HR: 0800h
AN: G21B-0495    [Abstracts]
TI: Construction and Application of the Stable North America Reference Frame.
AU: * Herring, T A
EM: tah@mit.edu
AF: EAPS/MIT, 54-820A 77 Massachusetts Avenue, Cambridge, MA 02139, United States
AB: In this talk, we discuss the construction of a stable North American reference frame from the combination of analyses of continuous and campaign GPS measurements at locations in North America. The stable reference frame is established by the alignment of the motions from this combined analysis with an expected glacial isostatic adjustment (GIA) set of motions at stable North American sites whose contemporary motion is believed to be due to only GIA. The root-mean-square (RMS) differences between the aligned velocities and the GIA model are 0.4 mm/yr horizontally and 1.5 mm/yr vertically. The aligned GPS analysis then allows the motions of sites in tectonically active regions to be determined in stable reference frame. The Plate Boundary Observatory (PBO) reference frame is then determined by aligning it to SNARF using sites in both GIA-only areas and in actively deforming regions for those sites that show linear motion. The RMS fit of the PBO reference to SNARF is 0.8 mm/yr and 2.5 mm/yr horizontally and vertically where the velocities in the PBO reference frame are determined form data collected since the start of PBO in 2004. The PBO realization of the SNARF reference frame is then used for daily determinations of positions in the PBO network. Comparison of velocities and time-series of daily realizations of the SNARF and PBO reference frames will be shown and discussed.
DE: 1200 GEODESY AND GRAVITY
DE: 1209 Tectonic deformation (6924)
DE: 1241 Satellite geodesy: technical issues (6994, 7969)
DE: 1243 Space geodetic surveys
DE: 1295 Integrations of techniques
SC: Geodesy [G]
MN: 2007 Fall Meeting