Positive Feedback, Memory and the Predictability of Earthquakes

Details Positive Feedback, Memory and the Predictability of Earthquakes Positive Feedback, Memory and the Predictability of Earthquakes

2001-07-06

arxiv.org/abs/cond-mat/0107143v1

Proc. Nat. Acad. Sci. USA 99 SUPP1:2501-2508 (2002)

Physics

Condensed Matter

Statistical Mechanics

PostScript document of 18 pages + 2 eps figures

Scientific paper

We review the "critical point" concept for large earthquakes and enlarge it in the framework of so-called "finite-time singularities". The singular behavior associated with accelerated seismic release is shown to result from a positive feedback of the seismic activity on its release rate. The most important mechanisms for such positive feedback are presented. We introduce and solve analytically a novel simple model of geometrical positive feedback in which the stress shadow cast by the last large earthquake is progressively fragmented by the increasing tectonic stress. Finally, we present a somewhat speculative figure that tends to support a mechanism based on the decay of stress shadows. This figure suggests that a large earthquake in Southern California of size similar to the 1812 great event is maturing.

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