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Global Volcanism Program | Image GVP-05335

The 4.5-km-wide Ugashik caldera formed during the late Pleistocene. Five unglaciated Holocene lava domes occupy the caldera, seen here from the east with Upper Ugashik Lake in the background. Peulik has a summit crater that opens to the west and contains a lava dome. Photo by Betsy Yount (Alaska Volcano Observatory, U.S. Geological Survey).

The 4.5-km-wide Ugashik caldera formed during the late Pleistocene. Five unglaciated Holocene lava domes occupy the caldera, seen here from the east with Upper Ugashik Lake in the background. Peulik has a summit crater that opens to the west and contains a lava dome.

Photo by Betsy Yount (Alaska Volcano Observatory, U.S. Geological Survey).

Keywords: caldera | lava dome


Ugashik-Peulik