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The 23 October 2011 Van Earthquake (Mw: 7.2) was generated by the Van Fault Zone (VFZ) with reverse fault characteristics. The earthquake on the fault caused surface deformation with 10 cm displacement observed in engineering structures. On land the VFZ has general E-W strike and 28 km length. The western end of the fault is within Lake Van. This study aimed to determine the tectonic structure and evolution in the Quaternary of Edremit Bay using detailed mapping of the VFZ with land and underwater research methods, investigation of its continuation into Lake Van and common assessment of land and underwater data. Continental data showed the presence of E-W fold axes affecting Quaternary units in the hanging-wall and footwall of the VFZ. Offshore studies using shallow seismic profiling (GeoAcoustics) and multibeam bathymetric data acquisition determined that the underwater section of the VFZ had similar characteristics to those on land. Quaternary successions on the lake floor observed on seismic sections clearly showed folds in both blocks of the fault with axes parallel to the strike of the fault. The underwater ridge that is an extension of Carpanak Cape coincides with the ridge structure on the hanging-wall block of the fault on land. Surface deformation related to the 23 October 2011 earthquake developed in a broad zone of the hanging wall of the VFZ. The research findings show the deformation along the VFZ in the Quaternary is in accordance with the deformations developing during the last earthquake

TECTONIC DEFORMATIONS IN THE QUATERNARY DEPOSITS OF THE LAKE VAN (EDREMİT BAY), EASTERN ANATOLIA, TURKEY