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Hachimantai

Stratovolcano · Japan · 1613m

A series of craters, some filled by lakes, dot the undulating summit plateau of Hachimantai. The volcano produced vents during the Pleistocene, and lava flows from the center of the complex. Circular craters are located near Komonomore and Mokkodake in the center of the plateau.
A series of craters, some filled by lakes, dot the undulating summit plateau of Hachimantai. The volcano produced vents during the Pleistocene, and lava flows from the center of the complex. Circular craters are located near Komonomore and Mokkodake in the center of the plateau. · Photo: Photo by Ichio Moriya (Kanazawa University). · Wikimedia Commons
Type
Stratovolcano
Country
Japan
Region
Northwestern Pacific / Northeast Japan Volcanic Arc
Elevation
1613m
Coordinates
39.958, 140.854
Last eruption
-5350
Tectonic setting
Subduction zone / Continental crust (> 25 km)
Landform
Composite
Major rock type
Andesite / Basaltic Andesite
Geological summary

Hachimantai was constructed from widely scattered vents during the Pleistocene and is capped with andesitic lavas from vents in the center of the complex. The summit forms an undulating plateau surrounded by steep slopes. Circular craters are located near Komonomore and Mokkodake in the center of the plateau. The craters are youthful looking, but have not been dated. Hayakawa (1996, pers. comm.) considered Hachimantai to be of possible Holocene age. No historical eruptions have been recorded, but active solfataras are found on the western and southern flanks.

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
7900 BCE~7704 BCE · 1 eruptions · max VEI ?5546 BCE~5350 BCE · 1 eruptions · max VEI ?7900 BCE7312 BCE6723 BCE6135 BCE5546 BCE

Detailed timeline

  1. 5350 BCEVEI ?Geological estimate
    BCE 5350 – Ongoing
  2. 7900 BCE (±150 yrs)VEI ?Geological estimate
    BCE 7900 – Ongoing

External links

⚠ For reference only. Not for emergency response.