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3D-density modelling with seismic constraints in the Central Andes

Authors
Journal
Physics and Chemistry of the Earth
0079-1946
Publisher
Elsevier
Publication Date
Volume
21
Issue
4
Identifiers
DOI: 10.1016/s0079-1946(97)00050-5
Disciplines
  • Design
  • Earth Science
  • Geography

Abstract

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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