Constraints on present-day shortening rate across the central eastern Andes from GPS data

Lisa Leffler*, Seth Stein, Ailin Mao, Timothy Dixon, Michael A. Ellis, Leonidas Ocola, I. Selwyn Sacks

*Corresponding author for this work

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

Two years of continuous GPS data from several sites in South America indicate that Arequipa in the southern Peruvian Andes has a velocity of 13±3 mm/yr (two standard errors) to the northeast with respect to stable South America. We interpret these data as reflecting a combination of elastic strain accumulation associated with a locked Nazca-South America subduction zone and a small amount of crustal shortening across the fold and thrust belt on the eastern margin of the Andes. Models of elastic strain accumulation for fully locked and partly locked subduction zones constrain shortening in the eastern Andes to 0-3 mm/yr (fully locked) and 0-12 mm/yr (partly locked), slower than some geologic estimates averaged over millions of years.

Original languageEnglish (US)
Article number97GL00770
Pages (from-to)1031-1034
Number of pages4
JournalGeophysical Research Letters
Volume24
Issue number9
DOIs
StatePublished - Jan 1 1997

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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    Leffler, L., Stein, S., Mao, A., Dixon, T., Ellis, M. A., Ocola, L., & Selwyn Sacks, I. (1997). Constraints on present-day shortening rate across the central eastern Andes from GPS data. Geophysical Research Letters, 24(9), 1031-1034. [97GL00770]. https://doi.org/10.1029/97GL00770