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Minami-Hiyoshi Seamount

Minami-Hiyoshi

Stratovolcano · Japan · 107m (submarine)

Minami-Hiyoshi (center) is seen in this Japan Coast Guard bathymetric image with N to the right. Periodic water discoloration and water-spouting have been reported over this submarine volcano since 1975 along with audible detonations and an explosion. Minami-Hiyoshi lies near the SE end of a coalescing chain of seamounts. Naka-Hiyoshi (upper right) lies to the NW and Ko-Hiyoshi seamount (left) to the SSE.
Minami-Hiyoshi (center) is seen in this Japan Coast Guard bathymetric image with N to the right. Periodic water discoloration and water-spouting have been reported over this submarine volcano since 1975 along with audible detonations and an explosion. Minami-Hiyoshi lies near the SE end of a coalescing chain of seamounts. Naka-Hiyoshi (upper right) lies to the NW and Ko-Hiyoshi seamount (left) to the SSE. · Photo: Image courtesy of HOD Japan Coast Guard (http://www1.kaiho.mlit.go.jp/jhd-E). · Wikimedia Commons
Type
Stratovolcano
Country
Japan
Region
Northwestern Pacific Volcanic Regions / Mariana Volcanic Arc
Elevation
107m (submarine)
Coordinates
23.500, 141.935
Last eruption
1975
Tectonic setting
Subduction zone / Crustal thickness unknown
Landform
Composite
Major rock type
Trachyandesite / Basaltic Trachyandesite
Geological summary

Periodic water discoloration and water-spouting have been reported over the Minami-Hiyoshi submarine volcano since 1975, when detonation sounds and an explosion were also reported. It lies near the SE end of a coalescing chain of youthful seamounts, and is the only vent with recorded activity. The reported depth of the summit of the trachyandesitic volcano has varied between 274 and 30 m. The morphologically youthful seamounts Kita-Hiyoshi and Naka-Hiyoshi lie to the NW, and Ko-Hiyoshi to the SE.

From Wikipedia

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

Wikipedia · CC BY-SA · Read full article →

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
1975~1977 · 3 eruptions · max VEI 01977~1979 · 1 eruptions · max VEI 01992~1994 · 1 eruptions · max VEI 01994~1996 · 1 eruptions · max VEI 019751979198619901994

Detailed timeline

  1. 1996VEI 0Geological estimate
    1996-01-11 – 1996-01-12
  2. 1992VEI 0Geological estimate
    1992-02-12 – 1992-03-04
  3. 1978VEI 0Geological estimate
    1978-01-26 – 1978-03-24
  4. 1976VEI 0Geological estimate
    1976-02-16 – Ongoing
  5. 1976VEI 0Geological estimate
    1976-12-20 – 1977-03-28
    Hiyoshi-Okinoba (also 23.48 N 141.67 E)
  6. 1975VEI 0Observed
    1975-08-25 – Ongoing
    23.50 N 141.92 E

External links

⚠ For reference only. Not for emergency response.