Dong Xu, China University of Geosciences Wuhan, Institute of Geophysics and Geomatics, Wuhan, China, Xiangyun Hu, Hubei Subsurface Multi-scale Imaging Key Lab, Institute of Geophysics & Geomatics, China University of Geosciences (Wuhan), Wuhan, China, Tian-Chyi J Yeh, Univ Arizona, Tucson, AZ, United States and Ronglin Sun, China University of Geosciences Wuhan, School of Environmental Studies, Wuhan, China