Electronic Resource
Oxford, UK
:
Blackwell Publishing Ltd
Geophysical journal international
122 (1995), S. 0
ISSN:
1365-246X
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Geosciences
Notes:
The summation of Gaussian beams in homogeneous layered media has been implemented for 3-D seismic forward modelling in this paper. The Gaussian beam method, which considers a bundle of rays in the vicinity of a central ray with a bell-shaped amplitude, is known as an extended ray method for handling caustics and diffractions. However, owing to the restriction of the paraxial assumption and the lack of a universal beam phase, this method has not been accurately applied to 3-D problems. These difficulties are overcome in this paper by providing (i) the optimal determination of the beam orientation and the beam shape by minimizing their beam widths; (ii) the ranges of validity, such as the beam conditions and the paraxial condition; and (iii) the diffractions of Gaussian beams from edges and tips. Comparisons with other solutions for caustics and diffractions demonstrate the accuracy of this extended method even in singular regions.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1365-246X.1995.tb03544.x
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