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  1. 防災科研関係論文

Lithosphere–asthenosphere boundary beneath the Sea of Japan from transdimensional inversion of S-receiver functions

https://nied-repo.bosai.go.jp/records/5096
https://nied-repo.bosai.go.jp/records/5096
e3d58ec1-1e9a-436e-ad08-3f407359bee6
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Lithosphere–asthenosphere boundary beneath the Sea of Japan from transdimensional inversion of S-receiver functions
著者 Takeshi Akuhara

× Takeshi Akuhara

en Takeshi Akuhara

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Kazuo Nakahigashi

× Kazuo Nakahigashi

en Kazuo Nakahigashi

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Masanao Shinohara

× Masanao Shinohara

en Masanao Shinohara

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Tomoaki Yamada

× Tomoaki Yamada

en Tomoaki Yamada

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Hajime Shiobara

× Hajime Shiobara

en Hajime Shiobara

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Yusuke Yamashita

× Yusuke Yamashita

en Yusuke Yamashita

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Kimihiro Mochizuki

× Kimihiro Mochizuki

en Kimihiro Mochizuki

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Kenji Uehira

× Kenji Uehira

en Kenji Uehira

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抄録
内容記述タイプ Other
内容記述 <title>Abstract</title>The evolution history of the Sea of Japan back-arc basin remains under debate, involving the opening of sub-basins such as the Japan and Yamato Basins. Detailed knowledge of the lithospheric structure will provide the key to understanding tectonic history. This study identifies the lithosphere–asthenosphere boundary (LAB) beneath the Sea of Japan back-arc basin using S-receiver functions (S-RFs). The study area, including the Japan and Yamato Basins, has been instrumented with broadband ocean-bottom seismometers (OBSs). S-RFs from these OBSs show negative Sp phases preceding the direct S arrivals, suggesting the LAB. The S-RFs also show abnormally reduced amplitudes. For further qualitative interpretation of these findings, we conduct transdimensional Bayesian inversion for S-wave velocity models. This less-subjective Bayesian approach clarifies that the low-velocity seafloor sediments and damped deconvolution contribute to the amplitude reduction, illuminating the necessity of such considerations for similar receiver function works. Inverted velocity structures show a sharp velocity decrease at the mantle depths, which we consider the LAB. The obtained LAB depths vary among sites: ~ 45 km beneath the Japan and Yamato Basins and ~ 70 km beneath the Yamato Rise, a bathymetric high between the two basins. The thick lithosphere beneath the Yamato Rise most likely reflects its continental origin. However, the thickness is still thin compared to that of eastern Asia, suggesting lithosphere extension by rifting. Notably, the Japan and Yamato Basins show a comparable lithospheric thickness, although the crustal thickness beneath the Yamato Basin is known to be anomalously thick. This consistency in the lithospheric thickness implies that both basins undergo similar back-arc opening processes.
言語 en
書誌情報 en : Earth, Planets and Space

巻 73, 号 1
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 1880-5981
DOI
関連識別子 10.1186/s40623-021-01501-5
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