Abstract

Highly accurate Satellite Laser Ranging (SLR) and Very-Long-Baseline Interferometry (VLBI) have been implemented by the NASA Crustal Dynamics Project and many cooperating groups in many countries to form global SLR and VLBI networks for geodetic measurements of global plate motion, plate deformation, regional deformations in areas of high earthquake activity, and accurate measurements of the Earth's polar motion and changes in rotation rate. These systems are measuring vector baselines between stations to an accuracy of 2–5 cm. New improvements being implemented will improve the accuracy to about 1 cm.

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