Mount Iō (硫黄山, Iō-zan) also Mount Iwo is an active andesitic stratovolcano on the Shiretoko Peninsula of Hokkaidō, Japan. It sits within the borders of the town of Shari. Mount Iō is known for erupting liquid sulphur in the eruptions of 1889 and 1936.[3] Mount Iō literally means, sulphur mountain. There are two explosion craters and a lava dome at the summit of the volcano.[4] A different volcano with a similar name, in SW Japan erupted in April 2018.

Mount Iō
硫黄山
Mount Iō and Kamuiwakka Falls (August 2014)
Highest point
Elevation	1,562.0 m (5,124.7 ft)[1]
Prominence	243 m (797 ft)[1]
Parent peak	Mount Sashirui
Listing	List of mountains in Japan List of volcanoes in Japan
Coordinates	44°8′0″N 145°9′40″E[1]
Naming
English translation	Sulphur Mountain
Language of name	Japanese
Geography
Mount Iō Location of Mount Iō in Japan.
Location	Hokkaidō, Japan
Parent range	Shiretoko Peninsula
Topo map	Geospatial Information Authority, 25000:1 硫黄山 50000:1 羅臼
Geology
Mountain type	Stratovolcano
Volcanic arc/belt	Kuril arc[2]
Last eruption	1936

History of eruptions

Volcanic activity started at least 240,000 years ago.[4] Mount Iō has erupted at the following times:[5]

1. 850 AD ± 500 years
2. 1857–1858
3. 23–26 September 1876
4. 24–26 November 1880
5. 9–26 August 1889
6. 15 June 1890–unknown
7. December 1935–October 1936

This is not the volcano that erupted in April 2018, which is in the Miyazaki Prefecture in SW Japan.[6]

See also

• Shiretoko National Park
• List of mountains in Japan
• List of volcanoes in Japan

References

External links

• Media related to Mount Iō (Shiretoko) at Wikimedia Commons
• Shiretoko-Iozan - Japan Meteorological Agency (in Japanese)
• "Shiretoko-Iozan: National catalogue of the active volcanoes in Japan" (PDF). - Japan Meteorological Agency

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[fr] Mont Iō (Shiretoko)

[ru] Иодзан