Dynamic elastic moduli Elastic moduli 2 Static elastic modulus 2 Anthracite 1 B value 1 Boreholes 1 Coal deposits 1 Collapse deformation 1 Compression testing 1 Deformation 1 Elasticity 1 Gas exploitation 1 Gases 1 Intermediate principal stress 1 Laboratory measurements 1 Laboratory test 1 Methane 1 Oil field equipment 1 Petroleum reservoirs 1 Poisson’s ratio 1 Principal strain 1 Research laboratories 1 S ratio 1 Shaft walls 1 Shale gas 1 Shale gas reservoirs 1 Shear flow 1 Statics and dynamics 1 Strain 1 Twin shear unified strength theory 1