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Tectonics movements of Kuhbanan fault system in Bahabad region, Central Iran

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Author(s): A. Shafiei Bafti

Journal: Iranian Journal of Earth Sciences
ISSN 2008-8779

Volume: 3;
Issue: 2;
Start page: 92;
Date: 2011;
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Keywords: Active tectonics | Geomorphic indices | Drainage reconstruction | Cumulative displacement | slip rate | Kuhbanan faul systemt

ABSTRACT
Kuhbanan fault system, as one of the intracontinental faults of central Iran, is recognized by considerable seismogenic activities and modern morphotectonics evidences with a strike-slip (reverse component) motion. According to the geometric and kinematics data, Kuhbanan fault has been divided into 5 segments (S26, S27, S28, S29, S30) in Bahabad region. Measured geomorphic indices of ratio of valley-floor width to valley height (Vf) and morphology of the valley (V) manifest the maximum denudation rate for the S28 segment. The mean calculated values of mountain-front sinuosity (Smf) and %facet parameters for different segments of the fault are 1.1 and 83.16, consequently. Regarding to these geomorphic indices, a denudation rate of about 2-4 mmyr-1 is suggested for this region. According to reconstruction of Kuhbanan fault since 360 ka, minimum horizontal cumulative displacement of 750 m and minimum slip rate of about 2-1.4±0.1 mmyr-1 is inferred from well preserved geomorphology in the northern segment of the fault. Applying this horizontal cumulative displacement causes reconstruction of geomorphic markers such as drainages and shuttered ridges.
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