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Three-dimensional shear wave structure beneath the Philippine Sea from land and ocean bottom broadband seismograms

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Title: Three-dimensional shear wave structure beneath the Philippine Sea from land and ocean bottom broadband seismograms
Authors: Isse, Takehi Browse this author
Yoshizawa, Kazunori Browse this author →KAKEN DB
Shiobara, Hajime Browse this author
Shinohara, Masanao Browse this author
Nakahigashi, Kazuo Browse this author
Mochizuki, Kimihiro Browse this author
Sugioka, Hiroko Browse this author
Suetsugu, Daisuke Browse this author
Oki, Satoko Browse this author
Kanazawa, Toshihiko Browse this author
Suyehiro, Kiyoshi Browse this author
Fukao, Yoshio Browse this author
Keywords: surface wave
ocean bottom seisometer
Issue Date: 2006
Journal Title: Journal of Geophysical Research
Volume: 111
Issue: B6
Publisher DOI: 10.1029/2005JB003750
Abstract: [1] We obtained three-dimensional (3-D) shear wave speed structure beneath the Philippine Sea and the surrounding region from seismograms recorded by land-based and long-term broadband ocean bottom seismographic stations. The ocean bottom data gave us a better station coverage to obtain a higher spatial resolution (about 300–400 km) in the Philippine Sea than in previous studies. We employed a new technique of surface wave tomography, in which multimode phase speeds are measured and inverted for a 3-D shear wave speed structure by incorporating the effects of finite frequency and ray bending. There is a sharp speed contrast along the Izu-Bonin-Mariana trench, across which the Philippine Sea side has a significantly slower upper mantle than the Pacific Ocean side. In the upper 120 km, the shear wave speed structure is well correlated with the age of the provinces. At depths greater than 160 km, the pattern is dominated by fast anomalies of the subducted slabs of the Pacific plate and two slow anomalies to the south of the Daito ridge and in the southernmost part of the Philippine Sea.
Rights: Copyright 2006 American Geophysical Union.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 吉澤 和範

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