Güneydoğu Marmara Şelfinin Sismo-akustik Yapısı

Since Turkey is located in one of the most active earthquake zones inthe world, there is an earthquake risk in almost the whole country.Considering the studies carried out by many researchers, the historicalearthquakes in the region and especially the 17 August 1999earthquake that caused great destruction, it is understood that theearthquake potential of the Marmara Region is quite high. It is knownthat the North Anatolian Fault (NAF), which continues along thenorthern line of Anatolia, is one of the most seismically active faultsin the world, and this fault is divided into many small fault brancheswith three main branches in the Sea of Marmara. These main branchesare named as the Northern Branch, the Central Branch and theSouthern Branch. Therefore, in the Sea of Marmara, many differentfault types are seen together with the effect of different branches aswell as lateral faults. Previous studies have revealed that manyearthquakes have occurred in the Sea of Marmara are concentrated onthe northern branch of the NAF, and also showed that the earthquakesoccurring on this branch are more than the other branches. However,as the studies on the central branch on the Southern Marmara shelf arelimited, there is no detailed information in the literature about theregion. Since this fault system, which has a very complex structure inthe Marmara Sea, has many effects in the south, it is necessary toevaluate possible large-scale earthquakes that could be caused bymany faults belonging to the NAF.Within the scope of the study, the region between the KapıdağPeninsula and the İmralı Island located on the southern shelf of theMarmara Sea, is being studied tectonically. Throughout the study,multi-channel seismic reflection and sparker seismic reflectiondatasets collected within the scope of the TUBİTAK 112Y026 projectnamed as SOMAR, carried out in 2013 and 2014 to examine thesouthern shelf of the Marmara Sea. In total, approximately 750 km ofmulti-channel seismic reflection, 420 km of sparker seismic reflectionand 450 km of engineering seismic (chirp) datasets were processed andtheir initial interpretations were done.Acoustic data collected within the scope of the study has a penetrationthat we call the middle range, so the faults seen up to this depth aremapped as active and inactive faults. In addition, since the acousticbasement is at a depth that the data can penetrate in the southern partof the study area, the basement in this region has been interpreted indetail and the faults traced to the basement have been revealed. Thelevels above the acoustic basement will be interpreted stratigraphicallyduring the study and horizon maps will be created.</p