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Mount Iwate

Iwatesan

Gunung api kompleks · 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
Tipe
Gunung api kompleks
Negara
Japan
Wilayah
Pasifik Barat Laut / Northeast Japan Volcanic Arc
Ketinggian
2038 m
Koordinat
39.853, 141.001
Letusan terakhir
1919
Kondisi tektonik
Subduction zone / Continental crust (> 25 km)
Bentuk lahan
Composite
Batuan utama
Basalt / Picro-Basalt
Ringkasan geologi

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.

Riwayat letusan

Ringkasan (VEI dari waktu ke waktu)
Klik pada bar untuk melihat letusan individu
6450 BCE~6171 BCE · 2 letusan · VEI maks. ?5891 BCE~5612 BCE · 1 letusan · VEI maks. ?5053 BCE~4773 BCE · 2 letusan · VEI maks. ?4494 BCE~4214 BCE · 2 letusan · VEI maks. 03935 BCE~3655 BCE · 1 letusan · VEI maks. ?3376 BCE~3096 BCE · 1 letusan · VEI maks. 03096 BCE~2817 BCE · 2 letusan · VEI maks. ?2817 BCE~2537 BCE · 1 letusan · VEI maks. ?2258 BCE~1979 BCE · 2 letusan · VEI maks. ?1699 BCE~1420 BCE · 2 letusan · VEI maks. ?1420 BCE~1140 BCE · 2 letusan · VEI maks. 3581 BCE~302 BCE · 2 letusan · VEI maks. ?22 BCE~257 · 1 letusan · VEI maks. ?1096~1375 · 1 letusan · VEI maks. 31375~1655 · 1 letusan · VEI maks. ?1655~1934 · 6 letusan · VEI maks. 36450 BCE4494 BCE2258 BCE302 BCE1655

Garis waktu rinci

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

Tautan eksternal

⚠ Untuk referensi saja. Bukan untuk tanggap darurat.