Douglas Scott Dreger, University of California Berkeley, Berkeley, CA, United States, Kang Wang, UC Berkeley, Earth and Planetary Science, Berkeley, CA, United States, Elisa Tinti, Istituto Nazionale di Geofisica e Vulcanologia,, Roma, Italy, Roland Burgmann, Univ California Berkeley, Seismological Laboratory, Berkeley, CA, United States and Taka'aki Taira, Univ California Berkeley, Berkeley, CA, United States