Bolshoi ("Big") Semiachik is a group of Late Pleistocene-Holocene stratovolcanoes and extrusive domes located within a large caldera. Here we see the massif from the western rim of the caldera (Bort ridge). Bolshoi Semiachik (or Zubchatyi) volcano per se is the large Late Pleistocene edifice at the background. Several Holocene extrusive domes and thermal fields are located west and southwest from the volcano.

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