Mechanism of deep-focus earthquakes anomalous statistics

Abstract

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; 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.

The peculiarities of cross-correlation between two secondary precursors – Radon and magnetic field variations, induced by stress transfer changes

“…Several remarks should be made. First, the stress of disturb area can be discharged not only by the destruction of the Earth crust (Rusov et al, 2010), but also by the slow mechanisms, for example, by the creep along the breaks. Other mechanisms are also possible, for example, dislocation sliding.…”