FRACTAL APPROACH TO SEARCH FOR THE EARTHQUAKE PRECURSORY SIGNATURES IN GEOPHYSICAL TIME SERIES

Here we summarize our theoretical and experimental works, which demonstrate fractal properties of geophysical fields in seismic active regions - their spatial distributions and temporal variations. In theoretical aspect, we show how the crack network evolves from the state with random, chaotic behavior to the state with fractal, clustered distributions before the main rupture. Also we show that propagation of the coda waves through the fractally distributed cracks leads to the formation of monoscaling power law spectra of the scattered waves. Comparison between theoretically predicted and experimentally observed behaviors of geophysical parameters is drawn. It is shown that fractal approach to geophysical data processing is one of the promising way for monitoring the destruction processes in seismic active areas and thus for development of the earthquake forecasting methods