$author.xingMing_EN,
$author.xingMing_EN
.2005.Theoretical and experimental research on selfpotential tomography.Chinese Journal Of Geophysics,48(6): 1343-1349,doi:
自电位层析成像的理论与实验研究
龙海丽, 郝锦绮
中国地震局地球物理研究所，北京 100081
Theoretical and experimental research on selfpotential tomography
LONG HaiLi, HAO JinQi
Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
Abstract：In order to reveal the physical mechanism of selfpotential anomaly, this paper extends the theoretical method on SP tomography under the condition of halfinfinite space proposed by Patella(1997), and gains the forward result under the finite boundary condition. With the observational data in the quadrangle space, the 2_D probability tomography of abnormal charges is reconstructed. A cuboid sample with a square section has been studied through several numerical modeling and experimental investigations, and the variation of abnormal charge with crack extension is revealed. It is found that the position of positive charges with a high probability coincides with the places of fractures in the rock sample. It reflects a microscopic process of separation of positive and negative charges at the fracture ends. This SP tomography is helpful to deeply understand the physical mechanism of electric field changes during the fracture of rock.
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