Multi-channel seismic reflection survey in the Sagami Trough.
In 1984 and 1985, a multi-channel seismic reflection survey on the six survey lines were carried out by the Survey Vessel Takuyo of the Hydrographic Department of Japan in the Sagami Trough bordering the northeastern margin of the Philippine Sea plate. The survey has revealed some characteristics of the geological structure in the Sagami Trough. Acoustic basement reflector of the southern trough slope is traced beneath the Awa Canyon and bottom of the trough near the Boso Canyon. The basement is inclined northeastward, so the Philippine Sea plate is overlain by the Eurasia plate. Well-deformed layer and inclosed meardering canyon in the central part of the Sagami Trough presents a contrast to the other convergence boundary of plates. These indicate the change of tectonics after sedimentation of the layer and support the change of the direction of the plate motion. There is a large possibility that a zone of the Boso Canyon is a former accretionary prism, when the Philippine Sea plate moved to north and subducted beneath the northern slope
| Main Authors: | , , |
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| Format: | Journal Contribution biblioteca |
| Language: | Japanese |
| Published: |
1987
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| Online Access: | http://hdl.handle.net/1834/16152 |
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| Summary: | In 1984 and 1985, a multi-channel seismic reflection survey on the six survey lines were carried out by the Survey Vessel Takuyo of the Hydrographic Department of Japan in the Sagami Trough bordering the northeastern margin of the Philippine Sea plate. The survey has revealed some characteristics of the geological structure in the Sagami Trough.
Acoustic basement reflector of the southern trough slope is traced beneath the Awa Canyon and bottom of the trough near the Boso Canyon. The basement is inclined northeastward, so the
Philippine Sea plate is overlain by the Eurasia plate. Well-deformed layer and inclosed meardering canyon in the central part of the Sagami Trough presents a contrast to the other convergence boundary of plates. These indicate the change of tectonics after sedimentation of the layer and support the change of the direction of the plate motion. There is a large possibility that a zone of the Boso Canyon is a former accretionary prism, when the Philippine Sea plate moved to north and
subducted beneath the northern slope |
|---|