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Hakkōda Mountains

Hakkodasan

Stratovolcano · Japan · 1585m

Hakkoda consists of a group of 14 cones and lava domes south of Mutsu Bay at the northern end of Honshu. The NE rim of an 8-km-wide Pleistocene caldera forms an arcuate ridge across the caldera floor to the NE of the Hakkoda group volcanoes, which bury the SE caldera wall. This view looks from the W towards the northern Akakuradake, Idodake, and Hakkodasan volcanoes seen from left to right.
Hakkoda consists of a group of 14 cones and lava domes south of Mutsu Bay at the northern end of Honshu. The NE rim of an 8-km-wide Pleistocene caldera forms an arcuate ridge across the caldera floor to the NE of the Hakkoda group volcanoes, which bury the SE caldera wall. This view looks from the W towards the northern Akakuradake, Idodake, and Hakkodasan volcanoes seen from left to right. · Photo: Photo by Takashi Kudo, 1996 (Hokkaido University). · Wikimedia Commons
Type
Stratovolcano
Country
Japan
Region
Northwestern Pacific Volcanic Regions / Northeast Japan Volcanic Arc
Elevation
1585m
Coordinates
40.659, 140.877
Last eruption
1550
Tectonic setting
Subduction zone / Continental crust (> 25 km)
Landform
Composite
Major rock type
Andesite / Basaltic Andesite
Geological summary

The basaltic-to-rhyolitic Hakkodasan volcano includes at least 17 stratovolcanoes and lava domes south of Mutsu Bay at the northern end of Honshu. The NE rim of an 8-km-wide Pleistocene caldera forms an arcuate ridge across a flat caldera-floor moat NE of the Hakkoda group volcanoes, which bury the SE caldera wall. A northern group of volcanoes, constructed within the caldera, appears to be younger than the southern group. Hakkoda-Odake, Ido-dake, and Tsurugi-dake have well-preserved craters. Akakuradake has a 1-km-wide explosion crater breached to the north. No historical eruptions are known, although an active solfatara occurs at Idodake, and hot springs are found at several locations within the caldera. Three minor phreatic eruptions were documented from Jigokunuma on the SW flank of Odake volcano from the 13th-17th centuries. Three soldiers on a training mission in July 1997 were killed by inhalation of volcanic gas.

From Wikipedia

The Hakkōda Mountains are an active volcanic complex in south-central Aomori Prefecture, Japan, in Towada-Hachimantai National Park. Often called Mount Hakkōda or simply Hakkōda (八甲田), the mountains are collectively listed as one of the 100 Famous Japanese Mountains. Its highest peak, Mount Ōdake, lies 21.3 kilometers (13.2 mi) southeast of central Aomori and 28 kilometers (17 mi) west of central Towada and has an elevation of 1,585 meters (5,200 ft). The Hakkōda Mountains are a part of the Ōu Mountains which make up part of the Northeastern Japan Arc, a segment of the Pacific Ring of Fire. The volcanic complex consists of fourteen stratovolcanoes and lava domes arranged into two volcanic groups. The Northern Hakkōda Volcanic Group emerges from the rim of an 8-kilometer-wide (5.0 mi) caldera that dates back to the Pleistocene. The Southern Hakkōda Volcanic Group predates the caldera.

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Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
2850 BCE~2650 BCE · 1 eruptions · max VEI 22250 BCE~2050 BCE · 1 eruptions · max VEI 31250 BCE~1050 BCE · 1 eruptions · max VEI 150 BCE~150 · 1 eruptions · max VEI 1350~550 · 1 eruptions · max VEI 11150~1350 · 1 eruptions · max VEI 11350~1550 · 1 eruptions · max VEI 12850 BCE1850 BCE650 BCE3501350

Detailed timeline

  1. 1550 (±100 yrs)VEI 1Geological estimate
    1550 – Ongoing
    SW flank of O-dake (Jigoku-numa)
  2. 1340 (±75 yrs)VEI 1Geological estimate
    1340 – Ongoing
    SW flank of O-dake (Jigoku-numa)
  3. 450VEI 1Geological estimate
    450 – Ongoing
    O-dake
  4. 50 BCEVEI 1Geological estimate
    BCE 50 – Ongoing
    O-dake
  5. 1150 BCEVEI 1Geological estimate
    BCE 1150 – Ongoing
    O-dake
  6. 2250 BCEVEI 3Geological estimate
    BCE 2250 – Ongoing
    O-dake
  7. 2850 BCEVEI 2Geological estimate
    BCE 2850 – Ongoing
    O-dake

External links

⚠ For reference only. Not for emergency response.