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Mount Iwate

Iwatesan

Vulcano complesso · Japan · 2038 m

Yakushidake (right) forms the summit of Iwatesan, and is a younger cone that was constructed over the eastern rim of NishiIwate caldera, the left-hand peak in this view from the SE. Eruptions have been recorded since the 17th century, mostly from the 500-m-wide summit crater and flank vents.
Yakushidake (right) forms the summit of Iwatesan, and is a younger cone that was constructed over the eastern rim of NishiIwate caldera, the left-hand peak in this view from the SE. Eruptions have been recorded since the 17th century, mostly from the 500-m-wide summit crater and flank vents. · Foto: Photo by Lee Siebert, 1977 (Smithsonian Institution). · Wikimedia Commons
Tipo
Vulcano complesso
Paese
Japan
Regione
Pacifico nord-occidentale / Northeast Japan Volcanic Arc
Altitudine
2038 m
Coordinate
39.853, 141.001
Ultima eruzione
1919
Contesto tettonico
Subduction zone / Continental crust (> 25 km)
Forma vulcanica
Composite
Roccia principale
Basalt / Picro-Basalt
Sintesi geologica

Viewed from the east, Iwatesan volcano has a symmetrical profile that invites comparison with Fuji, but on the west an older cone is visible containing an oval-shaped, 1.8 x 3 km caldera. After the growth of Nishi-Iwate volcano beginning about 700,000 years ago, activity migrated eastward to form Higashi-Iwate volcano. Iwate has collapsed seven times during the past 230,000 years, most recently between 739 and 1615 CE. The dominantly basaltic summit cone of Higashi-Iwate volcano, Yakushidake, is truncated by a 500-m-wide crater. It rises well above and buries the eastern rim of the caldera, which is breached by a narrow gorge on the NW. A central cone containing a 500-m-wide crater partially filled by a lake is located in the center of the oval-shaped caldera. A young lava flow from Yakushidake descended into the caldera, and a fresh-looking lava flow from the 1732 eruption traveled down the NE flank.

Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
6450 BCE~6171 BCE · 2 eruzioni · VEI max. ?5891 BCE~5612 BCE · 1 eruzioni · VEI max. ?5053 BCE~4773 BCE · 2 eruzioni · VEI max. ?4494 BCE~4214 BCE · 2 eruzioni · VEI max. 03935 BCE~3655 BCE · 1 eruzioni · VEI max. ?3376 BCE~3096 BCE · 1 eruzioni · VEI max. 03096 BCE~2817 BCE · 2 eruzioni · VEI max. ?2817 BCE~2537 BCE · 1 eruzioni · VEI max. ?2258 BCE~1979 BCE · 2 eruzioni · VEI max. ?1699 BCE~1420 BCE · 2 eruzioni · VEI max. ?1420 BCE~1140 BCE · 2 eruzioni · VEI max. 3581 BCE~302 BCE · 2 eruzioni · VEI max. ?22 BCE~257 · 1 eruzioni · VEI max. ?1096~1375 · 1 eruzioni · VEI max. 31375~1655 · 1 eruzioni · VEI max. ?1655~1934 · 6 eruzioni · VEI max. 36450 BCE4494 BCE2258 BCE302 BCE1655

Cronologia dettagliata

  1. 1934VEI ?Stima geologica
    1934-07-16 – 1935-07-02
  2. 1919VEI 1Osservata
    1919-07-15 – 1919-07-15
    W side of Onigajo caldera (O-jigokudani)
  3. 1732VEI 2Osservata
    1732-01-22 – 1732-10
    NE flank of Yakushi-dake
  4. 1689VEI 2Stima geologica
    1689-06-22 – In corso
  5. 1687VEI 2Stima geologica
    1687-04-14 – 1687-07
  6. 1686VEI 3Osservata
    1686-03-26 – 1686-03-27
  7. 1450 (±100 anni)VEI ?Stima geologica
    1450 – In corso
    Nishi-Iwate and Higashi-Iwate
  8. 1300 (±50 anni)VEI 3Stima geologica
    1300 – In corso
    Higashi-Iwate (Myoko-dake)
  9. 150VEI ?Stima geologica
    150 – In corso
    Higashi-Iwate
  10. 350 a.C.VEI ?Stima geologica
    BCE 350 – In corso
    Higashi-Iwate
  11. 450 a.C.VEI ?Stima geologica
    BCE 450 – In corso
    Nishi-Iwate (O-jigokudani area)
  12. 1150 a.C.VEI ?Stima geologica
    BCE 1150 – In corso
    Nishi-Iwate
  13. 1250 a.C.VEI 3Stima geologica
    BCE 1250 – In corso
    Higashi-Iwate
  14. 1500 a.C. (±300 anni)VEI ?Stima geologica
    BCE 1500 – In corso
    Higashi-Iwate
  15. 1650 a.C.VEI ?Stima geologica
    BCE 1650 – In corso
    Nishi-Iwate (O-jigokudani area)
  16. 2000 a.C.VEI ?Stima geologica
    BCE 2000 – In corso
    Nishi-yama
  17. 2050 a.C. (±200 anni)VEI ?Stima geologica
    BCE 2050 – In corso
    Higashi-Iwate
  18. 2700 a.C. (±200 anni)VEI ?Stima geologica
    BCE 2700 – In corso
    Higashi-Iwate
  19. 2950 a.C. (±50 anni)VEI ?Stima geologica
    BCE 2950 – In corso
    Nishi-Iwate
  20. 3050 a.C.VEI ?Stima geologica
    BCE 3050 – In corso
    Higashi-Iwate
  21. 3250 a.C. (±500 anni)VEI 0Stima geologica
    BCE 3250 – In corso
  22. 3750 a.C. (±100 anni)VEI ?Stima geologica
    BCE 3750 – In corso
    Higashi-Iwate
  23. 4350 a.C. (±500 anni)VEI ?Stima geologica
    BCE 4350 – In corso
    Higashi-Iwate
  24. 4450 a.C. (±500 anni)VEI 0Stima geologica
    BCE 4450 – In corso
    Higashi-Iwate
  25. 4850 a.C. (±50 anni)VEI ?Stima geologica
    BCE 4850 – In corso
    Nishi-Iwate
  26. 4900 a.C. (±100 anni)VEI ?Stima geologica
    BCE 4900 – In corso
    Higashi-Iwate
  27. 5650 a.C. (±50 anni)VEI ?Stima geologica
    BCE 5650 – In corso
    Nishi-Iwate
  28. 6300 a.C. (±100 anni)VEI ?Stima geologica
    BCE 6300 – In corso
    Nishi-Iwate
  29. 6450 a.C. (±1600 anni)VEI ?Stima geologica
    BCE 6450 – In corso

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