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Previous: Field Data: are they reciprocal ?
Up: Vector Wave Reciprocity
Next: Summary
Previous Page: Field Data: are they reciprocal ?
Next Page: Summary
Differences in reciprocal trace pairs can have many causes. One reason can be the uncertainty in source and receiver positioning, or in case of multi-component sources the misalignment of components. These two causes have nothing to do with the medium itself, but rather are purely geometrical effect. It may also be that a source is not behaving identically at each location. Nonlinearities in the source surface interaction and noise may prevent exact duplication of otherwise reciprocal data. Nonlinearity is important in this aspect, since Green's functions are for linear equations and nonlinear effects have unknown consequences for reciprocity. If we assume that noise is random with respect to the reciprocal experiment and that receivers respond reasonably isotropically, we can blame mismatches mainly on the source.