福徳岡ノ場 (1986) の火山活動について
1986 年 25 巻 4 号 p. 12-18
詳細
1986 年 25 巻 4 号 p. 12-18
The Izu-Ogasawara Ridge is an island arc along the Izu-Ogasawara Trench where the Pacific Plate subducts 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.
Recently, violent submarine volcanic eruption occurred at 24°17.0' N, 141°29.1' E, about 5km north-northeast of the Minami-Io Sima.
This area has been called the Hukutoku-Oka-no-Ba, which has records of constructing volcanic island two times.
New volcanic island at the Hukutoku-Oka-no-Ba was born in 1986 Jan.20, then vanished in Mar.26. The retrogression and the thermal distribution of this new volcanic island are discussed below.
