Minami-Hiyoshi Seamount
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). 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.
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.
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. Other than that, Minami-Hiyoshi has had many periods of activity including 1975, 1976, 1977, 1978, 1992 and 1996.
Gallery
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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
References
- ^ "Minami-Hiyoshi Seamount". Global Volcanism Program. Smithsonian Institution. Retrieved 1 January 2023.
- ^ "Minamihiyoshi Seamount" (in Japanese). Japan Coast Guard Hyrdographic and Oceanographic Department. Retrieved January 6, 2023.
- ^ 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.
- ^ 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.