1. Department of Earth Sciences, Simón Bolívar University, Caracas 1080A, Venezuela
2. Center for Neotectonic Studies, University of Nevada, Reno, NV 89557, USA
3. Department of Geodesy, Central University of Venezuela, Caracas 1050, Venezuela
4. Sptial Geodetic Research Group, Colombian Geological Survey, Bogota 111321, Colombia
5. Department of Geological Sciences, Central Washington University, Ellensburg, WA 98926, USA