Surface geometry, segmentation and kinematic features of Dodurga Fault, Eskişehir Fault Zone, NW Anatolia

The Dodurga Fault is an active right-lateral strike-slip fault, approximately 63 km long, striking NW–SE in northwestern Anatolia. Based on 1:25,000-scale active fault mapping, the fault is subdivided into two principal geometric segments. Segment 1 is approximately 16 km long and extends from Sulhiye in the west to Erikli in the east, whereas Segment 2 is 47 km long and is characterized by a right-stepping geometry and a 10°–15° southeastern deflection. Geological and geomorphological observations, together with kinematic analyses, indicate that the fault is dominantly right-lateral strike-slip in character. Stream channels offset by up to several kilometers along the fault trace support its long-term activity, and fault-plane kinematic indicators independently confirm dextral motion. Paleostress analyses of the kinematic data indicate that the recent deformation phase along the Dodurga Fault is governed by approximately N–S contraction and E–W extension. Empirical scaling relationships suggest that Segment 1 and Segment 2 are capable of generating earthquakes of Mw 6.47 and Mw 6.97, respectively. If both segments rupture together, the Dodurga Fault could potentially generate an earthquake of Mw 7.16.