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28 March 1970 Gediz earthquake fault, western Turkey: palaeoseismology and tectonic significance

On 28 March 1970, an unexpected and destructive earthquake (Ms = 7.2) originated along the Erdoğmuş fault (EF), which forms the southern margin of the modern Erdoğmuş–Yenigediz graben in the central part of the Akşehir–Simav fault system. The EF is a N-dipping normal fault, ∼12 km long, generally E–W-trending, and characterized by a minor right-lateral strike–slip component. To determine its past activity, a palaeoseismological exploratory trenching study was conducted. Two trenches (EFT-1 and EFT-2) were excavated on the ground surface rupture of the 1970 Gediz earthquake near Erdoğmuş village. Based on the relative displacement between units observed and mapped in EFT-1, at least three events were identified. Two events were also identified in EFT-2. Only one of the events in EFT-1 can be dated via 14C. The estimated recurrence interval on the EF is ∼910 ± 40 years.