Figure 1: Observed GPS (solid lines) and model NUVEL-1 [ DeMets et al., 1990]
(dashed lines) baseline rates of change, with their 95% confidence ellipses.
Baseline rates of change measure the relative motion of two GPS sites. The
Caribbean-North Andes plate motion rate is based on only two epochs of GPS
data (1988 and 1991), and the uncertainty given is conservative. GPS
sites used in this study are indicated by squares; other GPS sites are
indicated by circles. Reprinted from Freymueller et al. [1993].
Figure 2: Observed velocity of stations relative to the Pacific plate
estimated from the combined GPS and VLBI data set. The ellipses denote
the region of 95% confidence. For clarity, the ellipses are not shown
for the sites in the Ventura Basin. Reprinted from Feigl et al.
[1993].