The submarine topography off the eastern Izu Peninsula and sub-bottom structure around Teisi knoll.
Three months after the submarine eruption of Teisi Knoll on July 13 1989, survey vessel surveyed the southwestern part of Sagami Bay by her narrow multi-beam echo sounder (Hydrochart II) and sparker (for seismic reflection) in detail. From April 27 to May 1 1990, dredge hauls were recovered from the top parts of the Higasi-Izu-Oki Submarine Volcanoes by her. Most of the dredged rock samples are fresh. The NW-SE linear arrangements of these volcanoes are clearly identified by the detailed submarine topographic map. The direction of these arrangements agrees with that of the lateral faults that should occur as a result of the subduction of the Philippine Sea Plate. For several ten thousand years, producing these faults with the subduction of the plate, the submarine eruptions have occurred over and over along their cracks. The last event of those is the submarine eruption of Teisi Knoll.
| Main Authors: | , , , |
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| Format: | Journal Contribution biblioteca |
| Language: | Japanese |
| Published: |
1991
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| Online Access: | http://hdl.handle.net/1834/16066 |
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