| Minami-Hiyoshi Seamount | |
|---|---|
 Bathymetry map of Minami-Hiyoshi | |
 | |
| Summit depth | −107 m (−351 ft) [1] |
| Height | ~1,300 m (4,265 ft) |
| Location | |
| Range | Izu-Ogasawara Ridge |
| Coordinates | 23°30′00″N141°56′06″E / 23.50000°N 141.93500°E [1] |
| Country | Japan |
| Geology | |
| Type | Stratovolcanoes |
| Last eruption | 1975 |
The Minami-Hiyoshi Seamount is an active seamount in the Bonin Islands of Japan.
Located 1,350 km (839 mi) south of Tokyo and 155 km (96 mi) south of Iwo Jima, The main cone of the Hiyoshi complex, the Minami-Hiyoshi is a stratovolcano with a base diameter of 19 km (12 mi) with a height above the seabed around 1,300 m (4,265 ft). [2] The submarine volcano complex involves four submarine volcanic peaks; Kita-Hiyoshi, Naka-Hiyoshi, Minami-Hiyoshi and the Ko-Hiyoshi submarine volcanoes. This complex is geologically connected to the Izu-Mariana arc. [3]
Unlike volcanoes of the south and central parts of the Mariana volcanic arc, which usually are made of low-alkali and mid-alkali tholeeite basalt, the Hiyoshi complex includes more alkaline lava with more K, Ba and Sr. [3]
In a report about the seismic activity of the volcano compiled in 2003, the active cone, Minami-Hiyoshi was reported to have "low activity" over the period of a month in 2001. [4] Other than that, Minami-Hiyoshi has had many periods of activity including 1975, 1976, 1977, 1978, 1992 and 1996. [1]
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