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Earthquakes near Tarumai in 2013
Friday, Sep 20, 2013
The latest report of the Japan Meteorological Agency indicates some unrest at the caldera. Seismic activity accompanied by inflation were recorded under the western flank of Tarumai stratovolcano (the most active vent of the system, located on the SW rim of the Shikotsu caldera) between late June and early July this year. ... [more]
 

Shikotsu volcano

caldera 1320 m / 4,331 ft
Hokkaido, Japan, 42.69°N / 141.38°E
Current status: dormant (1 out of 5)
Shikotsu volcano books
Last update: 20 Sep 2013 (seismic unrest)
Typical eruption style: explosive
Shikotsu volcano eruptions: 1981, 1978-79, 1978, 1954-55, 1954, 1953, 1951, 1951, 1944, 1936, 1936, 1933, 1931, 1928-29, 1928, 1926, 1923, 1921, 1920, 1919, 1918, 1917, 1909, 1894, 1894, 1887, 1886, 1885, 1883, 1874, 1871(?), 1867, 1804-17, 1739, 1667
TimeMag. / DepthDistanceLocation
Fri, 7 Jul
Fri, 7 Jul 03:47 UTCM 2.7 / 130.8 km12 kmS OFF TOMAKOMAI
Mon, 3 Jul
Mon, 3 Jul 07:14 UTCM 2.6 / 129.5 km7 kmIBURI REGION
Sat, 1 Jul
Sat, 1 Jul 14:45 UTCM 5.3 / 30.4 km41 kmISHIKARI DEPRESSION
Sun, 25 Jun
Sun, 25 Jun 01:57 UTCM 3.1 / 120.4 km16 kmS OFF TOMAKOMAI
Wed, 7 Jun
Wed, 7 Jun 14:29 UTCM 2.6 / 125.8 km16 kmS OFF TOMAKOMAI
View all recent quakes
Shikotsu volcano is the large 15 x 13 km diameter caldera containing 360 m deep Lake Shikotsu (支笏湖 Shikotsu-ko), Japan's second largest crater lake and the northernmost lake which doesn't feeeze over in winter.
The small andesitic Tarumai (Tarumae, 樽前山 Tarumae-zan) stratovolcano sits on the SE rim of Shikotsu caldera and has been Hokkaido's most active volcano in historical time.
In the winter the Chitose-Shikotsuko-Hyobaku-Matsuri Festival (Ice Fall Festival) features sculptured made out of ice from lake water.

Background:

The Shikotsu caldera was formed during one of Hokkaido's largest Quaternary eruptions about 31-34,000 years ago.
Pyroclastic-flow deposits from Tarumai extend almost to the Pacific coast. 2 other Holocene post-caldera volcanoes, Fuppushi (adjacent to Tarumai) and Eniwa (on the opposite side of the caldera), occur on a line trending NW from Tarumai, and were constructed just inside the caldera rim.
Minor eruptions took place from the summit of Eniwa volcano as late as the 17th century. The summit of Tarumai contains a small 1.5-km-wide caldera formed during 2 of Hokkaido's largest historical eruptions, in 1667 and 1739. Tarumai is now capped by a flat-topped summit lava dome that formed in 1909.
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