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Kuju Mountains

Kujusan

Stratovolcano · Japan · 1791m

The Kuju volcano group in northern Kyushu consists of more than ten cones and lava domes NE of Aso caldera. This view from the E shows Mimatayama (right) and Nakadake (left) lava domes, which formed about 10,000-12,000 years ago. Gas-and-steam plumes rising from fumaroles are seen here in 1994 on the flank of Hosshozan (center), the site of small phreatic explosions in November 1995. Many hot springs and hydrothermal fields are located at the Kuju complex.
The Kuju volcano group in northern Kyushu consists of more than ten cones and lava domes NE of Aso caldera. This view from the E shows Mimatayama (right) and Nakadake (left) lava domes, which formed about 10,000-12,000 years ago. Gas-and-steam plumes rising from fumaroles are seen here in 1994 on the flank of Hosshozan (center), the site of small phreatic explosions in November 1995. Many hot springs and hydrothermal fields are located at the Kuju complex. · Photo: Photo by Yasuo Miyabuchi, 1994 (Forestry and Forest Products Research Institute, Kyushu). · Wikimedia Commons
Type
Stratovolcano
Country
Japan
Region
Western Pacific Volcanic Regions / Nankai Volcanic Arc
Elevation
1791m
Coordinates
33.086, 131.249
Last eruption
1996
Tectonic setting
Subduction zone / Continental crust (> 25 km)
Landform
Composite
Major rock type
Andesite / Basaltic Andesite
Geological summary

Kujusan is a complex of stratovolcanoes and lava domes lying NE of Aso caldera in north-central Kyushu. The group consists of 16 andesitic lava domes, five andesitic stratovolcanoes, and one basaltic cone. Activity dates back about 150,000 years. Six major andesitic-to-dacitic tephra deposits, many associated with the growth of lava domes, have been recorded during the Holocene. Eruptive activity has migrated systematically eastward during the past 5000 years. The latest magmatic activity occurred about 1600 years ago, when Kurodake lava dome at the E end of the complex was formed. The first reports of historical eruptions were in the 17th and 18th centuries, when phreatic or hydrothermal activity occurred. There are also many hot springs and hydrothermal fields. A fumarole on Hosho lava dome was the site of a sulfur mine for at least 500 years. Two geothermal power plants are in operation at Kuju.

From Wikipedia

Mount Kujū , located on the border of Kokonoe and Taketa in Ōita Prefecture, Japan, is a stratovolcano in Kyushu Island, Japan, with a summit elevation of 1,791 metres (5,876 ft). It is one of the 100 Famous Japanese Mountains. It is part of the Aso-Kujū National Park.

Wikipedia · CC BY-SA · Read full article →

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
9160 BCE~8788 BCE · 1 eruptions · max VEI 47301 BCE~6929 BCE · 1 eruptions · max VEI ?4698 BCE~4326 BCE · 1 eruptions · max VEI ?3954 BCE~3582 BCE · 1 eruptions · max VEI 43211 BCE~2839 BCE · 1 eruptions · max VEI ?2467 BCE~2095 BCE · 1 eruptions · max VEI 41723 BCE~1351 BCE · 1 eruptions · max VEI ?1351 BCE~980 BCE · 1 eruptions · max VEI 4236 BCE~136 · 1 eruptions · max VEI 4136~508 · 1 eruptions · max VEI 31623~1995 · 4 eruptions · max VEI 29160 BCE6557 BCE3582 BCE980 BCE1623

Detailed timeline

  1. 1995VEI 1Observed
    1995-10-11 – 1996-03-24
    Hosho lava dome (east flank)
  2. 1738VEI 2Geological estimate
    1738-08-13 – Ongoing
  3. 1675VEI 2Observed
    1675-06 – Ongoing
  4. 1662VEI 2Observed
    1662-01-26 – Ongoing
  5. 370 (±40 yrs)VEI 3Geological estimate
    370 – Ongoing
    Kuro-dake
  6. 100 BCE (±300 yrs)VEI 4Geological estimate
    BCE 100 – Ongoing
    Komekubo crater
  7. 990 BCE (±940 yrs)VEI 4Geological estimate
    BCE 990 – Ongoing
    Komekubo crater
  8. 1720 BCE (±300 yrs)VEI ?Geological estimate
    BCE 1720 – Ongoing
    Taisen-Minami
  9. 2440 BCE (±300 yrs)VEI 4Geological estimate
    BCE 2440 – Ongoing
    Danbaru
  10. 3110 BCE (±500 yrs)VEI ?Geological estimate
    BCE 3110 – Ongoing
    Iwaigo-dake, Ogigahana, Hizengajo
  11. 3780 BCE (±500 yrs)VEI 4Geological estimate
    BCE 3780 – Ongoing
    Taisen-Hokubu lava dome
  12. 4490 BCE (±500 yrs)VEI ?Geological estimate
    BCE 4490 – Ongoing
    Tachi-san, Gakurokuji
  13. 7180 BCE (±2640 yrs)VEI ?Geological estimate
    BCE 7180 – Ongoing
    Sensui-zan
  14. 9160 BCE (±1190 yrs)VEI 4Geological estimate
    BCE 9160 – Ongoing

External links

⚠ For reference only. Not for emergency response.