Okmok volcano in the eastern Aleutian Islands is erupting. The image above was taken by flight attendant Kelly Reeves of Alaska Airlines on July 13, 2008. The volcano is a nested caldera with numerous cones inside the main peak.
This is inside Cone E with its own small lake. The walls consist of layers of lava, spatter, tephra and cross cutting feeder dykes or feeder conduits for magma's ascent to the surface. This image was taken by Christina Neal in September, 2004 and reproduced courtesy of the Alaska Volcano Observatory/USGS.
The eruption is continuing.