Structural Characteristics, Paleoseismology and Slip Rate of the Qoshadagh Fault, Northwest of Iran
- Authors: Faridi M.1,2, Nazari H.1, Burg J.3, Haghipour N.3, Talebian M.1, Ghorashi M.1, Shokri M.A.2, Ahmadzadeh E.1, Sahebari S.S.4
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Affiliations:
- Research Institute for Earth Sciences
- Geological Survey of Iran
- Department of Earth Sciences—Ion Beam Physics
- Roshdiyeh High Education Center
- Issue: Vol 53, No 2 (2019)
- Pages: 280-297
- Section: Article
- URL: https://journals.rcsi.science/0016-8521/article/view/156797
- DOI: https://doi.org/10.1134/S0016852119020031
- ID: 156797
Cite item
Abstract
Geometric and seismic parameters of the Qoshadagh Fault (QDF) were investigated to evaluate seismic hazard along this fault, which consists of three segments. The central E–W striking, dextral-reverse segment is the longest and terminates at both ends into NW–SE striking splay arrays. Both eastern and western splay arrays form locally transtensional bends. Paleoseismic data obtained from three excavated trenches across the fault combined with dated offset geomorphic features revealed that the central segment experienced at least 5 surface rupturing earthquakes during the past 2.5 ka, with maximum moment magnitude of Mw = 6.8 ± 0.2. The mean recurrence interval for the identified paleoearthquakes is 452 ± 143 years (±2σ) and the calculated amount of slip per event is ca. ≈0.85 m. These results imply that the QDF slips at an average rate of 1.9 ± 0.1 mm yr–1 for over the past 2.5 ka. The obtained values define the seismic behavior of the fault and are essential to remediate ensuing seismic risks.
About the authors
M. Faridi
Research Institute for Earth Sciences; Geological Survey of Iran
Author for correspondence.
Email: mfaridi@gsi.ir
Iran, Islamic Republic of, Tehran, PO Box 13185-1494; Tabriz, PO Box 5167733551
H. Nazari
Research Institute for Earth Sciences
Email: mfaridi@gsi.ir
Iran, Islamic Republic of, Tehran, PO Box 13185-1494
J.-P. Burg
Department of Earth Sciences—Ion Beam Physics
Email: mfaridi@gsi.ir
Switzerland, Zürich, 8093
N. Haghipour
Department of Earth Sciences—Ion Beam Physics
Email: mfaridi@gsi.ir
Switzerland, Zürich, 8093
M. Talebian
Research Institute for Earth Sciences
Email: mfaridi@gsi.ir
Iran, Islamic Republic of, Tehran, PO Box 13185-1494
M. Ghorashi
Research Institute for Earth Sciences
Email: mfaridi@gsi.ir
Iran, Islamic Republic of, Tehran, PO Box 13185-1494
M. A. Shokri
Geological Survey of Iran
Email: mfaridi@gsi.ir
Iran, Islamic Republic of, Rasht, PO Box 4188957981
E. Ahmadzadeh
Research Institute for Earth Sciences
Email: mfaridi@gsi.ir
Iran, Islamic Republic of, Tehran, PO Box 13185-1494
S. S. Sahebari
Roshdiyeh High Education Center
Email: mfaridi@gsi.ir
Iran, Islamic Republic of, Tabriz, PO Box 5158464918
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