Alex Gama, United States, Amy J Wagner, California State University Sacramento, Sacramento, CA, United States, Jason A Addison, USGS, Geology, Minerals, Energy, & Geophysics Science Center, Menlo Park, CA, United States, John Arthur Barron, USGS, Menlo Park, CA, United States, Joseph A Carlin, Texas A & M University, College Station, TX, United States and Valerie Schwartz, San Francisco State University, Cupertino, CA, United States