Abstract

Modeling of the Process of Interaction of Infrasonic Acoustic and Seismic Waves

V.V.Kovalevsky (Institute of Computational Mathematics and Mathematical Geophysics, SB RAS, Novosibirsk, Russia)

e-mail: vvkov@opg.sscc.ru

The paper is devoted to the modeling of the process of interaction of infrasonic acoustic and seismic waves radiated by powerful seismic vibration sources. This effect was detected in experiments with powerful vibrational sources of seismic waves, carried out at the vibroseismic test site of Siberian Branch of RAS. The 2-D problem of the excitation of the surface seismic wave by the acoustic wave caused by the interaction of a harmonic wave in the air with an elastic half-space with low velocity layer is considered. The conditions of the resonance increase of the amplitude of the induced surface seismic wave are determined. It was shown if the velocity of Rayleigh waves for the elastic half-space coincides with the velocity of the acoustic wave, resonant increase in the amplitude of surface waves takes place. In the case of the presence of low velocity layer in the ground it takes place the occurrence of number of resonance, connected with the resonant properties of the layer and its interaction with the surface waves of this system.

Section : 6