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  1. 防災科研関係論文

Tectonic tremors immediately after the 2011 Tohoku-Oki earthquake detected by near-trench seafloor seismic observations

https://nied-repo.bosai.go.jp/records/3135
https://nied-repo.bosai.go.jp/records/3135
e7e7bcc1-48dd-4a47-9a43-78f9e49430a5
Item type researchmap(1)
公開日 2023-04-27
タイトル
言語 en
タイトル Tectonic tremors immediately after the 2011 Tohoku-Oki earthquake detected by near-trench seafloor seismic observations
言語
言語 eng
著者 Hidenobu Takahashi

× Hidenobu Takahashi

en Hidenobu Takahashi

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Ryota Hino

× Ryota Hino

en Ryota Hino

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Naoki Uchida

× Naoki Uchida

en Naoki Uchida

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Takanori Matsuzawa

× Takanori Matsuzawa

en Takanori Matsuzawa

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Yusaku Ohta

× Yusaku Ohta

en Yusaku Ohta

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Syuichi Suzuki

× Syuichi Suzuki

en Syuichi Suzuki

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Masanao Shinohara

× Masanao Shinohara

en Masanao Shinohara

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抄録
内容記述タイプ Other
内容記述 Abstract

Temporal seismic observations from pop-up type ocean-bottom seismometers were used to detect tectonic tremors immediately following the 2011 Tohoku-Oki earthquake in the northern periphery of the aftershock area. Near-field observations clearly distinguished tremors from regular earthquakes based on their spectral shape in the frequency band of 1–4 Hz. In addition to tremors accompanied by very low-frequency earthquakes (VLFEs), we detected 130 tremors without known VLFE activity during April–October 2011. The newly detected tremors were in the vicinity of a sequence of small repeating earthquakes, indicating a mixed distribution of tremors and regular interplate earthquakes in the region. Tremor activity was high immediately after the deployment of seismometers and gradually decreased. In addition, the tremor activity fluctuated with two activations with an interval of approximately 90 days, similar to the intervals between tremor bursts after 2016. The results of the study suggest that the observed tremors occurred under the influence of aseismic slip caused by the decaying afterslip of the preceding Tohoku-Oki and Mw 7.4 interplate earthquakes and episodic accelerations with a quasi-periodicity unique to the area.
言語 en
書誌情報 en : Progress in Earth and Planetary Science

巻 9, 号 1, p. 1-14, 発行日 2022-12-07
出版者
言語 en
出版者 Springer Science and Business Media LLC
ISSN
収録物識別子タイプ EISSN
収録物識別子 2197-4284
DOI
関連識別子 10.1186/s40645-022-00525-z
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