Kusatsu-Shirane volcano is a complex of overlapping cones and 3 lake-filled craters (Karagama, Yugama, Mizugama) at the summit. It is located 150 km NW of Tokyo.
All historical eruptions have consisted of phreatic explosions from the acidic crater lakes or their margins. There are fumaroles and hot springs around the flanks of the volcano, and many rivers draining from the volcano are acid. Similar to Ijen volcano, the crater was the site of active sulfur mining for many years during the 19th and 20th centuries.
JMA reported that during 8-15 August volcanic earthquakes continued at Kusatsu-Shiranesan’s crater, although they had decreased from early August and tremor was absent. The Alert Level remains at 2 (on a scale of 1-5). ...more
JMA reported that deformation of Kusatsu-Shiranesan’s crater and the elevated temperatures which began earlier in March, continued during 25-30 June. ...more
This activity has been focused in the area immediately of N of Mizugama crater. Some seismicity was also reported, although tremor was absent. The Alert Level remains at 2 (on a scale of 1-5). (Smithsonian / USGS Weekly Volcanic Activity Report, 25 June-1 July 2014) [less]
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