Abstract
Abstract. Global Positioning System (GPS) technique has been extensively implemented in determination of crustal deformation globally. With the ability of providing solution up to milimeter (mm) level, this technique has proven to provide a precise estimate of site velocity that represents the actual motion of tectonic plate over a period. Therefore, this study aims to evaluate the site velocity estimation from GPS-derived daily position of station, respective to the global plate motion model and predicted site velocity via Least-Squares Collocation (LSC) method within the tectonically active region of Sundaland. The findings have indicated that stations with precise velocity estimates were consistent with global plate model and predicted velocity, with velocity residuals of 5 mm – 10 mm. However, stations that were severely impacted by continuous earthquake events such as in Sumatra were believed to be induced by the impact with consistently large velocity residuals up to 37 mm. Following the outcomes, this study has provided an insight on the post-seismic decay period plate motion which are induced by continuous tectonic activities respective to modelled plate motion.
Highlights
Global Positioning System (GPS) technique has frequently implemented in determination of geophysical events such as plate motion (Duman and Sanli, 2019)
Series of GPS observations combined with multiple geodetic techniques have contributed to support the global plate motion model which are based on geophysical and geological data (Bastos et al, 2010) vice-versa whereby plate tectonic models can be biased by local effects and show inconsistencies while GPS observations depict motions over a short time interval, representing the present-day plate motion
This section comprises of four parts: (1) GPS-derived site velocities of MyRTKnet and SuGAr sites, (2) Predicted velocities from plate motion model; NNR-MORVEL56 and NUVEL-1A. (3) Predicted velocities by Least-Squares Collocation method and (4) Analysis on the performance of the site velocity prediction
Summary
Global Positioning System (GPS) technique has frequently implemented in determination of geophysical events such as plate motion (Duman and Sanli, 2019). Series of GPS observations combined with multiple geodetic techniques have contributed to support the global plate motion model which are based on geophysical and geological data (Bastos et al, 2010) vice-versa whereby plate tectonic models can be biased by local effects and show inconsistencies while GPS observations depict motions over a short time interval, representing the present-day plate motion. This study intends to examine the efficiency of GPSderived velocity, respective to the predicted velocities via global plate motion models. Within the tectonically active region such as Sundaland, observed velocity from GPS could differ from the predicted velocity by model as it is biased by local effects. The findings will give an insight towards the present-day plate motion respective to the modelled plate motion
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