Eur. Phys. J. B 44, 115-117 (2005)
https://doi.org/10.1140/epjb/e2005-00106-7

Scale-invariant statistics of period in directed earthquake network

¹ Institute of Physics, University of Tsukuba, Ibaraki 305-8571, Japan
² College of Science and Technology, Nihon University, Chiba 274-8501, Japan

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Received: 17 November 2004
Published online: 16 April 2005

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.