Kamchatka, Russia: NASA space-shuttle photograph (left) and spaceborne imaging radar (right), Jet Propulsion Laboratory. Closeup views of Kliuchevskoi volcano during its eruption 30 Sept. 1994. This volcano is one of several on the Kamchatka peninsula, one of the most active segments of the Pacific Ring of Fire. Rapid subduction of the Pacific plate beneath the Asian plate gives rise to the Kamchatkan volcanoes.