PETROPAVLOVSK-KAMCHATSKY, August 12 (RIA Novosti) - The Shiveluch volcano on the Kamchatka Peninsula in the Russian Far East is emitting ash to the height of 6,000 meters (20,000 feet), the local geophysics service said Sunday.

In the past twenty-four hours, about 170 local tremors have been registered round Mount Shiveluch, Kamchatka's northernmost volcano with an altitude of 3,283 meters (10,771 feet). The volcano began erupting in December 2006.

Satellite-made pictures show that clouds of volcanic ash are spreading to the distance of 90 km (56 miles) southeast of the volcano, posing threat to air flights.

There are more than 150 volcanoes on Kamchatka, 29 of them active.