First GPS Baseline Results from the North Andes

Author(s)

James N. Kellogg, University of South Carolina - ColumbiaFollow
Jeffrey T. Freymueller
Timothy H. Dixon
Ruth E. Neilan
Clemente Ropain U.
Sergio Camargo M.
Benjamin Fernandez Ch.
James L. Stowell, University of Colorado at Boulder
Anibal Salazar
Jaime Mora V.
Luis Espin
Vernon Perdue
Leonard Leos

Document Type

Article

Abstract

The CASA UNO GPS (Global Positioning System) experiment (January-February 1988) has provided the first epoch baseline measurements for the study of plate motions and crustal deformation in and around the North Andes. Two dimensional horizontal baseline repeatabilities are as good as 5 parts in 10⁸ for short baselines (100-1000km), and better than3 parts in 10⁸ for long baselines (>1000km). Vertical repeatabilities are typically 4 -6 cm, with a weak dependence on baseline length. The expected rate of plate convergence across the Colombia Trench is 6-8 cm/yr, which should be detectable by the repeat experiment planned for 1991. Expected deformation rates within the North Andes are of the order of 1 cm/yr, which may be detectable with the 1991 experiment.

Publication Info

Published in Geophysical Research Letters, Volume 17, Issue 3, 1990, pages 211-214.

Rights

Kellogg, J.N., Freymueller, J. T., Dixon, T. H., Neilan, R. E., Ropain U., C., Camargo M., S., Fernandez C., B., Stowell, J. L., Salazar, A., Mora. V., J., Espin, L., Perdue, V., & Leos, L. (1990). First GPS baseline results from the North Andes. Geophysical Research Letters, 17 (3), 211-214.

©Geophysical Research Letters 1990, American Geophysical Union