Geoelectric investigation of a pluridirectional fissure system in a karstic area

摘要

Numerous publications are known about a direct geophysical investigation of unidirectional fissure systems, but there have been no reports about the problem of pluridirectional fissure systems. The few surface geophysical methods, which could be potentially used for this purpose, have numerous, probably unresolvable difficulties. In this paper we present an attempt to map the pluridirectional fissure system in a buried limestone surface by combining geoelectrical profiling and geoelectrical azimuthal measurements. Results received by using both the so-called null-, and traditional arrays were jointly interpreted. In case of profiling the null array was used only to verify the traditional array results, while in the azimuthal measurements the null array plays a basic role in the interpretation. The humidity of the fissures affects the measured results significantly, and in a meaningful way.