported in southern Kyushu. In the early stage of the tremor activity, tremors are mostly modulated by slow slip events. In contrast, we found a seismic response to ocean tides during the later stage in the shallower part of the subduction zone. This might indicate that the tremors are triggered by tidal changes caused by fault weakening due to slow slip events as same as deeper condition.</jats:p>

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