Experimental changes of the Hurst exponent behavior of the Geoelectrical Potential and its possible relation to the changes of spectral power-law exponent of the seismic activity in Western Greece

This paper presents observations of the long-term Geoelectric Potential Difference. The data have been collected during a five-year (1993-1997) experimental investigation. For data acquisition an automatic system for collection, transfer and processing of Geoelectric measurements operates at the Earthquake prediction section of the University of Patras Seismological Laboratory (UPSL). The emphasis in this work is given towards investigation of experimental changes of the Hurst exponent behavior of the geoelectrical potential difference and its possible relation with the changes of the spectral power-law exponent of the seismic activity in Western Greece. The comparison of both parameters leads to a possible correlation between geoelectrical time fluctuations and earthquakes in the seismic area. A theoretical explanation of the above results is also given.