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  1. 防災科研関係論文

Moho depth variation beneath southwestern Japan revealed from the velocity structure based on receiver function inversion

https://nied-repo.bosai.go.jp/records/2682
https://nied-repo.bosai.go.jp/records/2682
4b9d5a11-44b0-4ce7-8553-db55b5a1b128
Item type researchmap(1)
公開日 2023-04-27
タイトル
言語 en
タイトル Moho depth variation beneath southwestern Japan revealed from the velocity structure based on receiver function inversion
言語
言語 eng
著者 Katsuhiko Shiomi

× Katsuhiko Shiomi

en Katsuhiko Shiomi

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Kazushige Obara

× Kazushige Obara

en Kazushige Obara

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Haruo Sato

× Haruo Sato

en Haruo Sato

Search repository
抄録
内容記述タイプ Other
内容記述 The Philippine Sea plate is subducting under the Eurasian plate beneath the Chugoku-Shikoku region, southwestern Japan. We have constructed depth contours for the continental and oceanic Mohos derived from the velocity structure based on receiver function inversion. Receiver functions were calculated using teleseismic waveforms recorded by the high-density seismograph network in southwestern Japan. In order to determine crustal velocity structure, we first improved the linearized time-domain receiver function inversion method. The continental Moho is relatively shallow (similar to 30km) at the coastline of the Sea of Japan and at the Seto Inland Sea, and becomes deeper-greater than 40km-around 35 degrees N and 133.8 degrees E. Near the Seto Inland Sea, a low-velocity layer of thickness 10km lies under the continental Moho. This low-velocity layer corresponds to the subducting oceanic crust of the Philippine Sea plate. The oceanic Moho continues to descend from south to northwest and exhibits complicated ridge and valley features. The oceanic Moho runs around 25 km beneath the Pacific coast and 45 kin beneath the Seto Inland Sea, and it extends to at least to 34.5 degrees N. The depth variation of the Moho discontinuities is in good qualitative agreement with the concept of isostasy. From the configurations of both the continental and oceanic Mohos, we demonstrate that the continental lower crust and the subducting oceanic crust overlap beneath the southern and central part of Shikoku and that a mantle wedge may exist beneath the western and eastern part of Shikoku. The southern edge of the overlapping region coincides with the downdip limit of the slip area of a megathrust earthquake. (c) 2006 Elsevier B.V. All rights reserved.
言語 en
書誌情報 en : TECTONOPHYSICS

巻 420, 号 1-2, p. 205-221, 発行日 2006-06
出版者
言語 en
出版者 ELSEVIER SCIENCE BV
ISSN
収録物識別子タイプ ISSN
収録物識別子 0040-1951
DOI
関連識別子 10.1016/j.tecto.2006.01.017
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