The use of anisotropy to obtain additional information has been increasing. I attribute the increased usage to the growing awareness that what has been traditionally termed noise or the problem is in fact signal and the solution.

The increase in clarity in imaged data when the layer anisotropy, or nonhyperbolic arrivals, is explicitly exploited in the code is the first type of improvement realized from the additional information. Our industry is beginning to obtain the same improved clarity in image when the azimu-thal variations in the traveltimes are correctly and explicitly exploited in the processing code.

The second type of...

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