Architecture of tectonic and crustal structure of the middle marmara sub-basin and its surroundings using gravity data

To study the tectonic and crustal structure of the Middle Marmara Sub-basin and its surroundings, gravity data obtained from the Earth Gravitational Model (EGM08) were analyzed using Radially Averaged Amplitude Spectrum, Total Horizontal Derivative (THD), Parker-Oldenburg (PO) inversion, Normalized Full Gradient (NFG) and Isostatic Analysis techniques. While positive gravity anomalies are observed on the Çınarcık and West Marmara sub-basins on the Marmara Sea Basin, the reason for the negative gravity anomalies observed on the Middle Marmara Sub-basin is one of the objectives of this study. Moreover, the earthquake epicenters are concentrated in the central part of the Main Marmara Fault (MMF) on the Middle Marmara Sub-basin, while sparse in the eastern part of the MMF in the eastern part of the sub-basin. To investigate the causes of these, first of all, the average depth values of the in-sediments, basement, Conrad and Moho discontinuities of the study area were calculated using the radially averaged amplitude spectrum of the Bouguer gravity data. The THD technique was used to display the discontinuity limits at different levels. As a result of the THD calculations, the continuity of the MMF in Middle Marmara Sub-basin could not be observed as a strait fault. It has been interpreted that this fault consists of a series of small faults in this area. Also, the basement topography of the study area was calculated with the inverse solution, hence basement depth varies between 2.8 and 7.4 km. The differences between the Gravimetric Moho and the Isostatic Moho were calculated, and areas with high and low seismic activity were mapped. With this study, it has been concluded that the equilibrium state of the crust has not yet formed around the Middle Marmara Sub-basin and its surroundings. Moreover, the negative gravity anomalies are caused by the collapse of the crust around this sub-basin.Please confirm if the author names are presented accurately and in the correct sequence. Author 1 Given name: [Abdurrahman Yasir] Last name [Parlak]. Also, kindly confirm the details in the metadata are correct.I confirm the author names are presented accurately and in the correct sequence. Author 1 Given name: [Abdurrahman Yasir] Last name [Parlak]. Also, I confirm the details in the metadata are correct.