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    Bezymianny is an active stratovolcano in Kamchatka, Russia.

    Bezymianny is an active stratovolcano in Kamchatka, Russia. Prior to its noted 1955-56 eruption, Bezymianny volcano had been considered extinct. The modern Bezymianny volcano, much smaller in size than its massive neighbors Kamen and Kliuchevskoi, was formed about 4700 years ago over a late-Pleistocene lava-dome complex and an ancestral volcano that was built between about 11,000-7000 years ago. Three periods of intensified activity have occurred during the past 3000 years. The latest period, which was preceded by a 1000-year quiescence, began with the dramatic 1955-56 eruption. This eruption, similar to that of Mount St. Helens in 1980, produced a large horseshoe-shaped crater that was formed by collapse of the summit and an associated lateral blast. Subsequent episodic but ongoing lava-dome growth, accompanied by intermittent explosive activity and pyroclastic flows, has largely filled the 1956 crater.

    Kamchatkan stratovolcano Bezymianny had large explosive eruption on September 1, 2012. According to seismic data by KB GS RAS, explosive eruption began at 19:16 UTC. According to visual data, ash plumes rose up to 32,800 39,400 ft (10-12 km). Explosive phase of eruption continued till 19:45 UTC, and later there was a volcanic tremor was registered about 2 hours. There is no ash near Bezymianny volcano at now, but ash plumes are extending to the east-north-east of the volcano about 550-600 km of the volcano.

    By 21:32 UTC ash plumes were extending to the east-north-east of the volcano about 370 mi (600 km) of the volcano. As of September 2nd the Aviation color code is back Orange from Red and the eruption of the volcano is gradually finishing. Ash plumes are extending more 370 mi (600 km) to the east-north-east of the volcano.

    Ongoing activity could affect international and low-flying aircraft.

    Three periods of intensified activity have occurred during the past 3000 years. The latest period, which was preceded by a 1000-year quiescence, began with the dramatic 1955-56 eruption. This eruption, similar to that of Mount St. Helens in 1980, produced a large horseshoe-shaped crater that was formed by collapse of the summit and an associated lateral blast. Subsequent episodic but ongoing lava-dome growth, accompanied by intermittent explosive activity and pyroclastic flows, has largely filled the 1956 crater.


    The explosion of the volcano Nameless October 22, 1955 Photo from the archives of the Kamchatka-pilot observer A. Semenov.

    The eruption of 1955-1956. was the first in the area since 1697 and was, according to research tefrohronologicheskih, after 1000 years of peace. Before the eruption of the volcano was in the form of a cone proper height 3085 m (predominantly andesitic stratovolcano of complicated by apical side and extrusive domes). Eruption began on October 22, 1955 after a 23-day earthquake swarm. Until March 30, 1956 eruption was of moderate Vulcan character (dokulminatsionnaya stage). During this period, on top of a volcano crater with a diameter of 800 m, from which the majority of emissions of ash to a height of 2-7 km. In late November, the crater began squeezing viscous lava dome. Along with the growth of the dome began vnutrikraternogo strong swelling the southeastern slope of the volcano. The strain, estimated by the photos, up to 100 m of the slope deformation was related to the fact that part of the magmatic melt implemented as an kriptokupola (subsurface intrusions) in the volcano.

    Catastrophic eruption of March 30, 1956 (the culminating stage) was triggered collapse of the eastern slope of the volcanic edifice of 0.5 cu. km. Collapse transformed into cold (<100 C) avalanche, speed exceeding 60 m / s. Debris avalanche formed three branches nested in river valleys. The maximum distance (22 km) was the central branch. During distribution of debris avalanche rip off and pushed in front of the foot of the volcano shaft material (snow, soil, alluvium, vegetation), which formed the extensive mudslides. Just behind the collapse followed kastrofichesky directed blast, caused by the fact that the collapse of sharply reduced lithostatic pressure on the magma, to infiltrate the building on dokulminatsionnoy stage of eruption. The material ejected by the explosion (0.2 cubic km), spread along the eastern foot of the volcano in the form of pyroclastic surges (turbulent flow of hot mixture of gas and pyroclastics). The flow rate of greater than 60 m / s, the temperature was about 300 degrees C. The directional explosion erupted pyroclastic flows over 20 km. Height of the eruption cloud eruption reached a height of about 35 km. The eruption formed a horseshoe-shaped crater diameter of ~ 1.3 km, open to the east. At the eastern foot of the volcano in an area of ~ 500 km ^(2) the trees and bushes were broken and flattened in the direction of the volcano. In the zone of destruction emerged cover specific pyroclastic deposits (deposits directed explosion). After a paroxysm (postkulminatsionnaya stage) in horseshoe-shaped crater began squeezed viscous lava dome, whose formation continues to the present time.






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