The highest volcano is Klyuchevskaya Sopka (4,750 m or 15,584 ft), the largest active volcano in the northern hemisphere.[2] The most striking is Kronotsky, whose perfect cone was said by volcanologists Robert and Barbara Decker to be a prime candidate for the world's most beautiful volcano.[3]
In the center of Kamchatka is Eurasia's world famous Geyser Valley which was partly destroyed by a massive mudslide in June 2007.[4]
Deep seismic events and tsunamis are fairly common. Intense volcanism is caused by the subduction of the Pacific Plate.[5] A pair of huge earthquakes occurred off the coast on October 16, 1737, and on November 4, 1952, in magnitudes ~9.3 and 8.2 respectively.[6] More shallow earthquakes were recorded as recently as April 2006.[7]