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Photo of this volcano
  • Japan
  • Stratovolcano
  • 1050 BCE
  • Country
  • Primary Volcano Type
  • Last Known Eruption
  • 42.827°N
  • 140.812°E

  • 1888 m
    6194 ft

  • 285032
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports for Yoteizan.

The Global Volcanism Program has no Weekly Reports available for Yoteizan.

The Global Volcanism Program has no Bulletin Reports available for Yoteizan.

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.

Eruptive History

There is data available for 2 confirmed Holocene eruptive periods.

1050 BCE (?) Confirmed Eruption  

Episode 1 | Eruption Episode NW flank (Hangetsu-ko)
1050 BCE (?) - Unknown Evidence from Correlation: Tephrochronology

List of 2 Events for Episode 1 at NW flank (Hangetsu-ko)

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion
   - - - -    - - - - Ash

3550 BCE (?) Confirmed Eruption  

Episode 1 | Eruption Episode
3550 BCE (?) - Unknown Evidence from Correlation: Tephrochronology

List of 1 Events for Episode 1

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion Uncertain
Deformation History

There is no Deformation History data available for Yoteizan.

Emission History

There is no Emissions History data available for Yoteizan.

Photo Gallery

Several generations of craters can be seen at the summit of Yotei volcano in SW Hokkaido, Japan. The principal crater of the symmetrical Yotei stratovolcano, seen here from the south, is 700 m wide. The NW rim of the crater was later modified by eruptions that produced the two overlapping smaller craters at the upper left. No historical eruptions are known from Yotei volcano.

Copyrighted photo by Katia and Maurice Krafft, 1981.
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 by Ichiyo Moriya (Kanazawa University).
Yotei volcano is seen here to the NW above Lake Toya, which fills the 10-km-wide Toya caldera. The caldera formed during a major eruption about 110,000 years ago. A series of lava domes in the center of the lake form Nakanojima island, whose flank is in the right foreground. The photo was taken from the lower flank of Usu volcano, which formed on the southern rim of Toya caldera.

Photo by Norm Banks, 1981 (U.S. Geological Survey).
Shikotsu caldera, seen from the SE with Yoteizan volcano on the horizon, is a 13 x 15 km caldera filled by Lake Shikotsu. Following formation of the caldera more than 30,000 years ago, three small cones were constructed along a NW-trend across the caldera. Snow-capped Tarumai (left center) formed near the SE rim of the caldera, along with Fuppushi to its right. A third volcano, Eniwa, was constructed on the NW caldera rim at the far side of the lake.

Photo by Ichio Moriya (Kanazawa University).
Yoteizan volcano is seen here from the W. The deep radial gullies on the flanks are less pronounced on this side.

Photo by Shin'ichiro Gomi, 1997 (Hokkaido University).
The Fukidashi lava flow from Yoteizan in SW Hokkaido descended to the NE foot of the volcano. Vertical cooling joints can be seen to the left in this view near the terminus of the flow. Note the person behind the tree at the lower-center for scale.

Photo by Shin'ichiro Gomi, 1997 (Hokkaido University).
Yoteizan has a 700-800 m wide summit crater and smaller adjoining craters along its NW rim, shown in the center of this September 2019 Planet Labs satellite image monthly mosaic (N is at the top). Erosion has formed radial gullies down the flanks and the roughly 500-m-wide Hangetsu-ko crater is on the NW flank.

Satellite image courtesy of Planet Labs Inc., 2019 (https://www.planet.com/).
GVP Map Holdings

The maps shown below have been scanned from the GVP map archives and include the volcano on this page. Clicking on the small images will load the full 300 dpi map. Very small-scale maps (such as world maps) are not included. The maps database originated over 30 years ago, but was only recently updated and connected to our main database. We welcome users to tell us if they see incorrect information or other problems with the maps; please use the Contact GVP link at the bottom of the page to send us email.

Smithsonian Sample Collections Database

There are no samples for Yoteizan in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.

External Sites