THE CASA-93 GPS CAMPAIGN FOR CRUSTAL DEFORMATION RESEARCH ALONG THE SOUTH CARIBBEAN PLATE BOUNDARY

The results of the 1993 GPS campaign in the Central and South America (CASA) project are presented. 21 stations have been observed along the Bocono-El Pilar fault system in Venezuela. By simultaneously occupyin g a fiducial site at Richmond/Florida the regional Venezuelan network is related to the International Terrestrial Reference Frame (ITRF). Se veral alternatives in the evaluation procedure are discussed. The accu racy of the final solution is about +/-5 mm in latitudinal and in long itudinal position components, and +/- 10 mm in vertical direction. A c omparison with the 1988 survey of five identical stations shows coordi nate shifts of stations on both sides of the Bocono fault in rough acc ordance with predictions of the Caribbean and South American plate mot ions.