Journal of Seismology and Earthquake Engineering

Journal of Seismology and Earthquake Engineering

Slip Rate Determination of Dasht-e Bayaz Fault Using Single Grain OSL Dating of Miam Qanat System in Eastern Iran

Document Type : Seismology and Engineering Seismology

Authors
Morteza Fattahi 1
Morteza Talebian 2
Mohammad M. Khatib 3
Aydin Aghazadeh 1
Hamideh Amini 1
Nina Ataei 1
Robert A. Sloan 4
Vasile Ersek 4
1 University of Tehran, Tehran
2 Geological Survey of Iran, Tehran
3 University of Birjand
4 University of Oxford
10.48303/jsee.2019.240802
Abstract
This article uses, for the first time, the absolute age for a Qanat system, to determine the slip rate of an earthquake fault. In Iran, many of Qanat galleries were dug in the vicinity of, or directly upon, active faults. In some areas such as Dasht-e Bayaz fault, line of craters are displaced by the activity of the fault, which lead to dry Qanat stream, and consequently to dig new shafts by habitants. By means of measuring the offset between new shafts and old shafts, and considering Qanat antiquity, the estimation of fault slip-rate, which is one of the prominent elements in hazard assessment, becomes possible. This study uses absolute age for a Qanat system, obtained through optically stimulated luminescence dating of grains in spoil heaps of Qanat wells. Feldspar single-grain dating of silt sediments that overlie the construction spoil show that the Miam Qanat was maintained until at least 1.6-2.6 ka. Combination of this age and the 10 meter displacement of Qanat line of shafts by Dasht-e Bayaz fault provide a slip rate of 5.2-4.3 mm/yr for this fault.
Keywords
Dasht-e Bayaz
OSL Dating
Slip-rate
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  • Receive Date 23 February 2020
  • Revise Date 19 October 2022
  • Accept Date 26 December 2020
  • Publish Date 01 January 2019