Geomagnetic anomalies at sea around South-West Japan.
Magnetic total intensity data collected around South-West Japan obtained through "The Basic Map of the Sea” project of the Japanese Hydrographic Department are compiled. Results were compared with the topographic and geological features of the sea floor and adjacent land area. The smooth magnetic pattern with two weak magnetic positive zones along the deep sea terrace and the outer edge of the continental slope are characteristic between Nankai Trough and South-Western Japan. The Eastern China Sea and the Japan Sea area around S-W Japan show complicated magnetic patterns accompanied by NE-SW or NNE-SSW trending islet-seamount chains or uplifted zones of the basement rocks. The geological structure on land of Kyusyu and these magnetic features of the Eastern China Sea suggest that the opening or spreading of the marginal sea resulted from the intrusion of andesitic and other igneous rocks along fault zones caused by crustal movements of the trench. key words: Solid earth geomagnetism, Island arc.
| Main Authors: | , , |
|---|---|
| Format: | Journal Contribution biblioteca |
| Language: | Japanese |
| Published: |
1980
|
| Online Access: | http://hdl.handle.net/1834/16232 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|