Paleoseismological features of faults Acigöl (Denizli-Afyon) graben

The northern and southern marginal faults of Acıgöl graben basin in the east of the Aegean graben system were studied for palaeoseismological purposes and important findings were obtained regarding the activity of the faults in the Quaternary period. The Maymundağı fault, which forms the northern boundary of Acıgöl graben basin, was analysed as two separate segments in the east and west, and it was observed that the Dazkırı segment in the east moved at least 10000 years ago, and in the later periods, the movement was concentrated on the Bozkurt segment in the west. It can be said that an earthquake occurred in the east of the Bozkurt segment 6720 years ago and then the activity migrated towards the west of the segment and produced earthquakes 2370, 1322 and 598 years ago, respectively. In the west of the segment, the average earthquake recurrence period is 724 years and the slip rate is 0.58 mm/year. The calendar year of the future earthquake in this zone can be predicted as 2150. The Gemiş fault, which forms the southern boundary of the Acıgöl graben basin, is divided into 5 separate segments, which are classified as the Northeast-Southwest oriented Akpınar segment and Gölcük segment, the East-West oriented Çaltı and Beylerli segments, and the Northwest-Southeast oriented İnceler segment. The approximately east-west orientated segments of the Gemiş fault may have produced earthquakes that may have produced three separate surface fractures in 1773 in the east and 1500 and 1000-1100 years ago in the west. Especially in the earthquakes that are thought to have occurred 1500 and 1000-1100 years ago, there is a total throw of about 2.5 m on the main fault and it is thought that it may have produced an earthquake with a magnitude of M = 6.9 and a surface fracture of 23 km in length.