Affiliation: | Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan, Hubei 430074, China,Department of Physics, University of Alberta, Edmonton, Alberta T6G 2R3, Canada,Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan, Hubei 430074, China and USGS, 345 Middlefield RD, MS 977, Menlo Park, CA 94025, USA |