HR: 1340h
AN: T43A-1366    [Abstracts]
TI: Seismic Imaging of the Subduction Zones Beneath Kyushu, Japan by Receiver Function Analysis
AU: * Murakoshi, T
EM: murakosi@nda.ac.jp
AF: Department of Earth and Ocean Sciences, School of Applied Sciences, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, 239-8686 Japan
AU: Takenaka, H
EM: takenaka@geo.kyushu-u.ac.jp
AF: Department of Earth and Planetary Sciences, Faculty of Sciences, Kyushu University, Hakozaki 6-10-1, Fukuoka, 812-8581 Japan
AU: Shimizu, H
EM: shimizu@sevo.kyushu-u.ac.jp
AF: Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University, 2-5643-29 Shin'yama, Shimabara, 855-0843 Japan
AU: Uehira, K
EM: uehira@sevo.kyushu-u.ac.jp
AF: Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University, 2-5643-29 Shin'yama, Shimabara, 855-0843 Japan
AB: For understanding the tectonic features of typical active subduction zones, we studied seismic structure of the crust and uppermost mantle beneath Kyushu, Japan by use of receiver function analysis. Murakoshi et al.(2003) applied the receiver function inversion using genetic algorithm to estimate the detailed velocity structures beneath the stations and showed that a low velocity layer is visible in the uppermost mantle beneath Fukuejima island in the western Kyushu, Japan by using the 17 broadband seismic stations in Kyushyu, Japan. And Murakoshi et al.(2004) estimated the three-dimensional velocity structures beneath Kyushu, Japan by using a migration technique. The low velocity layer is visible in the uppermost mantle in the western Kyushu may show the partially melting by the mantle upwelling in the backarc of Kyushu, Japan. But there are a few numbers of the broadband seismic stations in the western Kyusyu. So we installed new broadband seismic stations at Hirado, Sumoto and Take in the western Kyusyu, Japan to study this structure in detail. We applied these new data for the receiver function analysis and the migration imaging.
DE: 7200 SEISMOLOGY
DE: 7218 Lithosphere (1236)
DE: 7240 Subduction zones (1207, 1219, 1240)
DE: 7280 Volcano seismology (8419)
SC: Tectonophysics [T]
MN: Fall Meeting 2005