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https://hdl.handle.net/20.500.14094/90006507
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2024-05-22
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メタデータID
90006507
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open access
出版タイプ
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タイトル
Configuration and structure of the Philippine Sea Plate off Boso, Japan: constraints on the shallow subduction kinematics, seismicity, and slow slip events
著者
Ito, Aki ; Tonegawa, Takashi ; Uchida, Naoki ; Yamamoto, Yojiro ; Suetsugu, Daisuke ; Hino, Ryota ; Sugioka, Hiroko ; Obana, Koichiro ; Nakahigashi, Kazuo ; Shinohara, Masanao
著者名
Ito, Aki
著者名
Tonegawa, Takashi
著者名
Uchida, Naoki
著者名
Yamamoto, Yojiro
著者名
Suetsugu, Daisuke
著者名
Hino, Ryota
著者ID
A0743
研究者ID
1000000359184
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=1b8c37d273204c78520e17560c007669
著者名
Sugioka, Hiroko
杉岡, 裕子
スギオカ, ヒロコ
所属機関名
理学研究科
著者名
Obana, Koichiro
著者名
Nakahigashi, Kazuo
著者名
Shinohara, Masanao
収録物名
Earth, Planets and Space
巻(号)
71(1)
ページ
111-111
出版者
SpringerOpen
刊行日
2019-10-25
公開日
2019-11-18
抄録
We applied tomographic inversion and receiver function analysis to seismic data from ocean-bottom seismometers and land-based stations to understand the structure and its relationship with slow slip events off Boso, Japan. First, we delineated the upper boundary of the Philippine Sea Plate based on both the velocity structure and the locations of the low-angle thrust-faulting earthquakes. The upper boundary of the Philippine Sea Plate is distorted upward by a few kilometers between 140.5 and 141.0°E. We also determined the eastern edge of the Philippine Sea Plate based on the delineated upper boundary and the results of the receiver function analysis. The eastern edge has a northwest–southeast trend between the triple junction and 141.6°E, which changes to a north–south trend north of 34.7°N. The change in the subduction direction at 1–3 Ma might have resulted in the inflection of the eastern edge of the subducted Philippine Sea Plate. Second, we compared the subduction zone structure and hypocenter locations and the area of the Boso slow slip events. Most of the low-angle thrust-faulting earthquakes identified in this study occurred outside the areas of recurrent Boso slow slip events, which indicates that the slow slip area and regular low-angle thrust earthquakes are spatially separated in the offshore area. In addition, the slow slip areas are located only at the contact zone between the crustal parts of the North American Plate and the subducting Philippine Sea Plate. The localization of the slow slip events in the crust–crust contact zone off Boso is examined for the first time in this study. Finally, we detected a relatively low-velocity region in the mantle of the Philippine Sea Plate. The low-velocity mantle can be interpreted as serpentinized peridotite, which is also found in the Philippine Sea Plate prior to subduction. The serpentinized peridotite zone remains after the subduction of the Philippine Sea Plate and is likely distributed over a wide area along the subducted slab.
キーワード
Subducted Philippine Sea Plate
Slow slip events
Seismic structure from amphibious array
Off-Boso area
カテゴリ
理学研究科
学術雑誌論文
権利
© The Author(s) 2019.
This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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資源タイプ
journal article
言語
English (英語)
ISSN
1343-8832
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eISSN
1880-5981
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NCID
AA11211921
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関連情報
DOI
https://doi.org/10.1186/s40623-019-1090-y
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