It remains disturbing that AVO analysts still cling to the term Poisson's ratio (see e.g., Dutta, TLE February 2002).

In 1990 (TLE) Leon Thomsen pointed out that it is both unnecessary and confusing to approach the VP/VS ratio (my PS ratio) by way of Poisson's ratio. Gretener (TLE, 1994) showed that it is also erroneous resulting in values that from a mechanical perspective are unacceptable, if not ludicrous. Domenico's (TLE, 1995) and Thomsen's (TLE, 1996) replies remain unconvincing and have never been challenged.

The dispute centers on the so-called...
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