Abstract

A multifractal analysis of seismicity of three large earthquakes in Chile is made: the Central Zone 1985 (M (W) = 8.0), Antofagasta 1995 (M (W) = 8.1), and Maule 2010 (M (W) = 8.8) earthquakes. The analysis shows that the fractal dimension spectrum D (q) decreases with time before an earthquake. This fact suggests that the spatial distribution of seismic events could form a cluster before a main shock.