1. a Department of Geology , San Jose State University , San Jose, California, 95192
2. b U.S. Geological Survey , 345 Middlefield Road, MS 975, Menlo Park, California, 94025
3. c Department of Geological Sciences , California State University , Northridge, Northridge, California, 91330
4. d Department of Geology and Geophysics , Dennison University , Granville, Ohio, 43023
5. e Department of Geology , University of Kansas , Lawrence, Kansas, 66045
6. f Allan E. Seward Engineering Geology Inc. , 25570 Rye Canyon Rd., Suite G, Valencia, California, 91355