TRAVELTIMES OF WAVES IN THREE-DIMENSIONAL RANDOM MEDIA
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dc.contributor.author | Baig A.M. | |
dc.contributor.author | Dahlen F.A. | |
dc.contributor.author | Hung S.H. | |
dc.date.accessioned | 2022-01-24T03:31:16Z | |
dc.date.available | 2022-01-24T03:31:16Z | |
dc.date.issued | 2003 | |
dc.identifier | https://elibrary.ru/item.asp?id=1493269 | |
dc.identifier.citation | Geophysical Journal International, 2003, 153, 2, 467-482 | |
dc.identifier.issn | 0956-540X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/34540 | |
dc.description.abstract | We present the results of a comprehensive numerical study of 3-D acoustic wave propagation in weakly heterogeneous random media. Finite-frequency traveltimes are measured by cross-correlation of a large suite of synthetic seismograms with the analytical pulse shape representing the response of the background homogeneous medium. The resulting 'ground-truth' traveltimes are systematically compared with the predictions of linearized ray theory and 3-D Born-Frechet (banana-doughnut) kernel theory. Ray-theoretical traveltimes can deviate markedly from the measured cross-correlation traveltimes whenever the characteristic scalelength of the 3-D heterogeneity is shorter than half of the maximum Fresnel zone width along the ray path, i.e. whenever $a ≤ 0.5(λL )1/2 $, where a is the heterogeneity correlation distance, λ is the dominant wavelength of the probing wave, and L is the propagation distance. Banana-doughnut theory has a considerably larger range of validity, at least down to $a ≈ 0.1(λL )1/2 $ in sufficiently weakly heterogeneous media, because it accounts explicitly for diffractive wave front healing and other finite-frequency wave propagation effects. | |
dc.subject | BODY WAVES | |
dc.subject | INHOMOGENEOUS MEDIA | |
dc.subject | RAY THEORY | |
dc.subject | TOMOGRAPHY | |
dc.subject | TRAVELTIME | |
dc.subject | WAVE PROPAGATION | |
dc.title | TRAVELTIMES OF WAVES IN THREE-DIMENSIONAL RANDOM MEDIA | |
dc.type | Статья |
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