1. College of Geophysics, Chengdu University of Technology, Chengdu, Sichuan, People’s Republic of China
2. College of Engineering and Technology, Chengdu University of Technology, Leshan, Sichuan, People’s Republic of China
3. Geomathematics Key Laboratory of Sichuan Province, Chengdu University of Technology, Chengdu, Sichuan, People’s Republic of China
4. College of Mathematics and Physics, Chengdu University of Technology, Chengdu, Sichuan, People’s Republic of China