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Formation of the grabens in southwestern Anatolia.

Abstract:

Tectonic compression and tensional directions at the Miocene-Quaternary interval are determined on the basis of results obtained from the evaluation of faults in SW Anatolian Miocene-Quaternary sediments. Faults evaluation, one of the newest structural evaluation methods, gives more or less the same results with seismotectonic data. Studies carried out on Menderes and Burdur grabens showed a certain mechanism of graben formation in the areas under consideration. And it may thus be suggested that there is a compressive phase followed by a tensional one. Furthermore alternating tension and compression directions are normal to each other. Through regional studies, the following phases are determined: 1) Late Miocene-Early Pliocene compression phase: compression in NW-SE direction, and compression in NE-SW direction. 2) Pliocene graben formation: beginning in Pliocene, the graben formation continued with N-S directed tension through late Pliocene. 3) Old Quaternary compression phase: N-S directed compression in Burdur and WNW-ESE directed compression in Saraykoy (Denizli) areas. 4) Young Quaternary graben formation: NE-SW directed tension in Menderes Graben and NW-SW directed tension in Burdur.-Authors