Jianli Ma^1,2, Thomas Kempka^3,4, Elena Chabab³, Qi Li^2,5 and Michael Kühn^3,4, (1)State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Wuhan, China, (2)UCAS University of Chinese Academy of Sciences, Beijing, China, (3)Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany, (4)University of Potsdam, Institute of Geosciences, Potsdam, Germany, (5)State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, China