Monday 22 August 2005

G4

PM0032
Deformations control for the Chilean part of SIRGAS 2000 Frame
Baez, Juan Carlos¹,2, Dalazoana, Regiano¹, Luz, Roberto¹,3, De Freitas, Silvio Rogerio Correia¹
1 Universidade Federal Do Parana, Curso De Pós-Graduação Em Ciências Geodésicas, Brazil
2 Universidad De Concepción, Departamento De Geomensura, Brazil
3 Instituto Brasileiro De Geografia E Estatística, Brazil
Author email: sfreitas@ufpr.br
With the adoption of the Geodetic Reference System for the Americas (SIRGAS), the observation of temporal variations and deformations in its frame become necessary tasks. These tasks are fundamental in order to maintain the consistency of the frame respect to the definition of SIRGAS, especially in the Chilean deformation area, due to the convergence between the South American and Nazca plates where the variations are larger with respect to the rest of the plate. A four years data span of GPS observations beginning in 2000 is used to estimate the dynamic processes in the area. It was selected 12 International GPS Services (IGS) regional stations. Some of them are also SIRGAS stations. Other 9 permanent stations located in the Chilean Andes were also used. Period of data from 2000 up to 2004 was selected in order to get a better time coverage where all the station has data avail-able. All the stations were processed with Bernese GPS Software 5.0 using IGS products (precise ephemeris and clocks) in daily solutions which were summarized using the normal equations combina-tion techniques. The final results are discussed and compared with Geophysical and Geodetic models.

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