Physical Review Letters 18 March 2005

Phys. Rev. Lett. 94, 108501 (2005)

Earthquakes Descaled: On Waiting Time Distributions and Scaling Laws

Mattias Lindman, Kristin Jonsdottir, Roland Roberts, Bj?rn Lund, and Reynir B?dvarsson

Department of Earth Sciences, Uppsala University, Villav?gen 16, 752 36 Uppsala, Sweden

(Received 28 April 2004; revised 15 October 2004; published 15 March 2005)

Recently, several authors have used waiting time distributions for large earthquake data sets to draw conclusions regarding the physics of earthquake processes. We show, theoretically and by simulation, that a characteristic kink in observed waiting time distributions does not have the physical significance of separating correlated and uncorrelated earthquakes. It also follows from our discussion that the Omori law is not trivially related to a proposed scaling law and that caution must be taken before the spatial scaling exponent of the law is interpreted as a fractal dimension of seismicity. ?2005 The American Physical Society



PACS: 91.30.Dk, 05.65.+b, 89.75.Da

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