Determination of Slip-Rate by Optical Dating of Lake Bed Sediments from the Dasht-E-Bayaz Fault, Ne Iran
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Institute of Geophysics, Tehran University, Kargar Shomali, Tehran, Iran
The School of Geography, University of Oxford, south park road, Oxford OX1 3QY, UK
Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3AN, UK
Department of geology, Birjand University, P.o.Box 131, Birjand, Iran
Geological Survey of Iran, Azadi Square, Meraj Avenue, P.O. Box 11365-4563, Tehran, Iran
Submission date: 2014-09-27
Acceptance date: 2015-04-09
Online publication date: 2015-10-15
Geochronometria 2015;42(1):148-157
The Dasht-e-Bayaz left-lateral strike-slip fault in northeastern Iran ruptured in two destructive earthquakes in 1968 and 1979. The western half of the Dasht-e-Bayaz fault cuts across the dry lake-bed in the Nimbluk valley and has no measurable relief except for at a few localised jogs in the fault trace. We provide the first quantitative constraint on the slip-rate of the Dasht-e-Bayaz fault averaged over the Holocene. The western part of the fault cuts across the Nimbluk valley; the flat surface of which is composed of lake-bed sediments. Small streams cut into the surface of the lake-beds are displaced across the fault by 26 ± 2 m. Two OSL samples of the lake-bed sediments are success-fully dated at 8.6 ± 0.6 and 8.5 ± 1.0 ka, from which we calculate a minimum slip-rate of 2.6 mm/yr. This minimum slip rate remains constant with the previously proposed Holocene slip rate of 2.5 mm/yr and within the range of the Holocene slip rate of 2.4 ± 0.3 mm/yr estimated before on the central section of the Doruneh fault.
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