Geoid undulations chart of the San Luis range (Argentina). Geophysical application

In this work we show that it is possible to define the isostatic state of a geological structure using a geoid undulations chart. We have built: (1) a detailed geoid undulations chart of the San Luis range area using (a) the global geopotential model EIGEN CG03C for long wavelength free-air gravity anomalies and geoid undulations, and (b) observed residual free-air gravity anomalies and the equivalent sources method for short wavelength geoid undulations, and (2) a theoretical undulations chart of San Luis range area, involving effects from an isostatically compensated model. By comparing charts (1) and (2) we have found agreement between them, thus indicating the San Luis range is rather well isostatically balanced.