In this paper we report the results of two and a half years of measurements of the ground electric field at the Pacific coast of Mexico. The analysis of the voltage itself does not show any distinguishable feature that could be correlated to earthquakes. Fourier analysis, however gives clear patterns of the electric field prior to the four Ms,w > 6 earthquakes that occurred in the zone during the time interval considered.
By means of the box counting method we calculate the fractal dimension D of the distribution of faults, fractures and lineaments in a region of the southern Mexican Pacific coast. The results suggest that in the spatial sense the b-value of the Gutenberg-Richterlaw and the fractal dimension are positively correlated. We also suggest that D depends on the depth of the seismogenic zone.
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