Abstract
Taking the graph of the apparent resistivityρ yx in Lanzhou area, its geomagnetic transfer function variations and the investigation of moderate-strong local earthquakes as example and from the viewpoint of seismomagnetic effect, the authors found that subterranean conductivity values might be applied to the division of Lanzhou area from the surface downward into four layers, i. e., the anomalous, the transitional, the non-anomalous and the anomalous layer. Only the transfer function modular |A| and |B|, magnetic azimuth α P with its variance Δα P , and the total varianceσ z in the anomalous layers showed obvious anomalies with time changes. Thus, it could be conjectured that the anomalous layer was closely associated with the anisotropic variations of conductivity of the subterranean media in the seismicity area. This phenomenon might provide a way to the further study of its mechanism. It is needed to study the inherent connotation deeply.
Published Version
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