Crustal Movement Estimation along Opak Fault Based on GNSS Data using Kalman Filtering

Opak Fault is an active fault where located in Special Region of Yogyakarta which need to be monitored because of high seismic potential. GNSS observation along Opak Fault has been deployed periodically since 2013 to 2018 by Department of Geodetic Engineering Universitas Gadjah Mada. This study present displacement rate and crustal movement prediction along Opak Fault using GNSS campaign data. The result show these rates are about 7.81 to 17.52 mm/yr, 0.43 to - 16.52 mm/yr, and 0.43 to -16.52 mm/yr for east, north, and up components respectively. The displacement rate direct to south east side. However, alternative approach of estimation model for crustal movement is need to be evaluated to gain more robust estimation. This study estimate crustal movement along Opak Fault using Kalman Filtering. The estimation accuracy of this filtering is about -0.042 to 2.680 mm of Mean Absolute Error (MAE) and 9.853E-15% to 4.396E-05% of Mean Relative Percentage Error (MRPE).