US Geological Survey, 345 Middlefield Rd., MS 434, Menlo Park, CA 94025 United States ; Stanford University, Dept. Geological and Environemental Science, 320 Braun Hall, Stanford, CA 94305 United States
US Geological Survey, 345 Middlefield Rd., MS 434, Menlo Park, CA 94025 United States
Stanford University, Dept. Geological and Environemental Science, 320 Braun Hall, Stanford, CA 94305 United States
Stanford University, Dept. Geological and Environemental Science, 320 Braun Hall, Stanford, CA 94305 United States