Maly Semiachik is located within several nested Pleistocene calderas and composed of three overlapping edifices along a NE-SW line. Activity migrated to the SW, eventually forming the youngest cone, Ceno-Semiachik. It contains the historically active Troitsky crater, which formed during an explosive eruption about 400 years ago. It contains a hot, acidic lake this 1972 photo.

Photo by Oleg Volynets, 1972 (Institute of Volcanology, Petropavlovsk).

This image is made available under the Creative Commons BY-NC 4.0 license terms.

Galleries: Craters

Keywords: crater | crater lake | stratovolcano

Maly Semyachik