Brazilian vertical datum monitoring - Vertical land movements and sea level variations

Abstract

UFPR's Geodetic Instrumentation Laboratory carried out several geodetic campaigns at Brazilian Vertical Datum during the last nine years. The last campaign performed in the first semester of 2005 had as main goals: calibration of two sea level sensors of the tide gauge station; periodic GPS observations at one SIRGAS station, used to materialize the tide gauge geocentric position; and leveling of the benchmarks in the harbor area. In this work there are presented results obtained with this campaign and some comparisons to past campaigns. The main objective is to check the stability of the GPS station in order to estimate vertical land movements and sea level variations. GPS results indicate a tendency of subsidence of 0.2mm/a with a standard deviation of 0.1mm/a at the station. © Springer-Verlag Berlin Heidelberg 2007.