This is probably the best picture of Opala volcano, taken from ESE. The volcano sits on the northern rim of a large Late Pleistocene caldera (a part of the rim is seen in the low right corner of the picture). Opala is a hystorically active volcano; its last large eruption occurred about 300 years ago. Baranii Amphitheater crater, filled with extrusive domes, is at the foreground. It formed about 1500 years BP and produced 9-10 km3 of rhyolitic tephra.
Author(s): Viktor Dvigalo, IVS FEB RAS
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