HR: 1400h
AN: G43B-05    [Abstracts]
TI: The Temporal Variation Analysis Of Cananéia GPS Station Coordinates
AU: * de Abreu, M A
EM: mario.abreu@poli.usp.br
AF: University of São Paulo - Polytechnical School of Engineering, Av. Prof. Almeida Prado, Trav. 2, nš. 83, Sala 18, São Paulo, SP 05508-070, Brazil
AU: da Fonseca, E S
EM: edvaldoj@usp.br
AF: University of São Paulo - Polytechnical School of Engineering, Av. Prof. Almeida Prado, Trav. 2, nš. 83, Sala 18, São Paulo, SP 05508-070, Brazil
AB: The objective of this paper is present the results obtained in the data processing of NEIA GPS permanent station, which belongs to the Brazilian Network of Continuous Monitoring of GPS System (RBMC), and to analyze the variations suffered of a time series of the station coordinates. The data had been collected in a double frequency GPS geodesic receiver, with 15 seconds rate of collection. The period analyzed was from January 2002 to April 2006. The data was processed with Bernese V.5.0 software and the AUSPOS on-line service, using differential method. In the Bernese processing was used the fiducial station PARA (Curitiba/Brazil) and for the AUSPOS processing was used BRAZ (Brasília - Brazil), LPGS (La Plata/Argentina) and UNSA (Salta/Argentina), these stations are in the same lithospherical plate. In the both processing's was used a propagation model of planimetric speed to detect NEIA station movement. After the processing's, it were made the difference between the calculated and the fiducial coordinates of NEIA station in the latitude, longitude and geodetic height. The displacement analysis at NEIA station, show variations of its coordinates caused by the South American Plate movement. The Bernese processing results show a displacement around 1,25 cm/year in the North direction and 0,30 cm/year in the West direction. The planimetric resultant vector displacement for NEIA station is about 1,30 cm/year in the Northwest direction. On the other hand, the AUSPOS processing service presented approximately 1,03 cm/year displacement in the North direction for latitude and for longitude an inverse displacements can be verified for the two sessions (first session: 0 to 12 hour and the second session 12 to 24 hour), 0,10 cm/year in West direction and -0,10 cm/year in East direction, respectively. Although, for the geometric height the Bernese and AUSPOS processing results, presents different signals. In the first session the results from Bernese processing present a -0,46 cm/year trend while AUSPOS service present a -0,03 cm/year trend and, for the second session, the Bernese presents -0,64 cm/year trend and the AUSPOS was about 0,03 cm/year trend. A more detailed analysis of the vertical component can be obtained if a comparison of GPS derived geodetic height and the sea level height from tide gauge station. This comparison will be fundamental for the knowledge of the variation of the sea level in the region of study.
DE: 1204 Control surveys
DE: 1207 Transient deformation (6924, 7230, 7240)
DE: 1209 Tectonic deformation (6924)
SC: Geodesy [G]
MN: 2007 Joint Assembly