VELOCIDADES DE LAS ESTACIONES SIRGAS2000 SOBRE LAS PLACAS DEL CARIBE Y SURAMERICANA APLICANDO LOS MODELOS DE LA UNAVCO Y VEMOS2009
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Universidad Industrial de Santander
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En este trabajo se determinan las velocidades de un conjunto de estaciones SIRGAS2000 que se encuentran en las placas Caribe y Suramericana, partiendo de las diversas soluciones ofrecidas por los cálculos y modelos VEMOS2009 y UNAVCO. Los vectores de velocidad obtenidos a partir de estos modelos permiten la transformación de coordenadas de las estaciones de las redes nacionales y continentales que servirán de apoyo a nuevas estaciones, luego de ajustar el conjunto de observaciones provenientes del Global Navigation Satellite System (GNSS) en el Marco Internacional de Referencia Terrestre (ITRF) en el que son finalmente expresadas. Las velocidades medias de las estaciones sobre la placa del Caribe SIRGAS2000 en MORVEL2010 son 19,08 + / - 1,09 mm / año con azimut promedio 87,93 y desviación + / - 8,15 grados en la placa del Caribe con movimiento rotacional sobre la placa de Suramericana en condición de fija. Los componentes resultantes son 18,89 + / - 1,12 mm / año en Este y 0,70 + / - 2,68 mm / año en Norte. En el lapso de diez (10) años estas variaciones significan unos 0,217 metros, que al no considerarse afectarían la densificación en redes de alto nivel. Los resultados obtenidos mediante la aplicación de los modelos implementados en UNAVCO y VEMOS2009 y particularmente sus diferencias respecto a MORVEL2010 son determinantes en la densificación de Estaciones-CON (activas) SIRGAS, principalmente en Venezuela y Colombia con redes materializadas sobre placas distintas. Los rangos de las desviaciones en las componentes de la velocidad y sus acimutes corresponden a efectos propios de la téctónica imperante en la zona, de allí que se justifica que estos países cuenten con un adecuado programa oficial de fortalecimiento de sus redes geodésicas.
This work is aimed at determining velocities of a set of SIRGAS2000 stations located in the Caribbean and South American plates, based on the different solutions provided by UNAVCO and VEMOS2009 models and calculations. Velocity vectors obtained from these models are used to transform the coordinates of the national and continental network stations, which will support new stations, once the observations from the Global Navigation Satellite System (GNSS) are adjusted and transformed through the International Terrestrial Reference Framework (ITRF) in which they are ultimately expressed. Mean velocities of the SIRGAS2000 stations on the Caribbean plate in MORVEL2010 are 19.08 + / - 1.09 mm/year with an average azimuth of 87.93 and deviation + / - 8.15 degrees on the Caribbean plate, with rotational motion on the South American plate. The resulting components are 18.89 + / - 1.12 mm/year East and 0.70 + / - 2.68 mm year North. Over a ten-year period, these variations mean about 0.217 meters, which, unless considered, would impact large-scale cartographic production. Deviation ranges in velocity components and their azimuths maycorrespond to effects typical of the tectonics prevailing in the region; therefore, it is justified for these countries to have a suitable official program to strengthen their geodesy networks.
This work is aimed at determining velocities of a set of SIRGAS2000 stations located in the Caribbean and South American plates, based on the different solutions provided by UNAVCO and VEMOS2009 models and calculations. Velocity vectors obtained from these models are used to transform the coordinates of the national and continental network stations, which will support new stations, once the observations from the Global Navigation Satellite System (GNSS) are adjusted and transformed through the International Terrestrial Reference Framework (ITRF) in which they are ultimately expressed. Mean velocities of the SIRGAS2000 stations on the Caribbean plate in MORVEL2010 are 19.08 + / - 1.09 mm/year with an average azimuth of 87.93 and deviation + / - 8.15 degrees on the Caribbean plate, with rotational motion on the South American plate. The resulting components are 18.89 + / - 1.12 mm/year East and 0.70 + / - 2.68 mm year North. Over a ten-year period, these variations mean about 0.217 meters, which, unless considered, would impact large-scale cartographic production. Deviation ranges in velocity components and their azimuths maycorrespond to effects typical of the tectonics prevailing in the region; therefore, it is justified for these countries to have a suitable official program to strengthen their geodesy networks.
Keywords
Caribbean plate, South American plate, plate models, UNAVCO, VEMOS2009, MORVEL2010, ITRF, GNSS, Placa del Caribe, Placa Suramericana, Modelos de placas, UNAVCO, VEMOS2009, MORVEL2010., ITRF, GNSS