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Shear wave speed structure beneath the South Pacific superswell using broadband data from ocean floor and islands

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Title: Shear wave speed structure beneath the South Pacific superswell using broadband data from ocean floor and islands
Authors: Isse, Takehi Browse this author
Suetsugu, Daisuke Browse this author
Shiobara, Hajime Browse this author
Sugioka, Hiroko Browse this author
Yoshizawa, Kazunori Browse this author →KAKEN DB
Kanazawa, Toshihiko Browse this author
Fukao, Yoshio Browse this author
Issue Date: Aug-2006
Journal Title: Geophysical Research Letters
Volume: 33
Issue: 16
Publisher DOI: 10.1029/2006GL026872
Abstract: [1] We determined three-dimensional shear wave speed structure beneath the South Pacific superswell down to a depth of 200 km by analyzing Rayleigh wave records from broadband ocean bottom seismograph stations and island stations in the Pacific Ocean. The ocean bottom stations were deployed from 2003 to 2005 on the seafloor in the French Polynesian region, which enabled us to study the upper mantle structure beneath the Superswell with unprecedentedly high resolution. We measured the dispersions of fundamental mode Rayleigh waves at periods between 40 and 140 seconds by the two-station method. We found pronounced slow anomalies near the hot spots and in the Lau Basin. The slow anomalies beneath the hot spots have deeper-rooted than those associated with the Lau basin. The slow anomalies near the Society, Macdonald, Marquesas, and Pitcairn hot spots continue down to at least 200 km depth.
Rights: Copyright 2006 American Geophysical Union.
Relation: http://www.agu.org/pubs/authors/pdf/copyright.pdf
Type: article
URI: http://hdl.handle.net/2115/52170
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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