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 value, the exponent of the Omori law for aftershocks, and the fractal dimension of earthquakes appear as critical indices.
- Received 11 August 2001
DOI:https://doi.org/10.1103/PhysRevLett.88.178501
©2002 American Physical Society