1. College of Geology Engineering and Geomatics, Chang'an University , Xi'an 710054 , China
2. Integrated Geophysical Simulation Laboratory of Chang'an University (Key Laboratory of Chinese Geophysical Society) , Xi'an 710054 , China
3. University of Hamburg, Institute of Geophysics , Hamburg 20146 , Germany
4. Key Laboratory of Intelligent Detection and Equipment for Underground Space of Beijing-Tianjin-Hebei Urban Agglomeration, Ministry of Natural Resources, Hebei GEO University , Shijiazhuang 050030 , China
5. College of Civil Engineering and Architecture, Shandong University of Science and Technology , Qingdao 266590 , China