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Scattering of elastic waves by localized anisotropic inclusions

 

作者: Ari Ben‐Menahem,   Richard L. Gibson,  

 

期刊: The Journal of the Acoustical Society of America  (AIP Available online 1990)
卷期: Volume 87, issue 6  

页码: 2300-2309

 

ISSN:0001-4966

 

年代: 1990

 

DOI:10.1121/1.399074

 

出版商: Acoustical Society of America

 

关键词: INCLUSIONS;ELASTIC WAVES;SCATTERING;SHEAR WAVES;ANISOTROPY;SCATTERING AMPLITUDES;ELASTIC CONSTANTS;SEISMOLOGY

 

数据来源: AIP

 

摘要:

The existence of Rayleigh scattering of elastic plane waves by anisotropic homogeneous inclusions is theoretically demonstrated. The case of transverse isotropy is studied in detail. It is shown that a scattered longitudinal wave creates radial‐longitudinal (P), collatitudinal‐shear (SV), and azimuthal shear waves (SH). Likewise, scatteredSVandSHwaves, each generate radialPwaves andSVandSHshear waves. All scattered amplitudes are proportional to the square of the frequency and have radiation pattern signatures as those of equivalent dipoles, center of compression, and double couples. It is shown that observations of spatial patterns of scattered amplitudes can yield, through inversion, the elastic constants of the anisotropic inclusion. The results obtained can serve as a theoretical basis for the observed short‐periodSHandSVwaves from underground explosions at teleseismic distances.

 

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