Niğde Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

Yazarlar: Ali KAYA

Konular:Mühendislik

DOI:10.28948/ngumuh.502284

Anahtar Kelimeler:Active tectonics,Paleoseismology,Çardak,Acıgöl graben,Western Turkey

Özet: The study area is located at nearly east of the Denizli Province which is called Acıgöl graben basin. The basin is about 40-50 km in length and 11-21 km in width. The investigated faults are positioned at the northern side of the basin. This part of the basin consists of coarse grained, thick layered units ranging from Oligocene to Quaternary. A large number of historical earthquakes have not been reported. The largest earthquake recorded in the basin is Ms=4.7 and Ms=4.5 at 15/11/1960 and 25/06/1964, respectively. According to instrumental period seismological data, the concentration of small- to medium-scale earthquake epicenters on this fault suggests that the Maymundagi fault is seismically active today. Resistivity studies were carried out on active faults in the study area. Paleoseismological trenches were excavated in order to confirm the existence of the faults detected by geophysical studies. In this paper, the assessment results of a paleoseismologic the trench II study are presented, which cuts the active fault from the two trenches. The trench size was 25 m (length), 1.5 m (width) and 4-5 m (depth). A number of minor faults, parallel to the main Maymundagi fault, have been observed inside the trench. They are mainly oblique and normal with a few strike-slip faults. The position of the active fault was 190/45 and sand-gravel-soil accumulations were observed on it. The active faults have deformed these recent (Holocene) alluvium sediments. In order to understand the seismic activity of this fault, samples were taken from the Holocene sediments in the trench for aging by the Optically Stimulated Luminescence (OSL) method.

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