Tectonic movement in the northern part of the Nisi-Sitito Ridge.
There are many small scale ridges known to be running from NE to SW or from ENE to WSW in echelon arrangement in the Izu-Ogasawara Ridge. Based on data obtained by the survey of the basic map of the continental shelf made during 1974 to 1978, displacement of small scale ridges changing direction from NE-SW to ENE-WSW near the Zenisu Bank was found. Following tectonic movements were inferred in the Northern part of Nisi-sitito Ridge; The Zenisu Ridge has moved along left lateral fault parallel to axis of the Nisi-sitito Ridge, and has turned clockwise about 10° near the Zenisu Bank. These were caused by a spreading of the area between the Nisi-sitito and Sitito Ridge. The age of this activity was considered as being after the deposition of the Yugasima Group correlatives in the Miocene Epoch.
| Main Authors: | , |
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| Format: | Journal Contribution biblioteca |
| Language: | Japanese |
| Published: |
1982
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| Online Access: | http://hdl.handle.net/1834/16226 |
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