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First GPS baseline results from the north Andes
Author(s) -
Kellogg James N.,
Freymueller Jeffrey T.,
Dixon Timothy H.,
Neilan Ruth E.,
Clemente Ropain U.,
Sergio M. Camargo,
Benjamin Fernandez Ch.,
Stowell James L.,
Salazai Anibal,
Jaime Mora V.,
Espin Luis,
Perdue Ver,
Leos Leonard
Publication year - 1990
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl017i003p00211
Subject(s) - baseline (sea) , geodesy , global positioning system , geology , trench , epoch (astronomy) , deformation (meteorology) , seismology , oceanography , physics , telecommunications , computer science , stars , chemistry , organic chemistry , layer (electronics) , astronomy
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 10 8 for short baselines (100–1000 km), and better than 3 parts in 10 8 for long baselines (>1000 km). 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.