Department of Geophysics;
College of Geology Engineering and Geomatics;
Chang'an University;
Xi'an 710054;
China;
Key Laboratory of Western China's Mineral Resources and Geology Engineering;
Ministry of Education;
Xi' an 710054;
China;
Institute of Geophysics;
ETH Zürich CH 8092;
Switzerland;
Department of Physics;
University of Adelaide;
Adelaide SA 5005;
Australia;