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タイトル: Precursory Quiescence and Recovery of Aftershock Activities before Some Large Aftershocks
その他のタイトル: 大きい余震の発生前の本震の余震活動度の異常
著者: 松浦, 律子
著者(別言語): Matsu'ura, Ritsuko S.
発行日: 1986年8月4日
出版者: 東京大学地震研究所
掲載誌情報: 東京大学地震研究所彙報. 第61冊第1号, 1986.8.4, pp. 1-65
抄録: Temporal features of the aftershock activities following some large shallow earthquakes of M>7 in Japan have been studied quantitatively. The earthquakes concerned were accompanied by large aftershocks which triggered their own aftershock activities. The purpose of the present study is to seek any anomalous change in aftershock activities of the main shock before the occurrence of such large aftershocks. Aftershock activity shows an appreciable decrease from the level expected from the modified Omori formula before the occurrence of a large aftershock. The aftershock activity then recovers to the normal level or evev increases beyond the normal level shortly before the occurrence of the large aftershock. The recovered activity generally occurs near the hypocenter of the forthcoming large aftershock. Such a feature has been recognized in fourteen cases out of eighteen for which sufficient data are available. We have the possibility of predicting the occurrence of a large aftershock which might be as large and disastrous as the main shock, if we keep watch on the change of the aftershock activity immediately following the main shock. Moreover, a rough prediction of the place can be made by checking the hypocenter location of aftershocks occuring in the recovered stage.
URI: http://hdl.handle.net/2261/12958
ISSN: 00408972


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