Identifikasi Deformasi Permukaan Gempa Bumi Turki 24 Januari 2020 dengan Teknik Interferometric Synthetic Aperture Radar (INSAR)

Since the earthquake causes deformation in broadscale area, identification of surface deformations due to an earthquake cannot be carried out conventionally using terrestrial surveys. Alternatively, satellite-based observation offers efficient way to map the surface deformation due to an earthquake. The deformation map then can be used as a tool for post-disaster assessment as part of disaster management systems. Here, the 24 January 2020 Turkey earthquake was investigated using Differential Interferometric Synthetic Aperture Radar (InSAR). A pair of InSAR data was formed using two Sentinel-1 Single Look Complex (SLC) images. The surface deformation then was mapped using converted interferograms through filtering, phase unwrapping and geocoding processes. GMTSAR, an open-source UNIX-based code, was used to process all image data. The results showed that surface deformation due to the 2020 Turkey earthquake is well-mapped by InSAR images. In this case, the most heavily affected area due to this earthquake is easily identified. Coseismic deformation signal is clearly imaged up to a radius of ~20 km from the earthquake epicenter. The result shows an uplift pattern in the vicinity of the epicenter area. The Line of Sight (LOS) displacement are observed from -182.9 mm (subsidence) to 340.3 mm (uplift)