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Authors: Faenza, L.* 
Marzocchi, W.* 
Serretti, P.* 
Boschi, E.* 
Title: On the spatio-temporal distribution of M 7.0+ worldwide seismicity with a non-parametric statistics
Issue Date: 2007
DOI: 10.1016/j.tecto.2007.11.066
Keywords: Earthquake spatio-temporal distribution
World Wide Seismicity
Temporal cluster
Subject Classification05. General::05.01. Computational geophysics::05.01.04. Statistical analysis 
Abstract: The aim of this paper is to provide some constrains on the time behavior of earthquake generation mechanism, through the usage of a non-parametric statistics that leads up to the empirical estimation of the hazard function. The results indicate that the most characterizing temporal feature for large (M 7.0+) worldwide shallow earthquake occurrence is a clustering lasting few years, indicating that the probability of earthquake occurrence is higher immediately after the occurrence of an event. After that, the process becomes almost time independent, as in a Poisson process. Remarkably, this time clustering is very similar to what previously found for different spatio-magnitude windows, and it does not seem to depend on the tectonic style of the region. This may support the hypothesis of an universal law for earthquake occurrence.
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