Usu (Hokkaido Prefecture, Japan)

Mt. Usu, Japan

Volcano: Usu (see Usu at the Smithsonian Institution website in a new tab)
Type: Soil Diffuse Emission
Description: Mt Usu volcano is Hokkaido is one of Japan's most well-known volcanoes. The summit of Usu consists of several lava domes that formed in historic time. The 2000 eruption of Usu volcano was the first in 22 years and followed several days of increased seismicity and ground deformation. A first new vent opened in the West-Nishiyama area on 31 March 2000, followed by activity in the Kompira area on 1 April. Eruptive activity lasted for more than a year and gradually declined until September 2001. The eruptions were phreatic and phreato-magmatic, and caused small pyroclastic flows.

Point of contact for this site:
Hiroshi Shinohara, (Geological Survey of Japan, AIST)

Number of measurements: 3
Measurement date (d/m/y) Added by Added on
Usu_0919981/9/1998 Emanuela Bagnato Oct. 5, 2014
Usu_0919991/9/1999 Emanuela Bagnato Oct. 5, 2014
Usu_0620001/6/2000 Emanuela Bagnato Oct. 5, 2014

Bibliographic references for this site

Hernández P.A. , K. Notsu, J.M. Salazar, T. Mori, G. Natale, H. Okada, G. Virgili, Y. Shimoike, M. Sato,N.M. Pérez, 2001,Carbon dioxide degassing by advective flow from Usu volcano, Japan, Science, vol.292, pp. 83-86

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