UTokyo Repository 東京大学

UTokyo Repository >
131 地震研究所 >
東京大学地震研究所彙報 >

このページ(論文)をリンクする場合は次のURLを使用してください: http://hdl.handle.net/2261/13204

タイトル: 1998年9月15日仙台市で発生した地震(M5.0)の余震データに基づく応力場の推定
その他のタイトル: Estimation of stress tensor using aftershocks of 15 September 1998 M 5.0 Sendai, NE Japan, earthquake
著者: 伊藤, 喜宏
岡田, 知己
松澤, 暢
海野, 徳仁
長谷川, 昭
著者(別言語): Ito, Yoshihiro
Okada, Tomomi
Matsuzawa, Toru
キーワード: stress field
moment tensor inversion
empirical Green's tensor derivatives
stress tensor inversion
発行日: 2001年7月25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76冊第1号, 2001.7.25, pp. 51-59
抄録: We estimated stress tensor in the focal area of M5.0 earthquake that occurred on 15 September, 1998, in Sendai city, NE Japan. Many aftershock focal mechanism solutions, which cannot be determined by P wave polarity data alone, were obtained by moment tensor inversion using empirical Green's tensor derivatives. The result of stress tensor inversion based on these mechanism solutions shows that the maximum principal axis of the stress tensor is perpendicular to the strike of Nagamachi-Rifu fault and is consistent with the P axis of the main shock. We found a tendency that events with relatively large mis-fit of slip direction are located around the area with a large slip by the main shock rupture. Stress tensor inversions for 16 subdivided areas show that stress ratio R = (σ1-σ2)/(σ1-σ3) approaches to zero in areas where the slip caused by the main shock rupture is small and aftershock activity is high. These facts suggest local stress field perturbations caused by the slip of the main shock.
URI: http://hdl.handle.net/2261/13204
ISSN: 00408972


ファイル 記述 サイズフォーマット
ji0761005.pdf781.93 kBAdobe PDF見る/開く



Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - ご意見をお寄せください