内陸地震発生の直前に地質構造帯に沿って現われる地震活動の前兆的静穏化

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タイトル別名
  • Precursory Seismic Quiescence Appearing along Tectonic Zone Just before the Occurrence of Intraplate Earthquake.
  • ナイリク ジシン ハッセイ ノ チョクゼン ニ チシツ コウゾウタイ ニ ソッ

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抄録

Several examples are presented which seismic quiescence appeared in a wide area around the foci of intraplate earthquakes before their occurrence. A noteworthy feature is that the quiescence area extends along tectonic zones over more than several times of the focal region of the main shock. This phenomenon suggests that stress in a wide area along tectonic zones changes before the occurrence of major intraplate earthquake. We consider that the stress change is a manifestation of a significant physical process leading to earthquake occurrence. An apparently puzzling fact which earthquake precursors are sometimes observed at distant places from the focal region in the specific direction may be explained by such stress change. Further, it is expected that the precursory seismic quiescence provides us with a promising clue to the short-term prediction of intraplate earthquake.

収録刊行物

  • 地学雑誌

    地学雑誌 105 (1), 77-87, 1996

    公益社団法人 東京地学協会

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