Post-seismic kinematic analysis of faults in and around İzmir following the 30 october samos (Mw 6.9) earthquake using geodetic methods

Within the scope of this thesis, eight campaign-based postseismic GNSS measurements were carried out at 27 GNSS sites in the region affected by the 30 October 2020 Samos Earthquake (Mw 6.9). The campaigns began with the coseismic measurements conducted in November 2020 and were completed in April 2025. All data were processed using the GAMIT/GLOBK software package. Using all campaign datasets, postseismic velocities in the Eurasia-fixed ITRF2014 frame were estimated based on various campaign combinations. Analysis of these combinations showed that, for most GNSS stations, the first two campaigns captured early postseismic deformation. Differences between the postseismic velocities from the optimal combinations and the preseismic velocities were then computed, and their statistical significance was tested using a t-distribution at α = 0.05. The results indicate that stations near the epicenter (DMRC, OZDE, and ZEYT) continue to exhibit postseismic deformation. Furthermore, at stations KBR3, KBR4, and KBR5, increased velocity differences between the preseismic and postseismic periods suggest that their Eurasia-fixed velocities have begun to decelerate.