Seismic structure of the northern end of the Ryukyu Trench subduction zone, southeast of Kyushu, Japan

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 topogra...

Full description

Saved in:
Bibliographic Details
Published in:Earth, planets, and space planets, and space, 2009-01, Vol.61 (8), p.e37-e40
Main Authors: Nishizawa, Azusa, Kaneda, Kentaro, Oikawa, Mitsuhiro
Format: Article
Language:English
Subjects:
E-Letter
Earth and Environmental Science
Earth Sciences
Geology
Geophysics/Geodesy
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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).
ISSN:1343-8832
1880-5981
DOI:10.1186/BF03352942