Applied Physics Division, Los Alamos National Laboratory, PO Box 1663, Los Alamos, NM 87545, ; Earth and Planetary Sciences Department University of California Santa Cruz, 1156 High St., Santa Cruz, CA 95064
Earth and Planetary Sciences Department University of California Santa Cruz, 1156 High St., Santa Cruz, CA 95064
Applied Physics Division, Los Alamos National Laboratory, PO Box 1663, Los Alamos, NM 87545
Earth and Environmental Sciences Division, Los Alamos National Laboratory, PO Box 1663, Los Alamos, NM 87545
Earth and Planetary Sciences Department University of California Santa Cruz, 1156 High St., Santa Cruz, CA 95064
Physics of Geological Processes Dept., University of Oslo, PO Box 1048 Blindern, Oslo, 0316, Norway