文章基本信息

标题：Seismic structure of the northern end of the Ryukyu Trench subduction zone, southeast of Kyushu, Japan
其他标题：Seismic structure of the northern end of the Ryukyu Trench subduction zone, southeast of Kyushu, Japan
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作者：Azusa Nishizawa ; Kentaro Kaneda ; Mitsuhiro Oikawa 等
期刊名称：Earth, Planets and Space
电子版ISSN：1880-5981
出版年度：2009
卷号：61
期号：8
页码：e37-e40
DOI：10.1186/BF03352942
出版社：Springer Verlag
摘要：P -wave velocity models related to the Philippine Sea plate subduction have been obtained from seismic explorations at the northern end of the Nansei-Shoto (Ryukyu) Trench. Both multi-channel seismic reflection and ocean bottom seismographic records provide clear images of the rough seafloor topography and irregular P -wave velocity structure of the northwestern extension of the Kyushu-Palau Ridge and Amami Plateau below the landward trench slope. Low velocity ( V p ≤ 4–5 km/s) and thick (>7 km) materials above the plate boundary characterize the landward trench slope structure. An exception to this is found where the subducting plate contacts higher velocity ( V p > 5 km/s) materials of the landward plate at the estimated position of the seismic asperity of 1968 Hyuganada earthquake ( M w 7.5).
关键词：Marine seismics ;Ryukyu (Nansei Shoto) Trench ;Kyushu-Palau Ridge ;Philippine Sea plate subduction