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

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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 segmentsrupture together, the Dodurga Fault could potentially generate an earthquake of Mw 7.16.

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