Minami-Hiyoshi Seamount Explained

Minami-Hiyoshi Seamount
Depth:	-1070NaN0^[1]
Height:	~13000NaN0
Coordinates:	23.5°N 141.935°W
Last Eruption:	1975

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

Geography

Located 13500NaN0 south of Tokyo and 1550NaN0 south of Iwo Jima, The main cone of the Hiyoshi complex, the Minami-Hiyoshi is a stratovolcano with a base diameter of 190NaN0 with a height above the seabed around 13000NaN0.^[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]

See also

• Kaitoku Seamount
• List of volcanoes in Japan

Notes and References

1. 1 January 2023.
2. Web site: Minamihiyoshi Seamount . Japanese. Japan Coast Guard Hyrdographic and Oceanographic Department. 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 . 10.1134/S1028334X19030140. 2019DokES.485..238P . 189995687 . 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 . Japanese. Japan Coast Guard Hydrographic and Oceanographic Department. 39. 3–20 . January 7, 2023.