Geoid undulation on the Andean Cordillera.

INTROCASO, ANTONIO; LENZANO LUIS E.; ROBIN, A. M.; MACKERN, M. V.

Buenos Aires

Simposio; GEOSUR2004. International Symposium on the Geology and Geophysics of the Southernmost Andes, The Scotia Arc and the Antartic Peninsula; 2004

Instituto de Geofísica-UNde Rosario.Argentina

Gravity field distortion can be developed: a) from gravity anomalies (traditional method); b) from geoid undulations (modern method); c) from both a) and b). In this work we build a geoid undulation profile on an Andean section at 33º South latitude from an equivalent sources technique. We compare it with an EGM96 model and we test it in the Argentine Andes with (h-H) measured values. Isostatic undulation in Airy model, compared with residual undulation in Andean wavelengths, points out a reasonable balance, agreeing with previous seismic and gravimetric studies. Because of this, we consider geoid undulations as another instrument ? that can be independent or complementary to the traditional ones ? to carry on tectonic studies of geologic structures.