Niğde Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi
Yazarlar: Metin AŞCI, Bülent DOĞAN, Selin YAVUZYILMAZ, Ertan PEKŞEN, Ahmet KARAKAŞ, Fadime SERTÇELİK, İbrahim SERTÇELİK, Cengiz KURTULUŞ
Konular:Mühendislik
DOI:10.28948/ngumuh.502430
Anahtar Kelimeler:North Anatolian Fault System,Resistivity,Magnetic,Transtensional stress,Negative flower structure
Özet: It has been determined that the majority of the faults located in the shallow and deep depths of the continental crust are dipped to the north by modeling the gravity data obtained from the same measurement locations with a total of 19 multi-electrode resistivity (ERT) and 16 magnetic profiles on the northern branch and faults in the south of the northern branch of the North Anatolian Fault System (NAFS) in the Marmara Region. These profiles are vertically obtained in the locations where morphotectonic and tectonostratigraphic faults exist on the surface in different lengths and consist of 7300 m magnetic and 6270 m resistivity measurements in total. The magnetic dyke method revealed that the deeper faults of the continental crust are northward dipped with high-angle and, and that the right lateral strike-slip fault, only main fault type, is previlent in the Plio-Quaternary deposits. The dip angles of the fault planes observed in the south vary from 45° to 60° at different depths between the Izmit bay and the Sapanca lake. These faults are not continuous in the east and west directions but are segmented. NAFS northern branch is the only major structural element that accompanies to the sedimentation of deposits in the Pliocene-Holocene (Upper Neotectonic period) deposits. When the fault planes (geophysical fault) determined by resistivity and magnetic methods up to 1300 m depth of the continental crust in the region were evaluated together with the fault traces (geological fault) on the surface, it was determined that the faults in the south forming the depression areas showed a zonation from the south to the north in the study area. Fault planes located in the south of the primary branch of the North Anatolian fault system support that the faults that have dipped towards the depression areas can be connected to the main tectonic source, North Anatolian fault system in the deeper parts of the crust, and that the deformation in the region is in the form of a negative flower structure.