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  1. 防災科研関係論文

Spatio-temporal changes in the seismic velocity induced by the 2011 Tohoku-Oki earthquake and slow slip event revealed from seismic interferometry, using ocean bottom seismometer’s records

https://nied-repo.bosai.go.jp/records/3130
https://nied-repo.bosai.go.jp/records/3130
6172b70e-8396-46fd-ac72-2f823b6e62c8
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 ja
タイトル Spatio-temporal changes in the seismic velocity induced by the 2011 Tohoku-Oki earthquake and slow slip event revealed from seismic interferometry, using ocean bottom seismometer’s records
タイトル
言語 en
タイトル Spatio-temporal changes in the seismic velocity induced by the 2011 Tohoku-Oki earthquake and slow slip event revealed from seismic interferometry, using ocean bottom seismometer's records
言語
言語 eng
著者 Uemura, M

× Uemura, M

ja Uemura, M

en Miyuu Uemura

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Y. Ito

× Y. Ito

ja Y. Ito

en Yoshihiro Ito

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K. Ohta

× K. Ohta

ja K. Ohta

en Kazuaki Ohta

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R. Hino

× R. Hino

ja R. Hino

en Ryota Hino

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M. Shinohara

× M. Shinohara

ja M. Shinohara

en Masanao Shinohara

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抄録
内容記述タイプ Other
内容記述 Seismic interferometry is one of the most effective techniques for detecting temporal variations in seismic velocity caused by large earthquakes. Before the 2011 Tohoku-Oki earthquake (M(w)9.0) near the Japan Trench, a slow slip event (SSE, M(w)7.0) and low-frequency tremors were observed near the trench. Here, we applied a seismic interferometry technique using ambient noise to data from 17 ocean bottom seismometers (OBSs) installed above the focal region before the main shock. We used our technique to detect temporal variations in seismic velocity caused by the main shock, SSE, and low-frequency tremors. In the region above the large coseismic slip area, we detected a 1-2% seismic velocity decrease after the main shock. In addition, we observed very small temporal increases in seismic velocity near the SSE fault during the initial SSE stage. Moreover, for most of the OBSs, we observed temporal variations in the autocorrelation functions (ACFs) during the low-frequency tremors. These may have been caused by temporal variations in the ambient noise source distributions, resulting from low-frequency tremors. These results suggest the possibility of detecting low-frequency tremors using ACF monitoring.
言語 en
書誌情報 ja : Prog. Earth Planet. Sci.
en : PROGRESS IN EARTH AND PLANETARY SCIENCE

巻 5, 発行日 2018-12
出版者
言語 en
出版者 SPRINGEROPEN
ISSN
収録物識別子タイプ ISSN
収録物識別子 2197-4284
DOI
関連識別子 10.1186/s40645-018-0240-3
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