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Usu-zan, Iburi Province, Hokkaido, Japan

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Latitude & Longitude (WGS84): 42° 32' North , 140° 50' East
Latitude & Longitude (decimal): 42.53333,140.83333
GeoHash:G#: xps1uwzww
Köppen climate type:Dfb : Warm-summer humid continental climate

Fumaroles on active dangerous volcano near Tohya lake in southwestern Hokkaido. A new parasitic cone, Showa-shinzan, erupted dacite lava from the southeast flank of Usu-zan in 1944-1945, emitting very high-temperature steam (over 800 C) consisting of water vapor, hydrogen, HF, HCl and boric acid. Fumarole gases here have the highest concentration of tin vapour (7 ppm) of any volcano (Giggenbach & Matsuo, 1991).

Mineral List

Mineral list contains entries from the region specified including sub-localities

25 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

Quaternary - Neogene
0 - 23.03 Ma

ID: 3189986
Cenozoic volcanic rocks

Age: Cenozoic (0 - 23.03 Ma)

Lithology: Felsic volcanic rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

Localities in this Region
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This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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Katsui, Y., Oba, Y., Onuma, K., Suzuki, T., Kondo, Y., Watanabe, T., Niida, K., Uda, T., Hagiwara, S., Nagao, T., Nishikawa, J., Yamamoto, M., Ykeda, Y., Katagawa, H., Tsuchiya, N., Shirahase, M., Nemoto, S., Yokoyama, S., Soya, T., Fujita, T., Inaba, K., Koide, K. (1978a) Preliminary report of the ruption of the Usu volcano. Journal of the Facultyof Science, Hokkaido University, series IV: 18(3): 385-408.
Niida, K., Katsui, Y., Suzuki, T., Kondo, Y. (1980) The 1977-1978 erption of Usu volcano. Journal of the Faculty of Science, Hokkaido University: 19(3): 357-394.
Matsuo, S., Ossaka, J., Hirabayashi, J., Ozawa, T., and Kimishima, K. (1982) Chemical nature of volcanic gases of Usu volcano in Japan. Bulletin Volcanology: 45(3): 261-264.
Oba, Y., Katsui, Y., Kurasawa, H., Ikeda, Y., and Uda, T. (1983) Petrology of historic rhyolite and dacite from Usu volcano, North Japan. Journal of the Faculty of Science, Hokkaido University, series IV: 20: 275-290.
Fujimaki, H. (1986) Fractional crystallization of the basaltic suite of Usu volcano, southwest Hokkaido, Japan, and its relationships with the associated felsic site. Lithos: 19: 129-140.
Bernard, A. and Symonds, R.B. (1988) The specification of trace metals in high temperature gases from Usu volcano Japan. EOS, Transactions of the American Geophysical Unon: 69: 514.
Giggenbach, W.F. and Matsuo, S. (1991) vauation of results from Second and Third IAVCEI Field Workshops on Volcanic Gases Mt Usu, Japan, and White Island, New Zealand. Applied Geochemistry: 6: 125-141.
Africano, F. and Bernard, A. (2000) Acid alteration in the fumarolic environment of Usu volcano, Hokkaido, Japan. Journal of Volcanology and Geothermal Research: 97: 475-495.

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