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Spectral comparison of continuous Global Positioning System and strainmeter measurements of crustal deformation
Author(s) -
Tralli David M.
Publication year - 1991
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 - 10.1029/91gl01184
Subject(s) - global positioning system , geodesy , deformation (meteorology) , geology , noise (video) , spectral density , seismology , multipath propagation , remote sensing , telecommunications , computer science , channel (broadcasting) , oceanography , artificial intelligence , image (mathematics)
Temporal power spectral density models of noise in continuous crustal deformation measurements obtained with the Global Positioning System (GPS) and high‐quality strainmeters are compared. The crossover frequency at which GPS measurement noise is less than that of strainmeters is determined. Assuming GPS precision of 0.1 to 1 cm in horizontal components for baselines up to 100 km in length, local deformation monitoring with GPS may be preferable to strainmeters for observations of short‐term deformation in under 6 months of continuous (at least daily) measurements. Short‐period tropospheric path delays and multipath effects, which may obscure GPS‐determined strain signals in local network measurements, also are discussed.