The long history of VLBI measurements in tectonically active regions have been used in a number of studies to assess the accumulation of strain in these regions. Many of these studies have been based on the annually released analyses of VLBI data provided by the Goddard Space Flight Center (GSFC) VLBI group; the latest being given in Ryan et al. [1993]. These analyses have been used by Argus and Gordon [1991] to study Sierra Nevada-North America motion; by Argus and Lyzenga [1993] to study deformation associated with subduction at the Japan Trench; and Lisowski [1991] as part of a study of global plate motions. Studies that used independent analyses of the VLBI data include Fallon and Dillinger [1992] which examined global plate motions; and Feigl et al. [1993] which used a rigorous combination of VLBI and GPS data in Southern California to build a kinematic description of the accumulation of strain in that region from 1984--1992.