The Fault Trace of 1953 Yenice-Gönen Earthquake and the Westernmost Known Extension of the NAF System in the Biga Peninsula

Abstract

Northeast-striking en-echelon faults in the Biga peninsula represent the westernmost known extension of the NAF system. The main faults exhibit a clockwise en-echelon pattern from Manyas-Danişment in the east, Yenice-Gönen in the center and Sarıköy-İnova in the west The NAF system in eastern Turkey developed about 11 my ago and has accumulated a total dextral separation of about 30-40 km. The apparent decrease in displacement to 8 km in the southern segment east of the Marmara Sea corresponds to a change from a single to multiple fault zones. The nature of grabens, as pull-apart basins, during Late Pliocene to Quaternary time in an essentially strike-slip regime has been quantified in the Bursa-Gönen graben apparently moved 3.4 km west-southwest along these faults, while east-west normal faults developed in the graben that account for some 8.2 km of north-to-south extension. No data are available for displacement on the Sarı- köy-İnova and Manyas-Danişment faults.