Seismic activity of the volcano increased. An explosive eruption with ash plumes
up to 5 km (or 16,400 ft.) ASL is possible.
Seismicity of the volcano increased on December 22 and remains slightly
above background levels from ~00:00 UTC December 23 till present.
There is one seismic station at the area of Mutnovsky and Gorely volcanoes
but a spectral analysis of seismic signal point to Gorely volcano.
According to visual data, first after a long time a strong fumarolic
activity of Gorely volcano was observed on November 28. A height of gas-
steam plume was about 400 m above volcanic crater.
Last strong explosive eruption of the volcano occurred in 1986. Ash
plumes rose up to ~ 5.0 km (16,400 ft) ASL. Gorely volcano is located
about 75 km to the south-west from Petropavlovsk-Kamchatsky: http://www.kscnet.ru/ivs/kvert/volcanoes/Gorely/index_eng.html . Phreatic
and phreato-magmatic eruptions are typical for the volcano.