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GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,
VOL. 1, NO. 12,
1005,
10 PP., 1999
doi:10.1029/1999GC000011 [Citation]
Crustal motion north and south of the Arica deflection: Comparing recent geodetic results from the central Andes
Hawaii Institute of Geophysics and Planetology, University of Hawaii, Honolulu, Hawaii 96822, USA
Hawaii Institute of Geophysics and Planetology, University of Hawaii, Honolulu, Hawaii 96822, USA
Center for Earthquake Research and Information, University of Memphis, Memphis, Tennessee 38152, USA
Department of Earth, Atmospheric and Planetary Sciences, MIT, Cambridge, Massachusetts 02139, USA
Instituto Geográfico Militar de Chile, Santiago, Chile
Instituto Geográfico Militar de Argentina, Buenos Aires, Argentina
An intercomparison of recent velocity solutions for the Global Positioning System (GPS) networks constructed by the South American-Nazca Plate Project (SNAPP), based in Bolivia and Peru, and our Central Andes GPS Project (CAP), based in Chile and Argentina, indicates a velocity discontinuity of order 10 mm/yr near the boundary between these networks. We suggest that this velocity jump manifests measurement bias in the SNAPP velocity field. Our results indicate that no major slip partioning occurs within the forearc of northern Chile in response to the obliquity of subduction but that Nazca-South America plate convergence is partitioned between the forearc and the backarc regions. The present rate of shortening across the southern part of the sub-Andean belt in Argentina is 8.9 ± 1.6 mm/yr.
Received 26 August 1999; accepted 5 November 1999; published 13 December 1999.
Citation: (1999), Crustal motion north and south of the Arica deflection: Comparing recent geodetic results from the central Andes, Geochem. Geophys. Geosyst., 1(12), 1005, doi:10.1029/1999GC000011.
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