1. University of Science and Technology of China, School of Earth and Space Sciences, Hefei, China, University of Science and Technology of China, Mengcheng National Geophysical Observatory, Hefei, China, and University of Science and Technology of China, Institute of Advanced Technology, Center for Advanced Geophysical Sensing and Intelligent Exploration, Hefei, China.
2. University of Science and Technology of China, School of Earth and Space Sciences, Hefei, China, University of Science and Technology of China, Mengcheng National Geophysical Observatory, Hefei, China, and University of Science and Technology of China, Institute of Advanced Technology, Center for Advanced Geophysical Sensing and Intelligent Exploration, Hefei, China. (corresponding author)
3. Research Institute of Hunan Provincial Nonferrous Metals Geological Exploration Bureau, Changsha, China.
4. Chinese Academy of Sciences, Institute of Geology and Geophysics, Key Laboratory of Earth and Planetary Physics, Beijing, China.