Directionality of surface high-frequency geoacoustic emission during deformational disturbances

Changes in the directionality of surface high-frequency geoacoustic emission during periods of deformational disturbances on the diurnal time scale prior to strong seismic events on Kamchatka have been investigated. It has been shown that while the emission intensity grows by over an order of magnitude, sharp maxima appear in the direction of longitudinal acoustic oscillations. Based on their position, the orientation of the major compression axis can be determined, whose chaotic motion exhibits two metastable states around the direction to the epicenter of the earthquake.