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  1. 防災科研関係論文

Monitoring of seismic anisotropy at the time of the 2008 Iwate-Miyagi (Japan) earthquake

https://nied-repo.bosai.go.jp/records/4689
https://nied-repo.bosai.go.jp/records/4689
ab819d6a-5f4e-484d-80e4-baf1b15ad1fd
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Monitoring of seismic anisotropy at the time of the 2008 Iwate-Miyagi (Japan) earthquake
言語
言語 eng
著者 M. Saade

× M. Saade

en M. Saade

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J. P. Montagner

× J. P. Montagner

en J. P. Montagner

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P. Roux

× P. Roux

en P. Roux

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K. Shiomi

× K. Shiomi

en K. Shiomi

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B. Enescu

× B. Enescu

en B. Enescu

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F. Brenguier

× F. Brenguier

en F. Brenguier

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抄録
内容記述タイプ Other
内容記述 We investigate temporal variations of the polarization anomaly of surface waves (Rayleigh and Love) relative to an isotropic medium, before and after the 2008 June 13, Iwate-Miyagi Nairiku earthquake (M-w = 6.9) in Japan, using passive image interferometry. We use continuous data records of 20 high-sensitivity three-component seismic stations (National Institute for Earth Sciences and Disaster Resilience-NIED Hi-net) from mid-2007 to the end of 2009. We compute cross-correlations of ambient seismic noise between each pair of stations, in the frequency range of 0.08-0.22 Hz. The temporal variations of the surface wave polarization show slow and weak variations due to seasonal changes to which rapid and strong variations are superposed at the time of the earthquake, and more surprisingly, also a month and a half before the earthquake. Strong changes in the polarization of surface waves might be related to changes in the distribution of crack orientation affecting seismic anisotropy.
言語 en
書誌情報 en : GEOPHYSICAL JOURNAL INTERNATIONAL

巻 211, 号 1, p. 483-497, 発行日 2017-10
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 10.1093/gji/ggx321
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