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  1. 防災科研関係論文

Imaging an asperity of the 2003 Tokachi-oki earthquake using a dense strong-motion seismograph network

https://nied-repo.bosai.go.jp/records/2965
https://nied-repo.bosai.go.jp/records/2965
7a682323-1e9a-4be9-8e09-21414b1017d9
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Imaging an asperity of the 2003 Tokachi-oki earthquake using a dense strong-motion seismograph network
言語
言語 eng
著者 R. Honda

× R. Honda

en R. Honda

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S. Aoi

× S. Aoi

en S. Aoi

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H. Sekiguchi

× H. Sekiguchi

en H. Sekiguchi

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H. Fujiwara

× H. Fujiwara

en H. Fujiwara

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抄録
内容記述タイプ Other
内容記述 The 2003 Tokachi-oki earthquake ruptured a large area of approximately 100 km(2). The location of the largest asperity was estimated to be several dozen kilometres offshore of Hokkaido, Japan. The magnitude measured 8.0 on the Japan Meteorological Agency scale, and several studies used waveform inversion analysis to estimate the moment-magnitude as M-w 8.0-8.2. Several studies reported that there was a minor asperity at the northeastern edge of the fault plane, and that the rupture velocity towards the minor asperity was less than that towards the main asperity. One of them illustrated that the location and timing of the minor asperity were poorly constrained. In this paper, we introduce a procedure based on semblance analysis to image the location of the minor northeastern asperity with improved resolution. We group 15 strong-motion seismographs into three arrays, and we perform semblance analysis on impulsive waves that were possibly generated from the minor asperity and were conspicuously observed at stations in eastern Hokkaido. By projecting the semblance values onto the fault plane, we estimate the location of the minor asperity. We find it to be shallower and farther from the coast than the previous results indicated. The average rupture velocity towards the asperity is estimated to be 2.5 km s(-1), which is slower than the 3.6 km s(-1) obtained by waveform inversion analysis.
言語 en
書誌情報 en : GEOPHYSICAL JOURNAL INTERNATIONAL

巻 172, 号 3, p. 1104-1116, 発行日 2008-03
出版者
言語 en
出版者 OXFORD UNIV PRESS
ISSN
収録物識別子タイプ EISSN
収録物識別子 1365-246X
DOI
関連識別子 10.1111/j.1365-246X.2007.03702.x
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