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  1. 防災科研関係論文

Rupture process of the 2011 Tohoku-Oki mega-thrust earthquake (M9.0) inverted from strong-motion data

https://nied-repo.bosai.go.jp/records/4549
https://nied-repo.bosai.go.jp/records/4549
f5f5243b-1360-44fa-9107-32e8c2c37423
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Rupture process of the 2011 Tohoku-Oki mega-thrust earthquake (M9.0) inverted from strong-motion data
言語
言語 eng
著者 Wataru Suzuki

× Wataru Suzuki

en Wataru Suzuki

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Shin Aoi

× Shin Aoi

en Shin Aoi

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Haruko Sekiguchi

× Haruko Sekiguchi

en Haruko Sekiguchi

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Takashi Kunugi

× Takashi Kunugi

en Takashi Kunugi

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抄録
内容記述タイプ Other
内容記述 We investigate the rupture process of the M9.0 Tohoku-Oki mega-thrust earthquake using the relatively low-frequency strong-motion records (0.01-0.125 Hz) observed at 36 K-NET and KiK-net stations, the epicentral distances of which range from 120 km to 400 km. The fault model is a rectangular plane, the length and width of which are 510 km along the Japan Trench and 210 km along subducting direction of the Pacific Plate, respectively. We perform the multi-time-window inversion analysis with a 30 × 30 km^2 subfault. The derived slip model has one large slip area. This area extends from the region around the hypocenter to the shallow part of the fault plane and further to the north and south along the trench axis, located far off southern Iwate, Miyagi, and northern Fukushima prefectures. The seismic moment is 4.42 × 10^22 Nm (Mw
9.0) and the maximum slip is 48 m. The slips near the coast are relatively small, except off Miyagi prefecture, which experienced a slip greater than 5 m. The shallow large slip area, which continuously ruptured from 60 s to 100 s after the initial break, radiated seismic waves rich in very-low-frequency content (<0.02 Hz). The rupture after 100 s propagating to the southern fault area, contributes to the distinct phases observed for Fukushima and Ibaraki prefectures. The relationship between the proposed rupture model and the feature of the acceleration waveforms is not straightforward and suggests the frequency dependency of the seismic wave radiation. c 2011 by the American Geophysical Union.
言語 en
書誌情報 en : Geophysical Research Letters

巻 38, 号 20, p. n/a-n/a, 発行日 2011-04-01
出版者
言語 en
出版者 Blackwell Publishing Ltd
ISSN
収録物識別子タイプ ISSN
収録物識別子 0094-8276
DOI
関連識別子 10.1029/2011GL049136
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