Research Center of Geophysics Exploration, China Earthquake Administration, 104 Wenhua Road, Zhenzhou, 450003 China ; Now at U S Geological Survey, 384 Woods Hole Road, Woods Hole, MA 02543 United States
Institute of Geology, China Earthquake Administration, Dewai Qijiahuozi, Beijing, 100029 China
Research Center of Geophysics Exploration, China Earthquake Administration, 104 Wenhua Road, Zhenzhou, 450003 China