General Geometric Model of GNSS Position Time Series for Crustal Deformation Studies – A Case Study of CORS Stations in Vietnam

Abstract

In processing of position time s eries of crustal deformation monitoring stations by continuous GNSS station, it is very important to determine the motion model to accurately determine the displacement velocity and other movements in the time series. This paper proposes (1) the general geometric model for analyzing GNSS position time series, including common phenomena such as linear trend, seasonal term, jumps, and post-seismic d eformation; and (2) the approach for directly estimating time decay of postseismic d eformations from GNSS position time series , which normal ly is determined based on seismic models or the physical process seismicity, etc . This model and approach are tested by synthetic position time series , of which the calculation results show that the estimated paramete rs are equal to the given parameters. In addition they were also used to process the real data which is GNSS position time series of 4 CORS stations in Vietnam, then the estimated velocity of these stations: DANA (n, e, u = - 9.5, 31.5, 1.5 mm/year ), HCMC ( n, e, u = - 9.5, 26.2, 1.9 mm/year ), NADI (n, e, u = - 10.6, 31.5, - 13.4 mm/year ), and NAVI (n, e, u = - 13.9, 32.8, - 1.1 mm/year ) is similar to previous studies.