USGS, Alaska Science Center, 4210 University Dr, Anchorage, AK 99508, United States
National Park Service, 240 W. 5th Ave, Suite 236, Anchorage, AK 99501, United States
University of California, Irvine, Earth System Science Dept, B321 Croul Hall, Irvine, CA 92697, United States
Carpenter Microsystems, Inc., 60 Spring Valley Drive NE, Iowa City, IA 52240, United States ; University of Iowa, Department of Geosciences, 121 Trowbridge Hall, Iowa City, IA 52242, United States