Aerial view, looking north, over the Ukinrek Maars on the south shore of Becharof Lake on the Alaska Peninsula. The maar craters formed during a 10-day eruption in March and April of 1977. In the distance (center) are the Gas Rocks, an older volcanic center. Photograph by C. Nye, Alaska Division of Geological and Geophysical Surveys, May 9, 1994.
Image courtesy of AVO / Alaska Division of Geological & Geophysical Surveys.