Current motion of Peninsular Malaysia using high precision GNSS / Nurhanani Abd Mutalib

Peninsular Malaysia is located relatively distant from Sumatra's seismic source zone, the closest earthquake location to Malaysia is around 350 kilometres away. Sumatran earthquakes have caused vibrations on multiple occasions. Peninsular Malaysia has been hit by major earthquakes from West Sumatra on occasions. The displacement of MyRTKnet stations owing to co-seismic motion from the 2004 Sumatra earthquake ranged from 1.5 to 17.0 cm, with the majority of displacement happening in the south-west direction. Similarly, the data multiple from the 2005 and 2007 earthquakes shows displacements of 1.0 to 6.5 cm and 1.0 to 3.0 cm in the south-west direction, respectively. Meanwhile, the earthquakes of 2012 produced displacements in the north-east direction ranging from 0.3 to 4.8 cm. The study area covers the entire of Peninsular Malaysia. GNSS precise point positioning (PPP) is a useful tool for obtaining more accurate estimates of point displacement up to millimetres. MyRTKNet data were processed via high GPS Processing Software known as GIPSY. The estimation of Peninsular MyRTKNet station’s velocities was obtained following the plotted of time series. This study analysed the coordinates time series to predict the strain rate estimation. From the estimated strain rate, Peninsular Malaysia’s motion were interpreted. The directions of the station’s magnitude were towards South East region. Station magnitudes range from 18.8 to 30.23 mm/yr. Peninsular Malaysia was undergoing a variety of deformations from north to south. The findings in this study helps to detect the motion occur at MyRTKNet station in Peninsular Malaysia due to the impact of the earthquakes that occur in Sumatra Subduction Zone and surrounding. Besides, the deformation analysis helps the authority in forming a solution and plan a mitigation to this matter.