# Scale-invariant statistics of period in directed earthquake network

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## Abstract

The seismic data taken in California is mapped to a growing directed network. Then, statistics of period in the network, which implies that after how many earthquakes an event returns to the initial location, is studied. It is found that the period distribution obeys a power law, showing the fundamental difficulty of statistical estimate of period. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

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