Abstract
In order to reveal the physical mechanism of self-potential (SP) anomaly, the theoretical method of SP tomography based on a semi-infinite space proposed by Patella was extended to a finite boundary condition. With the observational data from a quadrangle, the 2-D tomography of charge occurrence probability is reconstructed. A cuboid sample with square section has been studied through several numerical modeling and experimental investigations, and the charge occurrence and variation with crack extension was revealed clearly. It is found that the position of positive charges with a high probability coincides with the places of fractures in rock sample. It reflects a microscopic process of separation of positive and negative charges at the fracture ends. Thus SP tomography is helpful to deeply understand the physical mechanism of electric field changes during the fracture of rock.
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