Joe Sherrod, University of Washington, Seattle, United States, Harvey M Kelsey, Humboldt State University, Arcata, CA, United States, Lydia Staisch, USGS, Menlo Park, CA, United States, Alison R Duvall, University of Washington, Seattle, WA, United States and John P Lasher, USGS, Earthquake Science Center - Seattle Field Office, Seattle, WA, United States