Monitoring Postseismic Deformations in Izmir and Its Surroundings After the 30 October 2020 Mw:6.9 Samos Earthquake

A devastating (Mw: 6.9) earthquake occurred in the north of Samos island on October 30, 2020. This earthquake caused loss of life and property in Izmir city center and some districts. After the earthquake, studies conducted in Izmir and its south showed that there was a horizontal displacement of 4-14 cm in Izmir and its south, the largest of which was in Seferihisar. In this region, there are many active faults with the potential to produce earthquakes between Mw:6.1 and Mw:6.9. A 27-site GNSS network has been established to monitor the postseismic deformation in this region since an earthquake can affect the earthquakes that may be caused by other surrounding faults. 4 GNSS campaign measurements were conducted over 6-month periods between 2020 and 2022 in this network. Eurasian fixed velocities of all sites were obtained using GNSS data. The results obtained show that the differences between both the current velocities and the pre-earthquake velocities in the network have reached 6 mm, and accordingly, the postseismic deformation continues in the region.