Crustal Deformation in Peninsular Malaysia in Year 2020
DOI:
https://doi.org/10.15282/construction.v5i1.11419Keywords:
Sunda land, Earth Centered Earth Fixed, Coordinate Time Series, Plate Motion, Euler PoleAbstract
Peninsular Malaysia is situated on Sunda Plate, that moves 2-3 cm/year, causing coordinate change in national datum. Maintenance of the national datum is necessary by considering the crustal deformation rate of Sunda plate, also known as site velocity. The site velocity can be quantified by using space-based technique which can be facilitated by Global Positioning System Continuously Operating Reference Station (GPS CORS) networks. This study aims at investigating crustal deformation in Peninsular Malaysia. The objectives include generating precise geodetic baseline vectors between Malaysian Real Time Kinematic GPS Network (MyRTKnet) and International GNSS Service (IGS) stations, providing trend of crustal deformation via International Terrestrial Reference Frame (ITRF) coordinate time series at MyRTKnet station and analysing the magnitude and direction of tectonic plate movement in Peninsular Malaysia. Raw GPS and ephemerides data at MyRTKnet and IGS stations has been utilized to generate the baseline vectors using Bernese GNSS Software 5.2. The precision of coordinate time series has been achieved at 1.393cm. Network adjustment has been performed by using these baseline vector network to generate high precision coordinate time series in ITRF. The changes of coordinate in horizontal and vertical components have been estimated based on site velocity with precision 0.5172cm. From the site velocity, each station moved to south-eastward at 1-2cm/year according to the 6 months processing. This study also attempted to calculate Sunda plate rotation from the estimated site velocities. The angular momentum of Sunda plate rotation was found at 45°26’06” N, 125°32’56” E with rotation at ± 355.3586°. The output of the study can be used as time dependency model for maintaining national datum of Malaysia.
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