In total, 380 km of marine magnetic data were processed and interpreted to reveal the main tectonic elements that control the formation of the lake. Lake İznik, which is an approximately rectangular-shaped active tectonic basin with 32 km length and 12 km width, is located between two segments of the North Anatolian Fault in the northeast Marmara region, Turkey. The purpose of this study is to identify the tectonic elements that played a role in the formation of Lake İznik with the help of new magnetic data and to reveal the tectonic evolution of the region by using other previously collected geophysical data. The Euler deconvolution, tilt angle, analytic signal and source edge detection methods were applied to the total field magnetic data for Lake İznik and its surroundings to determine the boundaries and depths to the source of magnetism. From the structural map obtained as a result of the review of this data, linearity in the magnetic data was detected along the NW–SE direction in the north of Lake İznik, N–S direction in the west and east, and E–W direction in the south. These lineaments were correlated with a limited amount of seismic data obtained from previous studies and were associated with faults. This linearity in NW–SE direction in the north was evaluated as the continuation of the Orhangazi fault and it is thought to play a significant role in the tectonic evolution of Lake İznik. When the results obtained from this study and the paleomagnetic results for the Eocene volcanic rocks in the study area are evaluated together, Lake İznik was connected with Gemlik Bay and the Marmara Sea during the Eocene–Pleistocene and Orhangazi Fault disconnected Lake İznik from Gemlik Bay in the Pleistocene–Holocene. It was deduced that the lake basin is a pull-apart basin developed up to the present day.

总共处理和解释了 380 公里的海洋磁数据，以揭示控制湖泊形成的主要构造要素。伊兹尼克湖是一个近似矩形的活动构造盆地，长 32 公里，宽 12 公里，位于土耳其东北部马尔马拉地区的北安纳托利亚断层的两段之间。本研究的目的是借助新的磁学数据确定在伊兹尼克湖形成过程中发挥作用的构造元素，并利用先前收集的其他地球物理数据揭示该地区的构造演化。将欧拉解卷积、倾斜角、解析信号和源边缘检测方法应用于伊兹尼克湖及其周围的全场磁数据，以确定磁源的边界和深度。根据对该数据进行审查而获得的结构图，在伊兹尼克湖以北的 NW-SE 方向、西部和东部的 N-S 方向以及 E-W 方向检测到磁数据的线性在南方。这些线条与先前研究中获得的有限数量的地震数据相关，并且与断层有关。北部 NW-SE 方向的这种线性被评估为 Orhangazi 断层的延续，并被认为在伊兹尼克湖的构造演化中起着重要作用。将本次研究结果与研究区始新世火山岩古地磁结果综合评价时，伊兹尼克湖在始新世-更新世期间与盖姆利克湾和马尔马拉海相连，而奥尔汉加齐断层在更新世-全新世将伊兹尼克湖与盖姆利克湾断开。推断该湖盆是发展至今的拉分盆地。