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Opala Volcano, Russia
The prominent conical Opala volcano, seen here from the east, lies about 50 km west of the main volcanic arc in southern Kamchatka.
The 2475-m-high stratovolcano was constructed at the north end of the 10 x 12 km, 40,000-year-old Opala caldera.
Post-caldera Holocene volcanism also included the extrusion of lava domes and rhyolitic lava flows.
The latest major explosion formed the Barany amphitheater on the SE flank about 1500 years ago.
Mild explosive eruptions of uncertain validity have been reported in historical time.
Steep-sided, conical Opala stratovolcano is one of the most dramatic volcanoes of southern Kamchatka.
The 2475-m-high volcano was constructed during the late-Pleistocene to Holocene at the northern end of the 12 x 14 km, 40,000-year-old Opala caldera.
The volcano has produced andesitic-dacitic lavas and tephras through most of the Holocene.
The latest major explosive eruption formed the prominent Barany Amphitheater on the SE flank about 1500 years ago, producing a voluminous 9-10 cu km regional tephra marker layer of rhyolitic composition.
The 2 x 2.5 km crater is filled by a lava dome 1 km wide.
Mild explosive eruptions have been reported from summit and flank vents at Opala in historical time, although no associated tephra deposits have been found.
Recent tephrochronological work has revealed evidence, however, for a large explosive eruption from the summit crater about 300 years ago.
PHOTO SOURCE: Andrei Tsvetkov, courtesy of the Global Volcanism Program, Smithsonian National Museum of Natural History, used with permission.
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