Report on Chirpoi (Russia) — 25 February-3 March 2015

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 25 February-3 March 2015
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2015. Report on Chirpoi (Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 25 February-3 March 2015. Smithsonian Institution and US Geological Survey.

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Chirpoi

Russia

46.532°N, 150.871°E; summit elev. 742 m

All times are local (unless otherwise noted)


SVERT reported that satellite images over Snow, a volcano of Chirpoi, showed gas-and-steam emissions on 23 February and a thermal anomaly on 23 and 25 February. Cloud cover obscured views on other days during 23 February-2 March. The Aviation Color Code remained at Yellow.

Geologic Background. Chirpoi, a small island lying between the larger islands of Simushir and Urup, contains a half dozen volcanic edifices constructed within an 8-9 km wide, partially submerged caldera. The southern rim of the caldera is exposed on nearby Brat Chirpoev Island. The symmetrical Cherny volcano, which forms the central cone of the island, erupted twice during the 18th and 19th centuries. The youngest volcano, Snow, originated between 1770 and 1810. It is composed almost entirely of lava flows, many of which have reached the sea on the southern coast. No historical eruptions are known from Brat Chirpoev, but its youthful morphology suggests recent strombolian activity.

Source: Sakhalin Volcanic Eruption Response Team (SVERT)