The Topography and the Geological Structure of the Accretionary Prism in the northern part of Nansei-syoto Trench Topography and the Geological Structure of the Accretionary Prism
Hydrographic Department of Japan (JHD) has been conducting geological and geophysical surveys by S/V TAKUYO under the Continental Shelf Surveys Project since 1983 in the southern waters of Japan. The surveyed area has covered the Ryukyu Arc and the northern part of the Philippine Sea Basin. JHD obtained SeaBeam swath bathymetric data, single channel and multi-channel seismic reflection profiles in the northern part of the Nansei-Syoto Trench west of the Amami Plateau from 1987 to 1988. The northern part of the Nansei-Syoto Trench is characterized by deformed landward slope because of shallow subducted ridges, the Kyusyu-Palau Ridge and the Amami Plateau. Small accretionary prism form a ship-shaped belt about 30km wide and 110km long in slope foot of the segment from the Tokara Channel to N30°. Detail study of geomophology of the accretionary prism and landward trench slope shows the following conclusions : (1) The accretionary prism is composed of fine sediments derived from uplifted zone around Kikai island. (2) The accretionary prism has high poor fluid pressure ratio as near toe of the Barbados accretionay prism.
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| Format: | Journal Contribution biblioteca |
| Language: | Japanese |
| Published: |
1996
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| Online Access: | http://hdl.handle.net/1834/15774 |
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