%0 Journal Article
%@ 0094-8276
%A Sornette, Anne
%A Sornette, Didier
%A Laboratoire de Physique de la Matiere  Condensee, CNRS  UMR  6622 and Universite  de  Nice-Sophia Antipolis, Nice, France,
%A Department of Earth  and Space Sciences and Institute of  Geophysics and Planetary Physics, University of California, Los Angeles, CA,
%D 1999
%F epos:1504
%I American Geophysical Union
%J Geophysical Research Letters
%N 13
%P 1981-1984
%T Renormalization of earthquake aftershocks
%U https://episodesplatform.eu/eprints/1504/
%V 26
%X Assume that each earthquake can produce a series of aftershock independently of its size according to its “local” Omori's law with exponent 1 + θ. Each aftershock can itself trigger other aftershocks and so on. The global observable Omori's law is found to have two distinct power law regimes, the first one with exponent p− = 1-θ for time t < t* ∼ κ^(−1/θ), where 0 < 1 − κ < 1 measures the fraction of triggered earthquakes per triggering earthquake, and the second one with exponent p+ = 1 + θ for larger times. The existence of these two regimes rationalizes the observation of Kisslinger and Jones [1991] that the exponent p seems positively correlated to the surface heat flow: a higher heat flow is a signature of a higher crustal temperature, which leads to larger strain relaxation by creep, corresponding to fewer events triggered per earthquake, i.e. to a larger κ, and thus to a smaller t*, leading to an effective measured exponent more heavily weighted toward p+ > 1.