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Akita-Komagatake

Stratovolcano · Japan · 1637m

Onamedake cone and the Amidaike pond are located at the NE end of the summit crater complex of Akita-Komagatake. This cone forms the highest point of the volcano and has produced lava flows to the N and E. This photo is taken from the NE rim of a 1.5 x 3 km caldera partially filled by basaltic cones.
Onamedake cone and the Amidaike pond are located at the NE end of the summit crater complex of Akita-Komagatake. This cone forms the highest point of the volcano and has produced lava flows to the N and E. This photo is taken from the NE rim of a 1.5 x 3 km caldera partially filled by basaltic cones. · Photo: Photo by Ichio Moriya (Kanazawa University). · Wikimedia Commons
Type
Stratovolcano
Country
Japan
Region
Northwestern Pacific Volcanic Regions / Northeast Japan Volcanic Arc
Elevation
1637m
Coordinates
39.761, 140.799
Last eruption
1971
Tectonic setting
Subduction zone / Continental crust (> 25 km)
Landform
Composite
Major rock type
Basalt / Picro-Basalt
Geological summary

Two calderas partially filled by basaltic cones cut the summit of Akita-Komagatake volcano. The larger southern caldera is 1.5 x 3 km wide and has a shallow sloping floor that is drained through a narrow gap cutting the SW caldera rim. On its northern side is a smaller more circular 1.2-km-wide caldera whose rim is breached widely to the NE. The two calderas were formed following explosive eruptions at the end of the Pleistocene, between about 13,500 and 11,600 years ago. Two cones, Medake and Kodake, occupy the NE corner of the southern caldera, whose long axis trends NE-SW. The Onamedake cone within the northern caldera has produced lava flows to the north and east; it has a 100-m-wide summit crater. Small-scale historical eruptions have occurred from cones and fissure vents inside the southern caldera. The temperatures of geothermal areas increased beginning in 2005, and some fumarolic plumes were observed in 2011-12.

From Wikipedia

Akita-Komagatake is an active stratovolcano located 10 km east of Tazawa Lake, near the border between Akita and Iwate prefectures on Honshu Island. The volcano last erupted from 18 September 1970 to 25 January 1971. It is the highest mountain in Akita Prefecture and the second highest in Towada-Hachimantai National Park.

Wikipedia · CC BY-SA · Read full article →

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
8800 BCE~8441 BCE · 1 eruptions · max VEI 38441 BCE~8082 BCE · 1 eruptions · max VEI 48082 BCE~7723 BCE · 1 eruptions · max VEI 47364 BCE~7005 BCE · 1 eruptions · max VEI ?6646 BCE~6287 BCE · 1 eruptions · max VEI 36287 BCE~5928 BCE · 2 eruptions · max VEI 31620 BCE~1261 BCE · 1 eruptions · max VEI ?543 BCE~184 BCE · 2 eruptions · max VEI 3184 BCE~175 · 1 eruptions · max VEI 2175~534 · 1 eruptions · max VEI ?534~893 · 1 eruptions · max VEI 3893~1252 · 1 eruptions · max VEI 21611~1970 · 4 eruptions · max VEI 28800 BCE6287 BCE3415 BCE902 BCE1611

Detailed timeline

  1. 1970VEI 2Observed
    1970-09-18 – 1971-01-26
    Me-dake
  2. 1932VEI 2Observed
    1932-07-21 – 1932-07-24
    Ishibora (south flank of Me-dake)
  3. 1902VEI 1Observed
    1902 – Ongoing
    Yoko-dake
  4. 1890VEI 2Observed
    1890-12 – 1891-01
  5. 1100VEI 2Geological estimate
    1100 – Ongoing
  6. 807VEI 3Observed
    807 – Ongoing
  7. 400 (±500 yrs)VEI ?Geological estimate
    400 – Ongoing
    Me-dake
  8. 50 BCE (±200 yrs)VEI 2Geological estimate
    BCE 50 – Ongoing
  9. 200 BCE (±200 yrs)VEI ?Geological estimate
    BCE 200 – Ongoing
    Minami-dake, Ko-dake
  10. 350 BCE (±200 yrs)VEI 3Geological estimate
    BCE 350 – Ongoing
  11. 1450 BCE (±50 yrs)VEI ?Geological estimate
    BCE 1450 – Ongoing
  12. 5950 BCE (±200 yrs)VEI 3Geological estimate
    BCE 5950 – Ongoing
  13. 6150 BCE (±300 yrs)VEI ?Geological estimate
    BCE 6150 – Ongoing
  14. 6350 BCE (±200 yrs)VEI 3Geological estimate
    BCE 6350 – Ongoing
  15. 7100 BCE (±900 yrs)VEI ?Geological estimate
    BCE 7100 – Ongoing
  16. 7850 BCE (±200 yrs)VEI 4Geological estimate
    BCE 7850 – Ongoing
  17. 8300 BCE (±300 yrs)VEI 4Geological estimate
    BCE 8300 – Ongoing
  18. 8800 BCE (±300 yrs)VEI 3Geological estimate
    BCE 8800 – Ongoing

External links

⚠ For reference only. Not for emergency response.