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While most are not actively erupting, many are considered dangerous due to their eruptive history and proximity to population centers and air travel corridors.This astronaut photo highlights the summit crater and snow-covered slopes of Avachinshy stratovolcano (2,741 m; 8,993 ft) as it pokes above a surrounding cloud deck.In cases where an imminent threat exists, immediately contact your local law enforcement agencies and provide them with the threat information.To contact the Central Intelligence Agency click here.Low-level stratus clouds approach Matua Island from the east, wrapping around the lower slopes of the volcano.Only about 1.5 km (1 mi) of the coastline of Matua Island (upper center) can be seen beneath the clouds and ash. Russia's eastern Kamchatka Peninsula, which extends far into the Pacific Ocean, includes more than 150 volcanoes.However, with limited staff and resources, we simply cannot respond to all who write to us.

If you have information about these or other national security challenges, please provide it through our secure online form.The structure also indicates that little or no shearing winds were present at the time to disrupt the plume.By contrast, a cloud of denser, gray ash - most probably a pyroclastic flow - appears to be hugging the ground, descending from the volcano summit.Prior to 12 June, the last explosive eruption had occurred in 1989 with eruptions in 1986, 1976, 1954, and 1946 also producing lava flows.This detailed photograph is exciting to volcanologists because it captures several phenomena that occur during the earliest stages of an explosive volcanic eruption.