Analyzing Bornova Plain's Basin Structure Using Density Parameter

Due to the tectonic regime it has been subjected to under the influence of Western Anatolia, the area contains numerous sedimentary basin structures. The study area, located within the province of Izmir, is a region where a significant number of historical and instrumental earthquakes have occurred due to its tectonic structure. The Bornova Plain, located east of the inner Gulf of Izmir, is highly susceptible to earthquakes due to dense urbanization. This was clearly observed during the Samos earthquake on October 30, 2020. In this study, a microgravity field survey was conducted in a larger area than previous studies to better characterize the basin effect of the plain and obtain a high-resolution dataset representing a wide area. The necessary measurement point distribution was performed with a variable sampling interval of approximately 200-1000 meters, resulting in a microgravity dataset of 458 points. By taking 1 profile section from the residual Bouguer gravity map created for the Bornova Plain, inverse solution modeling was performed. The density values obtained from the inverse solution modeling were compared with the densities calculated from seismic velocities obtained through the spatial autocorrelation (SPAC) method conducted in the study area. A high consistency was observed between the density values obtained from the two different methods compared.