Turbulent-Like Behavior of Seismic Time Series

Details Turbulent-Like Behavior of Seismic Time Series Turbulent-Like Behavior of Seismic Time Series

2009-02-25

arxiv.org/abs/0902.4331v1

Phys. Rev. Lett. 102, 014101 (2009)

Physics

Geophysics

12 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.102.014101

We report on a novel stochastic analysis of seismic time series for the Earth's vertical velocity, by using methods originally developed for complex hierarchical systems, and in particular for turbulent flows. Analysis of the fluctuations of the detrended increments of the series reveals a pronounced change of the shapes of the probability density functions (PDF) of the series' increments. Before and close to an earthquake the shape of the PDF and the long-range correlation in the increments both manifest significant changes. For a moderate or large-size earthquake the typical time at which the PDF undergoes the transition from a Gaussian to a non-Gaussian is about 5-10 hours. Thus, the transition represents a new precursor for detecting such earthquakes.

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