Electric field around a crack in rock is generated by appearance and subsequent disappearance of charges on a newly created surface. This electric field occurs here and there along a fault plane. We record it as one of seismo-electromagnetic phenomena (SEP). In a simple case, the maximum of the field is proportional to a surface charge density and a total real contact area of a fault plane. A new scaling law between the maximum of seismo-electric field and the earthquake magnitude is got based on the fractal distribution of fault asperities. It can support the VAN group's statistical scaling law.
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