O.A. Girina1,2, S.V. Ushakov1, Yu.V. Demjanchuk1

1Institute of Volcanology and Seismology, Far East Division of the Russian Academy of Science,
Petropavlovsk-Kamchatsky, 683006;
2Kamchatka State University by Vitus Bering,
683032, Petropavlovsk-Kamchatsky, Pogranichnaya street, 4

Paroxysmal eruption of Young Sheveluch volcano occurred on May 9, 2004. Series of explosions produced a continuous ash cloud, which elevation reached 8-11 km ASL. The cloud stretched to the east-southeast from the volcano toward Ust-Kamchatsk and Bering Island. The deposits of two new pyroclastic flows and pyroclastic surges were explored in the middle part of the southern flank of the volcano. The total volume of the pyroclastic deposits is approximately 0.06 km3. Pyroclastic flow melted snow deposits accumulated since the beginning of the winter and produced extensive mud flows, which traveled for more than 30 km downstream the Bekesh River and destroyed a dam and a part of the road from Klyuchi to Ust’-Kamchatsk.