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Mount Yōtei

Yoteizan

Stratovolcano · Japan · 1898m

Yoteizan volcano, seen here from the NW, has deep radial valleys and a large crater at the summit with several smaller craters along the NW rim.
Yoteizan volcano, seen here from the NW, has deep radial valleys and a large crater at the summit with several smaller craters along the NW rim. · Photo: Photo by Ichiyo Moriya (Kanazawa University). · Wikimedia Commons
Type
Stratovolcano
Country
Japan
Region
Northwestern Pacific / Northeast Japan Volcanic Arc
Elevation
1898m
Coordinates
42.827, 140.811
Last eruption
-1050
Tectonic setting
Subduction zone / Continental crust (> 25 km)
Landform
Composite
Major rock type
Andesite / Basaltic Andesite
Geological summary

Yoteizan is a symmetrical andesitic-to-dacitic stratovolcano NW of Toya caldera. Its summit is truncated by a 700-m-wide crater that is cut on its NW rim by overlapping smaller craters. Deep radial gullies cut the flanks. The latest eruption from the main edifice took place about 5,000-6,000 years ago. Hangetsu-ko (Half Moon Lake), a tuff cone on the lower NW flank, was estimated from stratigraphic evidence to have erupted about 3,000 years ago.

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
3550 BCE~3358 BCE · 1 eruptions · max VEI ?1242 BCE~1050 BCE · 1 eruptions · max VEI ?3550 BCE2973 BCE2396 BCE1819 BCE1242 BCE

Detailed timeline

  1. 1050 BCEVEI ?Geological estimate
    BCE 1050 – Ongoing
    NW flank (Hangetsu-ko)
  2. 3550 BCEVEI ?Geological estimate
    BCE 3550 – Ongoing

External links

⚠ For reference only. Not for emergency response.