The Shiveluch volcano last erupted in September 2005, the spokesman said. He added that the resulting plume poses no threat to the local residents of a village 30 kilometers (19 miles) from the volcano, but that there is a danger to aircraft flying near the mountain.
Shiveluch, the northernmost active volcano on Kamchatka, is the second to erupt on the Pacific peninsula in two days.
Local emergency services reported Monday that the Karymsky volcano has increased its activity, spewing ash up to an altitude of 6,900 meters (22,637 feet).
Karymsky is one of Kamchatka's most active volcanoes, and rises to 1,486 meters (4,875 feet) above sea level in the southeast part of the peninsula.
According to experts, there are more that 150 volcanoes on Kamchatka, 29 of them active.