Contributions of Space Geodesy to Geodynamics: Crustal by David E. Smith, Donald L. Turcotte

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By David E. Smith, Donald L. Turcotte

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Published through the yank Geophysical Union as a part of the Geodynamics Series.

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J. W. Ryan, and D. Capreue,CrustalDynamicsProjectdata analysis-1991: VLBI geodetic results 1979-90, NASA Technical Memo 104552, Greenbelt, MD, 1992. , Slip vectorsand stretchingof the Sumatranforearc, Geology,19, 881-884, 1991. McKeown, F. , and L. C. S. Geol. Surv. Prof. Paper 1236, 1982. Meertens, C. , and R. B. Smith, Crustal deformationof the Yellowstone caldera from first GPS measurements:1987-1989, Geophys. Res. , 18, 1763-1766, 1991. Minster,J. , and T. H. Jordan,Present-day platemotions,J.

3 mm/yr, shownin Figure 8. Along the Given the geometryof the networksinvolved,the geodesic easternseaboardof the United States the relative geodesic rates acrossthe North Atlantic provide mostly directional rate between Greenbelt and Richmond is 0 + 1 mm/yr; informationin the estimationof motionvectorsin Europe. betweenGreenbeltandHaystack,-1 + 1 mm/yr; andbetween The magnitudes of the vectors are determined from Haystackand Richmond0 + 1 mm/yr. 3 mm/yr. evident that north-southrate information is significantly 30 ROBBINS E'r AL.

In this particular combinedsolution, rate is 2 + 3 mm/yr and between Ely and Quincy, 4 + 3 mm/yr. the North Atlantic VLBI geodesic rates are in better Across the central and eastern part of the United States, agreementwith NUVEL-1 than SLR but sincethe input SLR there is little evidenceof significantintra-platedeformation. rates acrossthe North Atlantic outnumberthe input VLBI For example, for lines connectingPlatteville to Greenbelt, rates by a factor of five, the SLR information dominates. Westford, and Richmond, the rates are 1 + 1, 2 + 1, and -1 + It is also notable that the error ellipsesassociatedwith the 1 mm/yr, respectively.

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