Seismic evidence for reactivation of a buried hydrated fault in the Pacific slab by the 2011 M9.0 Tohoku earthquake

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  • Junichi Nakajima
    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
  • Saeko Kita
    Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science; Tohoku University; Sendai Japan

書誌事項

タイトル別名
  • HYDRATED FAULT AND INTRASLAB EARTHQUAKES
公開日
2011-04
資源種別
journal article
権利情報
  • http://doi.wiley.com/10.1002/tdm_license_1.1
DOI
  • 10.1029/2011gl048432
  • 10.1029/2011gl048754
公開者
American Geophysical Union (AGU)

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説明

[1] We determine the focal mechanisms of earthquakes within the Philippine Sea slab beneath the Tokyo metropolitan area, and perform stress tensor inversions to investigate the detailed stress field within the slab. The results show a characteristic spatial variation in earthquake-generating stress. Slab stress in northeastern part of the PHS slab is characterized by down-dip tension (DDT), except for the uppermost tip of the seismic portion of the slab where down-dip compression (DDC) stress is dominant. We interpret that DDT is caused by the net slab pull and DDC is attributable to local resistance to subduction at the tip of the slab. In southwestern part of the PHS slab, σ1 and σ3 are generally rotated oblique to the dip of the slab, suggesting that earthquakes occur under stress conditions of neither DDC nor DDT. The rotations in σ1 and σ3 may be related to stress accumulation by the slip deficit along the asperity of the 1923 Kanto earthquake (M7.9).

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