Contemporary global horizontal crustal motion

SUMMARY An analysis of Satellite Laser Ranging (SLR) data to the LAGEOS satellite has yielded improved estimates of the horizontal motion for a subset of 34 tracking sites within the global tracking network. The analysis, called SL8.3, utilized data acquired between 1980 January and 1993 June by the global network composed of 71 sites. The solution design provides for the simultaneous estimation of site positions and their velocities within a pre-defined kinematic frame. The solution is statistically rigorous and retains the full correlation information content. Least-squares estimates of relative poles of rotation, which are used to model the motion of one plate relative to another, were made based on the SLR estimated velocities for sites known to be well away from deformation zones. The resulting SLR-based relative rotation poles differ slightly from those of NUVEL-1, but in general, indicate that the magnitude of the SLR implied velocities is slower than those implied by NUVEL-1, consistent with the 4-5 per cent slowing in relative spherical rates noted in earlier comparisons. Spherical rates between sites in western North America support models of extension in the Basin and Range Province and the rotation of the Sierra Nevada microplate. An analysis of the spherical rates crossing the North Atlantic shows that SL8.3 estimated extension between North America-Eurasia sites is generally smaller than those implied by NUVEL-1; meanwhile SL8.3 rates between North America-Africa sites are in better agreement with NUVEL-1, although they are not so well determined. The maintenance and ongoing monitoring of global SLR site kinematics provides a well-defined global reference which will aid in combination global kinematic solutions where information from other technologies are merged (e.g. Very Long Baseline Interferometry and Global Positioning System) and in providing the context for densification studies of regional kinematics derived from terrestrial and Global Positioning System observations.

[1]  Richard G. Gordon,et al.  No-net-rotation model of current plate velocities incorporating plate motion model NUVEL-1 , 1991 .

[2]  Richard G. Gordon,et al.  Current plate motions , 1990 .

[3]  James Jackson,et al.  Active tectonics of the Adriatic Region , 1987 .

[4]  David E. Smith,et al.  Tectonic motion and deformation from satellite laser ranging to LAGEOS , 1990 .

[5]  A. Baksi.  Concordant sea-floor spreading rates obtained from geochronology, astrochronology and space geodesy , 1994 .

[6]  David E. Smith,et al.  Precision orbit determination at the NASA Goddard Space Flight Center , 1990 .

[7]  T. Jordan,et al.  Vector constraints on western U.S. deformation from space geodesy, neotectonics, and plate motions , 1987 .

[8]  James Jackson,et al.  Active tectonics of the north and central Aegean Sea , 1991 .

[9]  Thomas H. Jordan,et al.  Present‐day plate motions , 1977 .

[10]  A. Cazenave,et al.  Tectonic plate motions derived from LAGEOS , 1991 .

[11]  J. W. Siry,et al.  Gravity model improvement investigation. [improved gravity model for determination of ocean geoid , 1973 .

[12]  J. Walker,et al.  Variations across and along a major continental rift: An interdisciplinary study of the Basin and Range Province, western USA , 1992 .

[13]  D. Albarello,et al.  Deformation pattern in the central Mediterranean and behavior of the African/Adriatic promontory , 1990 .

[14]  Steven N. Ward,et al.  Constraints On the Seismotectonics of the Central Mediterranean From Very Long Baseline Interferometry , 1994 .

[15]  Douglas S. Wilson,et al.  Confirmation of the astronomical calibration of the magnetic polarity timescale from sea-floor spreading rates , 1993, Nature.

[16]  D. Argus,et al.  Current Sierra Nevada-North America motion from very long baseline interferometry:Implications for the kinematics of the western United States , 1991 .

[17]  H. Philip,et al.  Modern tectonic stress field in the Mediterranean region: evidence for variation in stress directions at different scales , 1992 .

[18]  David E. Smith,et al.  Horizontal crustal motion in the central and eastern Mediterranean inferred from satellite laser ranging measurements , 1994 .

[19]  C. Reigber,et al.  Plate Motions Derived from the DGFI 89 L03 Solution , 1990 .

[20]  David E. Smith,et al.  LAGEOS geodetic analysis-SL7.1 , 1991 .

[21]  F. Hilgen.  Extension of the astronomically calibrated (polarity) time scale to the Miocene/Pliocene boundary , 1991 .