Preliminary results of paleoseismic investigations on the Doruneh fault in Central Iran (northeast of Jandaq): Evidences for horizontal and vertical displacements in Holocene

The Doruneh fault with a length of ۶۰۰-۹۰۰ km, is among the longest strike-slip faults in Iran. Several studies have concentrated on determining the slip rate of several parts of this fault which is resulted to different values between ۰.۵ to ۵.۳ mm/yr. Based on these studies different opinions about the change of slip rate trough time have been suggested. However, some parts or segments of this long active fault have not yet been studied. Following two weeks of field work and with the help of satellite images, we discovered evidences of horizontal and vertical Holocene displacements in the northeast of Jandaq (central Iran) on the fault. We measured the displacement in beheaded streams along the fault and collected sediment samples from the displaced units to calculate the slip rate using the OSL dating method.