Japan · Caldera
Ata Caldera
Ata
- Type
- Caldera
- Elevation
- 924m
- Last eruption
- 885
- Type
- Caldera
- Country
- Japan
- Region
- Western Pacific / Ryukyu Volcanic Arc
- Elevation
- 924m
- Coordinates
- 31.180, 130.528
- 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 volcanic field as part of the Ata post-caldera system. That area consists of numerous central cones and maars, the 4-km-diamter lake-filled 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 along with 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. JMA (2013) listed as distinct volcanoes both Kaimondake and the combination of Ikeda and Yamagawa, while also including them all as features of the Ata Caldera, as in this catalog.
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.
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Eruption history
27 recordedGlossaryDetailed timeline
- 1615VEI ?Method not stated1615-08-07 – end unknownKaimon
- 885VEI 4Observed885-08-29 – 885-09-28Kaimon
- 882VEI 2Method not stated882-11 – end unknownKaimon
- 874VEI 4Observed874-03-29 – 874-07Kaimon
- 866VEI 2Method not stated866-05 – end unknownKaimon
- 860VEI 2Method not stated860-04 – end unknownKaimon
- 770VEI 4Geological estimate770 – end unknownKaimon
- 720VEI 4Geological estimate720 – end unknownKaimon
- 660VEI 4Geological estimate660 – end unknownKaimon
- 600VEI 4Geological estimate600 – end unknownKaimon
- 550VEI 2Geological estimate550 – end unknownKaimon
- 270VEI 3Geological estimate270 – end unknownKaimon
- 150VEI 4Geological estimate150 – end unknownKaimon
- 130VEI 4Geological estimate130 – end unknownKaimon
- 30VEI 3Geological estimate30 – end unknownKaimon
- 80 BCEVEI 4Geological estimate80 BCE – end unknownKaimon
- 270 BCEVEI 4Geological estimate270 BCE – end unknownKaimon
- 650 BCEVEI 4Geological estimate650 BCE – end unknownKaimon
- 700 BCEVEI 2Geological estimate700 BCE – end unknownKaimon
- 1450 BCEVEI ?Geological estimate1450 BCE – end unknownMizunashi, Kagami, Ikezoko maars
- 1500 BCEVEI 4Geological estimate1500 BCE – end unknownKaimon
- 1550 BCEVEI ?Geological estimate1550 BCE – end unknownNabeshima-dake
- 1610 BCEVEI 3Geological estimate1610 BCE – end unknownKaimon
- 1780 BCEVEI 4Geological estimate1780 BCE – end unknownKaimon
- 2010 BCEVEI 4Geological estimate2010 BCE – end unknownKaimon
- 2690 BCE (±75 yrs)VEI 5Geological estimate2690 BCE – end unknownIkeda-ko caldera
- 5050 BCEVEI ?Geological estimate5050 BCE – end unknownUnagi, Narikawa and Yamakawa maars
Nearby volcanoes
External links
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