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Three-dimensional shear wave structure beneath the Philippine Sea from land and ocean bottom broadband seismograms
| 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 | | tomography | | ocean bottom seisometer |
| Issue Date: | 2006 |
| Journal Title: | Journal of Geophysical Research |
| Volume: | 111 |
| Issue: | B6 |
| Start Page: | B06310 |
| 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. |
| Relation: | http://www.agu.org/pubs/authors/pdf/copyright.pdf |
| Type: | article |
| URI: | http://hdl.handle.net/2115/52169 |
| 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)
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Submitter: 吉澤 和範
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