Coring Bear Lake, ~35 km east of Redoubt Volcano (background). Al and Bjorn Werner hammering 20 feet of core tube into the lake bottom to recover volcanic ash erupted from Redoubt and other Aleutian Arc volcanoes.
Image courtesy of AVO / U.S. Geological Survey.
Please cite the photographer and the Alaska Volcano Observatory/U.S. Geological Survey when using this image. Full Resolution.