Space-geodetic estimation of the nazca-south america euler vector

Details Space-geodetic estimation of the nazca-south america euler vector Space-geodetic estimation of the nazca-south america euler vector

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999e%26psl.171..329a&link_type=abstract

Earth and Planetary Science Letters, Volume 171, Issue 3, p. 329-334.

Physics

76

Scientific paper

GPS data from four sites in the Nazca Plate (Easter Island, Galapagos, Robinson Crusoe and San Felix Islands) and from five sites in the stable core of the South American Plate enabled us to estimate the Euler vector of the Nazca Plate with respect to South America. The observed velocities of Easter Island (6.6 cm/yr at 102.3°), Galapagos (5.1 cm/yr at 90.0°), Robinson Crusoe (6.6 cm/yr at 80.1°) and San Felix (6.0 cm/yr at 82.1°) are significantly slower than the global plate model NUVEL-1A velocites for those four sites. Our estimated Euler pole is located at 48.8°N, 91.7°W with a rate of 0.59°/m.y. The NUVEL-1A and earlier space-geodetic studies give rotation rates that are 20% faster.

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