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  1. 防災科研関係論文

Offshore seismicity in the western Marmara Sea, Turkey, revealed by ocean bottom observation

https://nied-repo.bosai.go.jp/records/5048
https://nied-repo.bosai.go.jp/records/5048
d82c8e26-adf0-4863-b37d-47b076fd7a37
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Offshore seismicity in the western Marmara Sea, Turkey, revealed by ocean bottom observation
言語
言語 eng
著者 Yojiro Yamamoto

× Yojiro Yamamoto

en Yojiro Yamamoto

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Narumi Takahashi

× Narumi Takahashi

en Narumi Takahashi

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Seckin Citak

× Seckin Citak

en Seckin Citak

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Dogan Kalafat

× Dogan Kalafat

en Dogan Kalafat

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Ali Pinar

× Ali Pinar

en Ali Pinar

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Cemil Gurbuz

× Cemil Gurbuz

en Cemil Gurbuz

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Yoshiyuki Kaneda

× Yoshiyuki Kaneda

en Yoshiyuki Kaneda

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抄録
内容記述タイプ Other
内容記述 The faults' geometry and their seismic activity beneath the Marmara Sea have been under debate for a couple of decades. We used data recorded by three ocean bottom seismographs (OBSs) over a period of 3 months in 2014 to investigate the relationship of fault geometry to microseismicity under the western Marmara Sea in Turkey. We detected a seismic swarm at 13 to 20 km depth beneath the main Marmara fault (MMF), and the maximum depth of seismogenic zone was 25 km within the OBS observation area. These results provided evidence that the dip of the MMF is almost vertical and that the seismogenic zone in this region extends into the lower crust. Our analysis of past seismicity indicated that the seismic swarm we recorded is the most recent of an episodic series of seismic activity with an average recurrence interval of 2-3 years. The repetitive seismicity indicates that the MMF beneath the western Marmara Sea is coupled and that some of the accumulated strain is released every 2 to 3 years. Our study shows that OBS data can provide useful information about seismicity along the MMF, but more extensive studies using more OBSs deployed over a wider area are needed to fully understand the fault geometry and stick-slip behavior of faults under the Marmara Sea.
言語 en
書誌情報 en : EARTH PLANETS AND SPACE

巻 67
出版者
言語 en
出版者 SPRINGER HEIDELBERG
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 10.1186/s40623-015-0325-9
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