Minami-Hiyoshi Seamount

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″N 141°56′06″E[1]
Country	Japan
Geology
Type	Stratovolcanoes
Last eruption	1975

The Minami-Hiyoshi Seamount is an active seamount in the Bonin Islands of Japan.

Geography

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]

Composition

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]

Recent activity

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]

Gallery

• 
  Activity at Minami-Hiyoshi in 10 January 1977
• 
  Rafts of volcanic rocks rising to the surface above the Minami-Hiyoshi volcano in 12 January 1977

See also

• Kaitoku Seamount
• List of volcanoes in Japan

References

1. "Minami-Hiyoshi Seamount". Global Volcanism Program. Smithsonian Institution. Retrieved 1 January 2023.
2. "Minamihiyoshi Seamount" (in Japanese). Japan Coast Guard Hyrdographic and Oceanographic Department. Retrieved January 6, 2023.
3. Petrova, V. V.; Rashidov, V. A. (2019). "Composition and Origin of Lavas from the Minami-Hiyoshi Submarine Volcano (Mariana Arc)". Doklady Earth Sciences. 485 (1): 238–241. Bibcode:2019DokES.485..238P. doi:10.1134/S1028334X19030140. S2CID 189995687. Retrieved 7 January 2023.
4. Nishizawa, A.; Ono, T.; Sasahara, N.; Hashiguchi, H.; Otani, Y. (2003). Ocean Bottom Seismographic Observation at Minami-Hiyoshi Seamount at the Northern End of the Mariana Arc (Report) (in Japanese). Japan Coast Guard Hydrographic and Oceanographic Department. pp. 3–20. Retrieved January 7, 2023.