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タイトル: Spectral Features of Foreshocks.
その他のタイトル: 前震のスペクトル的特徴
著者: 辻浦, 賢
著者(別言語): Tsujiura, Masaru
発行日: 1978年3月31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52冊第3/4号, 1978.3.31, pp. 357-371
抄録: In order to obtain the spectral features of foreshocks in comparison with other events, the spectrum of body waves for three moderatesized earthquake sequences (M>5.4) which were preceded by a considerable number of foreshocks are studied in terms of source parameters. The results obtained here show that the spectrum of the main foreshock is somewhat different from the other events in each region although the relation is not simple. The stress drop of the main foreshock is lower by a factor of about 1/5 than the main shock and major aftershocks (eastern part of Yamanashi pref., 1976) or aftershocks (Kawazu, Izu peninsula, 1976), while the foreshock of Hawaii (1975) shows a relatively higher stress drop compared with the main shock and the shocks in normal activity.
URI: http://hdl.handle.net/2261/12642
ISSN: 00408972


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