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Russian Geology and Geophysics

2014 year, number 9

INSTABILITY OF LAYERED MEDIA UNDER GRAVITY STRESS

Yu.L. Rebetsky
O.Yu. Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, ul. Bol’shaya Gruzinskaya 10, Moscow, 123995, Russia
Keywords: Potential energy, gravity stress, elastic deformation, elastic compressibility, moduli of elasticity, instability

Abstract

It is proposed to consider data both on the deep density distribution (gravity instability) and the bulk modulus of elasticity on estimation of the stability of layered mountain ranges. It is shown that an increase in bulk elastic rigidity with depth is the stable state of layered media in terms of energy in the field of gravity stress. In the tectonosphere, in which the moduli of elasticity are inverted (decrease) with depth, excess energy of elastic strain of volume change is generated by body forces, and it will determine the instability of the geologic medium.

DOI: http://dx.doi.org/10.1016/j.rgg.2014.08.010