Extracting the Green’s function of attenuating heterogeneous acoustic media from uncorrelated waves
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- Roel Snieder
- Colorado School of Mines Center for Wave Phenomena and Department of Geophysics, , Golden Colorado 80401
書誌事項
- 公開日
- 2007-05-01
- DOI
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- 10.1121/1.2713673
- 公開者
- Acoustical Society of America (ASA)
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説明
<jats:p>The Green’s function of acoustic or elastic wave propagation can, for loss-less media, be retrieved by correlating the wave field that is excited by random sources and is recorded at two locations. Here the generalization of this idea to attenuating acoustic waves in an inhomogeneous medium is addressed, and it is shown that the Green’s function can be retrieved from waves that are excited throughout the volume by spatially uncorrelated injection sources with a power spectrum that is proportional to the local dissipation rate. For a finite volume, one needs both volume sources and sources at the bounding surface for the extraction of the Green’s functions. For the special case of a homogeneous attenuating medium defined over a finite volume, the phase and geometrical spreading of the Green’s function is correctly retrieved when the volume sources are ignored, but the attenuation is not.</jats:p>
収録刊行物
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- The Journal of the Acoustical Society of America
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The Journal of the Acoustical Society of America 121 (5), 2637-2643, 2007-05-01
Acoustical Society of America (ASA)