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Ata Caldera

Ata

Caldera · Japan · 924m

Kaimon volcano is the youngest and most prominent feature of the Ibusuki volcanic field at the southern tip of Kyushu, seen here from the N. It was constructed during the last 4,000 years and has been the source of historical eruptions in the volcanic field. The Ibusuki field is located W of the Pleistocene Ata caldera and contains numerous small cones, maars, and the 4.5-km-wide Ikedoko caldera.
Kaimon volcano is the youngest and most prominent feature of the Ibusuki volcanic field at the southern tip of Kyushu, seen here from the N. It was constructed during the last 4,000 years and has been the source of historical eruptions in the volcanic field. The Ibusuki field is located W of the Pleistocene Ata caldera and contains numerous small cones, maars, and the 4.5-km-wide Ikedoko caldera. · Photo: Photo by Lee Siebert, 1988 (Smithsonian Institution). · Wikimedia Commons
Type
Caldera
Country
Japan
Region
Western Pacific Volcanic Regions / Ryukyu Volcanic Arc
Elevation
924m
Coordinates
31.220, 130.570
Last eruption
885
Tectonic setting
Subduction zone / Continental crust (> 25 km)
Landform
Caldera
Major rock type
Andesite / Basaltic Andesite
Geological summary

The submerged 15 x 25 km Ata caldera under Kagoshima Bay is one of several large calderas in southern Kyushu and the source of major pyroclastic flows associated with its formation more than 40,000 years ago. The National Catalogue of the Active Volcanoes of Japan (JMA, 2013) included features of the Ibusuki field as part of the Ata post-caldera system. That area consists of numerous central cones and maars, the 4.5-km-wide Ikeda caldera, and Kaimondake stratovolcano. The symmetrical andesitic Kaimondake is the most prominent feature, and is capped by a lava dome. Ibusuki has been very active during the Holocene, forming the Ikeda caldera about 4,600 years ago, numerous maars and lava domes. Kaimondake formed during the last 4,000 years, from which all eruptive activity has occurred after about 2,650 years ago. Its last eruption took place in the 9th century. While listed as features of the Ata caldera, JMA (2013) simultaneously listed Kaimondake and the combination of Ikeda and Yamagawa as distinct volcanoes.

From Wikipedia

Ata Caldera , containing the Ata North Caldera, and the Ata South Caldera, which in turn contains Mount Kaimon and Ikeda Caldera amongst other volcanoes, is a massive, ill defined, mostly submerged volcanic caldera structure associated with the southern portions of Kagoshima Bay.

Wikipedia · CC BY-SA · Read full article →

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
5050 BCE~4828 BCE · 1 eruptions · max VEI ?2828 BCE~2606 BCE · 1 eruptions · max VEI 52162 BCE~1940 BCE · 1 eruptions · max VEI 41940 BCE~1717 BCE · 1 eruptions · max VEI 41717 BCE~1495 BCE · 3 eruptions · max VEI 41495 BCE~1273 BCE · 1 eruptions · max VEI ?829 BCE~607 BCE · 2 eruptions · max VEI 4384 BCE~162 BCE · 1 eruptions · max VEI 4162 BCE~60 · 2 eruptions · max VEI 460~282 · 3 eruptions · max VEI 4504~726 · 4 eruptions · max VEI 4726~949 · 6 eruptions · max VEI 41393~1615 · 1 eruptions · max VEI ?5050 BCE3495 BCE1717 BCE162 BCE1393

Detailed timeline

  1. 1615VEI ?Geological estimate
    1615-08-07 – Ongoing
    Kaimon
  2. 885VEI 4Observed
    885-08-29 – 885-09-28
    Kaimon
  3. 882VEI 2Geological estimate
    882-11 – Ongoing
    Kaimon
  4. 874VEI 4Observed
    874-03-29 – 874-07
    Kaimon
  5. 866VEI 2Geological estimate
    866-05 – Ongoing
    Kaimon
  6. 860VEI 2Geological estimate
    860-04 – Ongoing
    Kaimon
  7. 770VEI 4Geological estimate
    770 – Ongoing
    Kaimon
  8. 720VEI 4Geological estimate
    720 – Ongoing
    Kaimon
  9. 660VEI 4Geological estimate
    660 – Ongoing
    Kaimon
  10. 600VEI 4Geological estimate
    600 – Ongoing
    Kaimon
  11. 550VEI 2Geological estimate
    550 – Ongoing
    Kaimon
  12. 270VEI 3Geological estimate
    270 – Ongoing
    Kaimon
  13. 150VEI 4Geological estimate
    150 – Ongoing
    Kaimon
  14. 130VEI 4Geological estimate
    130 – Ongoing
    Kaimon
  15. 30VEI 3Geological estimate
    30 – Ongoing
    Kaimon
  16. 80 BCEVEI 4Geological estimate
    BCE 80 – Ongoing
    Kaimon
  17. 270 BCEVEI 4Geological estimate
    BCE 270 – Ongoing
    Kaimon
  18. 650 BCEVEI 4Geological estimate
    BCE 650 – Ongoing
    Kaimon
  19. 700 BCEVEI 2Geological estimate
    BCE 700 – Ongoing
    Kaimon
  20. 1450 BCEVEI ?Geological estimate
    BCE 1450 – Ongoing
    Mizunashi, Kagami, Ikezoko maars
  21. 1500 BCEVEI 4Geological estimate
    BCE 1500 – Ongoing
    Kaimon
  22. 1550 BCEVEI ?Geological estimate
    BCE 1550 – Ongoing
    Nabeshima-dake
  23. 1610 BCEVEI 3Geological estimate
    BCE 1610 – Ongoing
    Kaimon
  24. 1780 BCEVEI 4Geological estimate
    BCE 1780 – Ongoing
    Kaimon
  25. 2010 BCEVEI 4Geological estimate
    BCE 2010 – Ongoing
    Kaimon
  26. 2690 BCE (±75 yrs)VEI 5Geological estimate
    BCE 2690 – Ongoing
    Ikeda-ko caldera
  27. 5050 BCEVEI ?Geological estimate
    BCE 5050 – Ongoing
    Unagi, Narikawa and Yamakawa maars

External links

⚠ For reference only. Not for emergency response.