| Popis: |
A statistical analysis of electric self-potential time series measured in an active seismic region of the state of Guerrero Mexico is presented. The fractal dimension D of these time series is calculated using Higuchi’s algorithm. Most of the time the self-potential time series have D ≈ 2, corresponding to uncorrelated white noise. However, there exist time intervals where D is remarkably less than two, corresponding to correlated signals. There are no clear correlations between D-changes and impending earthquakes. Nevertheless, some weeks before an earthquake M = 7.4 with epicenter 110 km from Acapulco, D reached its lowest value in almost four years. The possibility that D corresponds to charge patterns arising from self-organized critical phenomena is discussed. |
