Tarumai volcano is a small stratovolcano constructed on the SE rim of the 13 x 15 km Shikotsu caldera. The summit of Tarumai contains a small 1.5-km-wide caldera that was formed during two of Hokkaido's largest historical eruptions, in 1667 and 1739. It is capped by a flat-topped summit lava dome that grew in 1909. Tarumai has been Hokkaido's most active volcano in historical time. Two other Holocene post-caldera volcanoes occur at Shikotsu, Fuppushi (adjacent to Tarumai) and Eniwa, on the opposite side of the caldera. Photo by Ichio Moriya (Kanazawa University).
KVERT reported that during 23-24 December gas-and-steam plumes from Koryaksky containing a small amount of ash were detected on satellite images. On 24 December observers from the Nalychevo valley reported that a dark plume rose 200-300 m from a fumarolic vent on the NW flank and a boom was heard later that night.
AVO reported that on 24 December the Volcano Alert Level for Cleveland was raised to Advisory due to a persistent thermal anomaly near the summit visible on satellite imagery acquired the day before.
The Smithsonian's Global Volcanism Program seeks better understanding of all volcanoes through documenting their eruptions — small as well as large — during the past 10,000 years.
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