Abstract
A new 3D-density model of the Central Andean lithosphere and the downgoing Nazca plate has been designed based on more recent constraints given by refraction seismics and seismology. Offset-free modelling is achieved by fitting both gravity and geoid with one density structure and by modelling relative to a reference density structure. Contributions to the Central Andean geoid by some principal parts of the lithosphere are calculated and displayed along a WE trending profile at 20°S. The distribution of the model masses down to mantle regions is used to investigate the isostatic state of the lithosphere model in comparison to Airy and Vening-Meinesz isostatic models.
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