Mian Liu, University of Missouri, Geological Sciences, Columbia, MO, United States, Gang Luo, Wuhan University, School of Geodesy and Geomatics, Wuhan, China, Zhong-Hai Li, Chinese Academy Geological Sciences, Beijing, China, Tian Lei, University of Chinese Academy of Sciences, Beijing, China, Yujun Sun, Chinese Academy of Geological Sciences, Institute of Geomechanics, Beijing, China and Xuzhang Shen, Sun Yat-Sen University, Guangzhou, China