Lava flows cover large parts of the Okmok caldera floor on NE Umnak Island, some of which erupted during historical time. The small lakes within the caldera are remnants of a larger lake that filled the caldera to depths of more than 200 m before overtopping the rim and eroding a 180-m-deep notch through the northern caldera wall.

Photo by Chris Nye, 1980 (Alaska Division of Geological & Geophysical Surveys, Alaska Volcano Observatory).

This image is made available as a Public Domain Work, but proper attribution is appreciated.

Galleries: Calderas

Keywords: caldera | lava flow

Okmok