The problem of identifying crack propagation and initiation thresholds in sandstone: Ultrasonic transmission measurements during brittle rock deformation in laboratory experiments

Benedikt Ahrens1, Mandy Duda2 and Erik H Saenger1,2, (1)Bochum University of Applied Sciences, International Geothermal Centre, Bochum, Germany, (2)Ruhr-University Bochum, Institute of Geology, Mineralogy, and Geophysics, Bochum, Germany
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