According to experts' data, ejections are accompanied by long-duration surface earthquakes measuring about two points on the Richter scale.
Video surveillance of the volcano is difficult because Shiveluch is remote and the weather conditions are bad, but for seismic events of such a force, avalanches are natural.
After a long period of inactivity, the northernmost active volcano (its height is 3,283 meters above the sea level) woke up in January 2004.
The volcano poses no danger for the peninsula's populated localities now. Shiveluch activity jeopardizes transportation routes by mud streams from the slope of the volcano. The Klyuchi-Ust-Kamchatsk highway was repeatedly washed away.
Ash ejections and trails are dangerous for aircraft: if volcanic ash particles get into aircraft turbines, some mechanisms may fail; besides, sudden ejections make navigation more complicated.
