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Inherent in the passive seismic imaging experiment is the troublesome
coexistence of the direct source phase and its excited ghost
reflections that image the subsurface. Akin to the multiple problem
in conventional seismic, I propose to attack the direct waves as noise
in the framework outlined by Guitton et al. (2001).
Whereas his methodology is effective at separation of signal and noise
models, building an
appropriate noise model is often the most limiting aspect of the technique.
I propose a method to reconstruct the parameters of the
impinging direct wave that is responsible for the image point in the
reflection in order to build the noise model. Alternatively, it is
possible to separate the recorded wave field into its up-going and
down-going constituents if one has all three components of the
displacement recorded at the surface. Both of these methodologies
will be discussed herein. The concepts are not mutually exclusive.
Next: data=signal + noise
Up: Artman: Coherent noise in
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Stanford Exploration Project
6/8/2002