Abstract
Spatial distribution of acoustic and elastic waves generated by an elementary vibration source at seismic profiling frequencies in an infinite medium close to a layer inclusion, i.e., an extended layer, is numerically simulated. Point dipole radiation in a homogeneous infinite medium separated by a liquid layer of different medium density or acoustic wave velocity is considered. Transverse elastic SH-waves excited by an oscillating power source in a solid medium also located close to the layer of different propagation velocity than the velocity of the vicinity are analyzed. Formulae for the spatial distribution of the wave field amplitude are derived and computer graphics of field distribution images is presented. Wave reflection, penetration deep into the layer inclusion, and transmittance through it are examined. Results of the analysis can be applied to seismoacoustic probing of geologic environment by the near field of a harmonic vibration source.
Highlights
New methods of acoustic remote diagnostics of materials and vibroseismic probing of geologic environment are actively developing
Spatial distribution of acoustic and elastic waves generated by an elementary vibration source at seismic profiling frequencies in an infinite medium close to a layer inclusion, i.e., an extended layer, is numerically simulated
The problem analyzed in the paper can be formulated as numerical simulation and visualization of the structural features of the near field of a harmonic acoustic source located close to a layer inclusion characterized by a jump of wave velocity or density relatively to the analogous parameter of the ambient homogeneous medium
Summary
New methods of acoustic remote diagnostics of materials and vibroseismic probing of geologic environment are actively developing now. The problem analyzed in the paper can be formulated as numerical simulation and visualization of the structural features of the near field of a harmonic acoustic (vibration) source located close to a layer inclusion characterized by a jump of wave velocity or density relatively to the analogous parameter of the ambient homogeneous medium. We consider patterns of the spatial amplitude distribution of the z-component of wave displacements, which are obtained as a result of numerical simulation using Formula (5) for the same values of acoustic wave velocity jump in the media located inside and outside the layer, i.e., for the waveguide propagation c c C. It can be noted that the illustrations confirm our statements only qualitatively; the problem of frequency choice optimization required for practical acoustic probing is not considered
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