DEFORMATION AND ACOUSTIC PRECURSORS OF EARTHQUAKES

Abstract

Mechanisms of the generation of elastic oscillations in frequency range 0–10 kHz during the final stage of earthquake preparation are studied using geoacoustic methods and observations of deformations in near-surface sedimentary rocks. It is shown that acoustic noises appear as a result of deformation motions in the medium in a stressed state. An increase in the intensity of high-frequency geoacoustic emission in near-surface sedimentary rocks during the final stage of earthquake preparation at a significant distance from their epicenters is caused by an increase in local stresses. Variations in the stresses related to the effect mentioned above have not yet been studied. In the present paper, we consider peculiarities of local deformation at the final stage of the preparation of remote seismic events to study the mechanisms of geoacoustic noise generation in the kilohertz frequency range.