Advances in Geosciences www.adv-geosci.net 1680-7340 1680-7359 22 4th EGU Alexander von Humboldt Conference "The Andes: Challenge for Geosciences" 2009 10.5194/adgeo-22-181-2009 http://www.adv-geosci.net/22/181/2009/ http://www.adv-geosci.net/22/181/2009/adgeo-22-181-2009.html http://www.adv-geosci.net/22/181/2009/adgeo-22-181-2009.pdf 181 184 2009-12-17 A Terrestrial Reference Frame (TRF), coordinates and velocities for South American stations: contributions to Central Andes geodynamics M. V. Mackern M. L. Mateo lmateo@lab.cricyt.edu.ar A. M. Robin A. V. Calori Consejo Nacional de Investigaciones Científicas y Técnicas, Mendoza, Argentina Facultad de Ingeniería, Universidad Nacional de Cuyo, Mendoza, Argentina Facultad de Ingeniería, Universidad Juan Agustín Maza, Mendoza, Argentina Satellite positioning systems allow the fixing of the location of a point on the Earth's surface with very good precision and accuracy. To do this, however, it is necessary to determine the point coordinates taking account the reference system and the movements that affect them because of tectonic plate movements. These reference systems are materialized by a significant number of continuous measurement stations in South America. In SIRGAS (Sistema de Referencia Geocéntrico para las Américas), there are four Analysis Centers that process the data collected from satellites of the Global Navigation Satellite Systems (GNSS), with the primary purpose to maintain the international terrestrial reference frame through calculation of the coordinates and velocities of the continuous GNSS stations of the SIRGAS-CON Network. <br><br> In this work, we demonstrate the quality of the solutions from CIMA, one of the SIRGAS official processing centers operating in Mendoza, Argentina, in comparison with other South American processing centers. The importance of precise calculations of coordinates and velocities in a global frame is also shown. Finally, we give estimations of velocities from stations located within deformation zones in the Central Andes. % vor jede Referenz Altamimi, Z., Collilieux, X., Legrand, J., Garayt, B., and Boucher, C.: ITRF2005: A new release of the International Terrestrial Reference Frame based on time series of station positions and Earth Orientation Parameters, J. Geophys. Res., 112, B09401, doi:10.1029/2007JB004949, 2007. Angermann, D., Drewes, H., Krügel, M., and Meisel, B.: Advances in terrestrial reference frame computations, Springer, IAG Symposia, Vol 130, 595–602, 2007. Dach, R., Hugentobler, U., Fridez, P., and Meindl, M.: Bernese GPS Software version 5.0, Astronomical Institute, University of Berne, Switzerland, 2007. DeMets, C., Gordon, R., Argus, D. F., and Stein, S.: Effect of recent revisions to the geomagnetic reversal time scale on estimates of current plate motions, Geophys. Res. Lett., 21, 2191–2194, 1994. Drewes, H.: The science rationale of the Global Geodetic Observing System GGOS, in: Dynamic Planet – Monitoring and Understanding a Dynamic Planet with Geodetic and Oceanographic Tools, edited by: Tregoning, P. and Rizos, C., International Association of Geodesy Symposia, Vol 130, Springer Verlag, Berlin, 2006.. Natali, M. P., Müller, M., Fernández, F., and Brunini, C.: CPLat: first operational Experimental Processing Center for SIRGAS in Argentina, J. Geodesy, 83, 219–226, doi:10.1007/s00190-008-0270-5, 2009. Sanchez, L., Seemüller, W., and Krügel, M.: Comparison and combination of the weekly solutions delivered by the SIRGAS Experimental Processing Centres, DGFI Report No 80, Deutsches Geodätisches Forschungsinstitut (DGFI) Alfons-Goppel-Str 11, Munich, Germany, 2008. Sanchez, L. and Brunini, C.: Achievements and Challenges of SIRGAS, in: Geodetic Reference Frames, edited by: Drewes, H., International Association of Geodesy Symposia, 134, 161-166, doi:10.1007/978-3-642-00860-3_25, 2009. Seemüller, W. L.: The Position and Velocity Solution DGF06P01 for SIRGAS, in: Geodetic Reference Frames, edited by: Drewes, H., IAG Symposia, Springer Verlag, Vol 134, 167–172, 2009.