Institution: | Center for Wave Phenomena, Geophysics Department, Colorado School of Mines, Golden, CO 80401;, USA. E-mail: Institute of Geophysics, Seismology, and Geodynamics, ETH Honggerberg (HPP), Zurich, CH-8093;Switzerland Center for Rock Abuse, Geophysics Department, Colorado School of Mines, Golden, CO 80401;, USA |