Global Volcanism Program | Image GVP-02247
The major eruption of Raususan about 4,200 years ago was similar in several ways to the 1980 Mount St. Helens eruption. Flank collapse produced a debris avalanche and left a horseshoe-shaped crater that opens to the west. Pyroclastic flows accompanied growth of a lava dome in the new crater. This dacitic dome (right) forms the high point. Several thermal areas occur on the flanks of the central cone.
Photo by Yuri Doubik (Institute of Volcanology, Petropavlovsk).