Mt. Nepriyatnaya (“Unpleasant”) forms the summit of the volcanic massif. Two lava bodies, formed during the most recent eruption (1600 14C yrs BP), descend from Mt. Nepriyatnaya to the south and to the north. While the south lava body (at the right) is a normal thick lava flow with well-expressed marginal levees, the specific topography of the northern body (at the left) likely indicates that it originated due to a sector collapse of the main dome. Lava flows, which come from Mt. Nepriyatnaya towards the Vitaminnoe Lake, formed about 4500 yrs BP. Lava domes of different ages are seen at the right. Kurile Lake caldera, Iliinsky and Zheltovsky volcanoes are seen at the background.
Author(s): Nikolai Smelov, IVS FEB RAS
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