Monitoring Vertical Deformations of the Coastal City of Palu After Earthquake 2018 Using Parallel-SBAS

Surface deformation is a phenomenon that can occur both naturally and by human intervention. Remote sensing known can be used to obtain information regarding surface deformation. Various methods have been developed, such as DInSAR, TS-NSAR, SBAS, and PSBAS. The PSBAS method is on the geohazard exploration platform issued by Terradue. This research aims to determine whether the PSBAS method can see the condition of surface deformation after the hammer earthquake in Central Sulawesi in 2018 using a data range from 2019-2021. Research results show that several points after the hammer earthquake experienced subsidence and uplift. The highest subsidence is -3.893 cm, and the highest uplift is 3.935 cm. The accuracy check results show that areas experiencing subsidence correlate with urban areas related to groundwater extraction. In contrast, uplift areas correlate with the uplift location being at the collision zone of the Palu-koro fault facing the Makassar fault. The result proves that PSBAS in Geohazard Exploration Platform cloud computing-based could get information about surface deformation.