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Akita-Komagatake

Stratovulcano · Japan · 1637 m

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. · Foto: Photo by Ichio Moriya (Kanazawa University). · Wikimedia Commons
Tipo
Stratovulcano
Paese
Japan
Regione
Northwestern Pacific Volcanic Regions / Northeast Japan Volcanic Arc
Altitudine
1637 m
Coordinate
39.761, 140.799
Ultima eruzione
1971
Contesto tettonico
Subduction zone / Continental crust (> 25 km)
Forma vulcanica
Composite
Roccia principale
Basalt / Picro-Basalt
Sintesi geologica

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.

Sintesi da Wikipedia

Riassunto in inglese

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.

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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
8800 BCE~8441 BCE · 1 eruzioni · VEI max. 38441 BCE~8082 BCE · 1 eruzioni · VEI max. 48082 BCE~7723 BCE · 1 eruzioni · VEI max. 47364 BCE~7005 BCE · 1 eruzioni · VEI max. ?6646 BCE~6287 BCE · 1 eruzioni · VEI max. 36287 BCE~5928 BCE · 2 eruzioni · VEI max. 31620 BCE~1261 BCE · 1 eruzioni · VEI max. ?543 BCE~184 BCE · 2 eruzioni · VEI max. 3184 BCE~175 · 1 eruzioni · VEI max. 2175~534 · 1 eruzioni · VEI max. ?534~893 · 1 eruzioni · VEI max. 3893~1252 · 1 eruzioni · VEI max. 21611~1970 · 4 eruzioni · VEI max. 28800 BCE6287 BCE3415 BCE902 BCE1611

Cronologia dettagliata

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

Link esterni

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