Abstract
We show that the distribution of waiting times between earthquakes occurring in California obeys a simple unified scaling law valid from tens of seconds to tens of years. The short time clustering; commonly referred to as aftershocks; is nothing but the short time limit of the general hierarchical properties of earthquakes. There is no unique operational way of distinguishing between main shocks and aftershocks. In the unified law; the Gutenberg-Richter b value; the exponent -1 of the Omori law for aftershocks; and the fractal dimension d f of earthquakes appear as critical indices.
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