Physics and Astronomy Department, San Francisco State University, 1600 Holloway Avenue, San Francisco, Ca 94132, USA
Physics and Astronomy Department, San Francisco State University, 1600 Holloway Avenue, San Francisco, Ca 94132, USA
Physics and Astronomy Department, San Francisco State University, 1600 Holloway Avenue, San Francisco, Ca 94132, USA; Romberg Tiburon Center for Environmental Studies, 3152 Paradise Drive, Tiburon, Ca 94920, USA
Geosciences Department, San Francisco State University, 1600 Holloway Avenue, San Francisco, Ca 94132, USA; Romberg Tiburon Center for Environmental Studies, 3152 Paradise Drive, Tiburon, Ca 94920, USA