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Next Page: Field Data: are they reciprocal ?
Previous: Wave equations and reciprocity
Up: Vector Wave Reciprocity
Next: Field Data: are they reciprocal ?
Previous Page: What does it mean for seismic data ?
Next Page: Field Data: are they reciprocal ?
Knowing that reciprocity holds for arbitrary inhomogeneous and
arbitrary aniso-tropic media, we can
make use of the reciprocity relationship in various ways.
The most commonly used practice is to reduce data acquisition
by assuming ideal recording conditions. Then, only part of the data
have to be collected and the rest can be inferred by invoking the
reciprocity relationship. Under this assumption one has only to collect
,
and
in addition to
,
and
,
because by reciprocity
,
,
.
The emphasis lies here on ``ideal'' conditions. The other option is to claim real world conditions are never ideal and to use the data redundancy to estimate other than material parameters, namely source or receiver variability or classification of noise sources. But to justify such an approach it is very important to determine the degree to which real data typically is ``not reciprocal''. Thus reciprocity measurements give experimenters a much needed handle on how accurate and reproducible their data are.