Figure after Wong, 2003 showing a shaded relief map of Umnak Island, Okmok Volcano, and Unalaska Island. Shaded relief map published: Schaefer, J. R., 2005, 30-meter shaded relief image of Okmok Volcano, Umnak Island, Alaska: Alaska Division of Geological & Geophysical Surveys Raw Data File RDF 2005-01, 1 CD-ROM. Available at: http://www.avo.alaska.edu/downloads/classresults.php?citid=3799
Image courtesy of the AVO/DGGS.