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《Chinese Journal of Geophysics》 2005-06
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Theoretical and experimental research on self-potential tomography

LONG Hai-Li,HAO Jin-QiInstitute of Geophysics,China Earthquake Administration,Beijing 100081,China  
In order to reveal the physical mechanism of self-potential anomaly,this paper extends the theoretical method on SP tomography under the condition of half-infinite 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.
【Fund】: 国家“十五”科技攻关项目(2001BA601B02)资助
【CateGory Index】: P319
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