Report on Sinarka (Russia) — 3 December-9 December 2014
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 3 December-9 December 2014
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2014. Report on Sinarka (Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 3 December-9 December 2014. Smithsonian Institution and US Geological Survey.
48.873°N, 154.182°E; summit elev. 911 m
All times are local (unless otherwise noted)
SVERT reported that on 3 December satellite images of Sinarka showed steam-and-gas emissions with small amounts of ash drifting 40 km NE. Diffuse steam-and-gas emissions were observed on 6 December. Cloud cover obscured views on the other days during 1-8 December. The Aviation Color Code was raised to Yellow.
Geologic Background. Sinarka volcano, occupying the northern end of Shiashkotan Island in the central Kuriles, has a complex structure. A small, 2-km-wide depression open to the NW has been largely filled and overtopped by an andesitic postglacial central cone that itself contains a lava dome that forms the high point of the island. Another lava dome, Zheltokamennaya Mountain, lies 1.5 km to the SW along the buried SW rim of the caldera, and a smaller dome lies along the northern caldera rim. Historical eruptions have occurred during the 17th and 18th centuries. The last and largest of these, during 1872-78, was once thought to originate from Kuntomintar volcano at the southern end of the island, but is now attributed to Sinarka (Gorshkov, 1970).