Tuesday, October 02, 2007
Russian volcano spews ashes
According to the Kamchatka branch of the Geophysical service of RAS, in one day over 300 local earthquakes were registered at the volcano. The most powerful of them could be accompanied by emission of ashes from the crater to the height up to 4,6km over the sea level, scientists think.
The thermal anomaly, the temperature of which was 38,6 degrees above zero on Celsius with ambient temperature minus 18 degrees, is registered on the volcano. Seismic stations register continuous spasmodic volcanic trembling.
Shiveluch is one of the most active volcanoes of Kamchatka. Its eruptions have "explosive character." The last eruption of the giant, related by scientists to the category of accidents, happened in 1964. Then the destruction of the lava dome happened and the giant threw out over 1 cubic kilometer of volcanic material.
The volcano started showing activity 20 years after those events. Emissions of ashes from its crater are registered 1-2 times a year. In April of 1993 the giant threw out a column to the height of up to 15 km. In February of 2005 a large cloud of ashes, thrown out by Shiveluch, was carried 700km away from the crater.
Processes, happening on the volcano during last decades, are similar to those, which happened from 1854 to 1964 - during the period between the most powerful eruptions, scientists think. By analogy it is possible to assume that in an interval of 100 years from last powerful explosion in the crater of the giant, a new one will happen. Specialists who watch the behavior of the giant with the height of 3 thousand 283 meters above the sea level say that "no less than ten of such explosions happened in 1,5 thousand years," - ITAR-TASS reports.