Submarine volcanic activity at the Kaitoku Seamount in 1984.
The Izu-Ogasawara Ridge is an island arc along the Izu-Ogasawara Trench where the Pacific Plate sudbucts beneath the Philippine Sea Plate. Many active volcanic islands and submarine volcanoes exist in a line on the Izu-Ogasawara Ridge, and form a typical volcanic front. New volcanoes have been discovered on the front caused by volcanic activities at points where volcanic activity has never been reported. Recently, submarine eruption occurred at 26° 07. 3’N, 141° 06.l’E, 80 km north of the Kita-Io Sima. As this area is a good fishing ground, many fishing boats of Japan work there. A fishing boat named Kaitoku-Maru (85 tons) discovered the shoal at 26°08.8’N, 141°06.6’E in April 1927, and at 26°03.l’N, 140°56.0’E in June, 1927. Two shoals have been called the Higasi-Kaitoku-Ba and Nisi-Kai toku-Ba, respectiveIy. This area has no reliable report regarding eruption, except one time at 26°00’N, 140°46’E in 1543. Consequently, the Nisi-Kaitoku-Ba is supposed to be a submarine volcano. Accordingly, the eruption at the Higasi-Kaitoku-Ba is the first confirmation of submarine volcanic activity at this location. Submarine topographic data for this area is very little; however, it is supposed that one seamount has two summits(east and west). Therefore, the Maritime Safety Agency gave the name Kaitoku Seamount. The progress of the eruption at the Kaitoku Seamount,the survey around the Kaitoku Seamount, the thermal distribution of discolored water, and the chemical composition of rocks and discolored water from the Kaitoku Seamount are discussed below.
| Main Authors: | , , , , , , |
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| Format: | Journal Contribution biblioteca |
| Language: | Japanese |
| Published: |
1985
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| Online Access: | http://hdl.handle.net/1834/16209 |
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