1. University of Science and Technology of China, Laboratory of Seismology and Physics of the Earth’s Interior, School of Earth and Space Sciences, Hefei, China and University of Science and Technology of China, Mengcheng National Geophysical Observatory, Mengcheng, China.
2. University of Science and Technology of China, Laboratory of Seismology and Physics of the Earth’s Interior, School of Earth and Space Sciences, Hefei, China and University of Science and Technology of China, Mengcheng National Geophysical Observatory, Mengcheng, China. (corresponding author)
3. The University of Texas at Austin, Jackson School of Geosciences, Bureau of Economic Geology, Austin, Texas, USA.