The steep-sided Kamen stratovolcano lies at the center of a N-S chain of volcanoes, flanked by Bezymianny and Kliuchevskoi. The sharp-peaked, edifice is Kamchatka's second highest volcano, topped only by its neighbor Kliuchevskoi. It formed during the late Pleistocene, but activity continued into the Holocene (Melekestsev et al., 1990). A major slope failure about 1200-1300 years ago removed much of the eastern side of the volcano, producing a massive 4-6 km3 debris avalanche that traveled more than 30 km SE.