Mechanism of Deep-focus Earthquakes Anomalous Statistics

Details Mechanism of Deep-focus Earthquakes Anomalous Statistics Mechanism of Deep-focus Earthquakes Anomalous Statistics

2010-03-23

arxiv.org/abs/1003.4448v1

Physics

Geophysics

9 pages, 7 figures

Scientific paper

Analyzing the NEIC-data we have shown that the spatial deep-focus earthquake distribution in the Earth interior over the 1993-2006 is characterized by the clearly defined periodical fine discrete structure with period L=50 km, which is solely generated by earthquakes with magnitude M 3.9 to 5.3 and only on the convergent boundary of plates. To describe the formation of this structure we used the model of complex systems by A. Volynskii and S. Bazhenov. The key property of this model consists in the presence of a rigid coating on a soft substratum. It is shown that in subduction processes the role of a rigid coating plays the slab substance (lithosphere) and the upper mantle acts as a soft substratum. Within the framework of this model we have obtained the estimation of average values of stress in the upper mantle and Young's modulus for the oceanic slab (lithosphere) and upper mantle.

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