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  1. 防災科研関係論文

Strong localized asperity of the 2011 Tohoku-Oki earthquake, Japan

https://nied-repo.bosai.go.jp/records/3924
https://nied-repo.bosai.go.jp/records/3924
b9477548-2329-42e3-8865-66c491d0ada8
Item type researchmap(1)
公開日 2023-04-27
タイトル
言語 ja
タイトル Strong localized asperity of the 2011 Tohoku-Oki earthquake, Japan
タイトル
言語 en
タイトル Strong localized asperity of the 2011 Tohoku-Oki earthquake, Japan
言語
言語 eng
著者 Hiroyuki Kumagai

× Hiroyuki Kumagai

ja Hiroyuki Kumagai

en Hiroyuki Kumagai

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Nelson Pulido

× Nelson Pulido

ja Nelson Pulido

en Nelson Pulido

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Eiichi Fukuyama

× Eiichi Fukuyama

ja Eiichi Fukuyama

en Eiichi Fukuyama

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Shin Aoi

× Shin Aoi

ja Shin Aoi

en Shin Aoi

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抄録
内容記述タイプ Other
内容記述 Our moment tensor inversion of the 2011 Tohoku-Oki earthquake, using regional broadband strong-motion waveforms, indicates that the earthquake can be approximated by a point source. The amplitude spectra of the observed displacement seismograms were fitted by the omega-square model, which resulted in the corner frequency of around 0.016 Hz. This implies a large slip over a circular fault having a radius of 70 km, with a rupture duration of about 40 s. The moment-rate function estimated from the inversion shows a large impulse of similar duration. We interpret this impulse to correspond to the rupture estimated from the corner frequency. From the seismic moment released during the impulse, we have estimated the average slip and stress drop over the fault to be 50 m and 40 MPa, respectively. This stress drop corresponds to an effective normal stress larger than 200 MPa, indicating that a strong localized asperity (mega asperity) was ruptured during the earthquake. Previous simulation studies suggested the importance of a large effective normal stress at a shallow plate interface, which was explained by a pore pressure distribution along the plate. We have explored the possibility of a subducted seamount to be the origin of the mega asperity. Copyright © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS).
言語 en
書誌情報 ja : Earth, Planets and Space
en : Earth, Planets and Space

巻 64, 号 7, p. 649-654, 発行日 2012
出版者
言語 en
出版者 Springer Berlin
ISSN
収録物識別子タイプ ISSN
収録物識別子 1880-5981
DOI
関連識別子 10.5047/eps.2012.01.004
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