<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Evidence of clustering and nonstationarity in the time distribution of large worldwide earthquakes"^^ . "The purpose of this paper is to characterize the statistical distribution of worldwide\nlargest earthquakes. We analyze the distribution of worldwide shallow events with\nM s 7.0+ since 1900, by following the Occam’s razor philosophy; we start from the\nsimplest possible model (stationary Poisson process), and we inspect more complicated\nmodels only if the data show significant departures from the simplest one. The results\nshow two important characteristics; first, worldwide M s 7.0+ earthquakes tend to cluster in\ntime and space, with features similar to smaller events. Second, for some seismic\nregions there is evidence in favor of long-term fluctuations of the earthquake rate. These\nresults support the hypothesis of universality, suggesting that an ETAS model with a\nbackground varying with time can be considered reliable to describe the seismicity\ndistribution over a wide space-time-magnitude window. From a practical point of view,\nour findings suggest that the paradigm that seismic zones are stationary systems, implicitly\nassumed in seismic hazard assessment, should be regarded with caution."^^ . "2007-02-15" . . "112" . "B2" . . "American Geophysical Union"^^ . . . "Journal of Geophysical Research"^^ . . . "01480227" . . . . . . . . . . "Warner"^^ . "Marzocchi"^^ . "Warner Marzocchi"^^ . . "Anna Maria"^^ . "Lombardi"^^ . "Anna Maria Lombardi"^^ . . "Instituto Nazionale di Geofisica e Vulcanologia, Rome, Italy"^^ . . . "Instituto Nazionale di Geofisica e Vulcanologia, Bologna, Italy"^^ . . . . . . "HTML Summary of #1367 \n\nEvidence of clustering and nonstationarity in the time distribution of large worldwide earthquakes\n\n" . "text/html" . . . "Stationarity testing" . . . "Clustering and migration" . .