Inversion of Pn travel times for lateral variations of Moho geometry beneath the central Andes and comparison with the receiver functions

David Baumont, Anne Paul, George Zandt, Susan L. Beck

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

We inverted the Pn travel times to characterize the geometry of the Moho along a profile across the Central Andes (20°S) where previous workers have estimated the crustal thickness using receiver functions. Contrary to receiver functions, this technique is not sensitive to the crustal V3. Therefore, the comparison of the two approaches provides valuable complementary information. Overall, our results are in good agreement with those based on receiver functions. However, some important discrepancies are observed beneath the Western Cordillera and the Subandes, where we find crusts 10-km thinner than in previous models. We confirm that the central part of the orogen appears to be isostatically compensated by the presence of a thick crust. However, at both edges, the topography probably requires additional support, low-density mantle beneath the Western Cordillera and a strong flexural support of the Brazilian shield beneath the Subandes.

Original languageEnglish (US)
Pages (from-to)1663-1666
Number of pages4
JournalGeophysical Research Letters
Volume28
Issue number8
DOIs
StatePublished - 2001

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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