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For investigating surface source behavior, the previously described notion of finite stresses and strains in a medium can be readily applied to
surface source of different types. Multicomponent impulsive or vibratory
sources could generate a region in the subsurface in which such
nonlinear behavior is appropriate. However such a region might be relatively
small compared to the source wavelength.
For data processing a far field description with an effective source is more
efficient. It allows a different parameterization of source behavior
depending on the experiment type and the data itself.
However, for modeling of source behavior in order to test source equalization
schemes, such as described by Karrenbach 1992,
it is valuable to have numerical algorithms that allow accurate modeling
of nonlinear source behavior.

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Stanford Exploration Project

11/16/1997