On the use of displaced river terraces to characterize active tectonics of the Zagros orogenic belt, SW Iran
Investigating fault deformation in Late-Quaternary sediments provide valuable data to seismic hazard analysis especially relevant for the urban areas. Integration of displacement of geomorphic markers and ages of Quaternary sediment is needed to measure deformation rates accurately. In order to prod...
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Elsevier
2024-12-01
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| Series: | Results in Earth Sciences |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211714824000323 |
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| author | Iman Nezamzadeh Ali Faghih Behnam Oveisi Timothy Kusky Narges Khajavi Masoumeh Soleimani Jiannan Meng |
| author_facet | Iman Nezamzadeh Ali Faghih Behnam Oveisi Timothy Kusky Narges Khajavi Masoumeh Soleimani Jiannan Meng |
| author_sort | Iman Nezamzadeh |
| collection | DOAJ |
| description | Investigating fault deformation in Late-Quaternary sediments provide valuable data to seismic hazard analysis especially relevant for the urban areas. Integration of displacement of geomorphic markers and ages of Quaternary sediment is needed to measure deformation rates accurately. In order to produce data on intermediate-term deformation rates along the Sabzpoushan Fault Zone (SFZ) situated in the Zagros Mountains of south-west Iran, the optically stimulated luminescence (OSL) dating technique was applied to the tectonically influenced terraces of the Mianrod River passing through the fault zone. Field evidence and satellite imagery revealed that geomorphic markers include strike-slip displacement of terraces, different levels of the fluvial markers, shifting in Bakhtiary Formation, fast change in trend of the river and expansion of erosional gully, deformed horizontally along the Fault Zone. These geomorphic indices suggest that Mianrod River deflected along the SFZ as a consequence of faulting during multiple faulting cycles. The OSL dates obtained from the study area indicate that strike-slip deformation rate along the Sabzpoushan Fault Zone is 1–2.8 ± 0.2 mm y−1 (for ∼100 ka). It is suggestive from the research that a significant part of this estimated rate of deformation results from aseismic crustal deformation, but the areas with the highest likelihood of the Sabzpoushan near-surface deformation, as well as the west parts of the city of Shiraz, should be considered as high seismic hazard areas. |
| format | Article |
| id | doaj-art-77c1c74e7ef44c3f97fcb4c567f0a942 |
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| issn | 2211-7148 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
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| series | Results in Earth Sciences |
| spelling | doaj-art-77c1c74e7ef44c3f97fcb4c567f0a9422025-08-20T01:58:08ZengElsevierResults in Earth Sciences2211-71482024-12-01210004510.1016/j.rines.2024.100045On the use of displaced river terraces to characterize active tectonics of the Zagros orogenic belt, SW IranIman Nezamzadeh0Ali Faghih1Behnam Oveisi2Timothy Kusky3Narges Khajavi4Masoumeh Soleimani5Jiannan Meng6Department of Earth Sciences, College of Science, Shiraz University, Shiraz, IranDepartment of Earth Sciences, College of Science, Shiraz University, Shiraz, Iran; Corresponding author.Department of Seismotectonics and Seismology, Geological Survey of Iran, Tehran, Iran; Terry Fox Dr., Ottawa, Ontario K2V 0J5, CanadaThree Gorges Research Center for Geo-hazard, Ministry of Education, China University of Geosciences, Wuhan 430074, ChinaGHD Engineering Consultant, Brisbane, QLD 4000, AustraliaDepartment of Earth Sciences, College of Science, Shiraz University, Shiraz, IranThree Gorges Research Center for Geo-hazard, Ministry of Education, China University of Geosciences, Wuhan 430074, ChinaInvestigating fault deformation in Late-Quaternary sediments provide valuable data to seismic hazard analysis especially relevant for the urban areas. Integration of displacement of geomorphic markers and ages of Quaternary sediment is needed to measure deformation rates accurately. In order to produce data on intermediate-term deformation rates along the Sabzpoushan Fault Zone (SFZ) situated in the Zagros Mountains of south-west Iran, the optically stimulated luminescence (OSL) dating technique was applied to the tectonically influenced terraces of the Mianrod River passing through the fault zone. Field evidence and satellite imagery revealed that geomorphic markers include strike-slip displacement of terraces, different levels of the fluvial markers, shifting in Bakhtiary Formation, fast change in trend of the river and expansion of erosional gully, deformed horizontally along the Fault Zone. These geomorphic indices suggest that Mianrod River deflected along the SFZ as a consequence of faulting during multiple faulting cycles. The OSL dates obtained from the study area indicate that strike-slip deformation rate along the Sabzpoushan Fault Zone is 1–2.8 ± 0.2 mm y−1 (for ∼100 ka). It is suggestive from the research that a significant part of this estimated rate of deformation results from aseismic crustal deformation, but the areas with the highest likelihood of the Sabzpoushan near-surface deformation, as well as the west parts of the city of Shiraz, should be considered as high seismic hazard areas.http://www.sciencedirect.com/science/article/pii/S2211714824000323Deformation rateActive tectonicsOSLGeomorphic markerSabzpoushan Fault ZoneZagros |
| spellingShingle | Iman Nezamzadeh Ali Faghih Behnam Oveisi Timothy Kusky Narges Khajavi Masoumeh Soleimani Jiannan Meng On the use of displaced river terraces to characterize active tectonics of the Zagros orogenic belt, SW Iran Results in Earth Sciences Deformation rate Active tectonics OSL Geomorphic marker Sabzpoushan Fault Zone Zagros |
| title | On the use of displaced river terraces to characterize active tectonics of the Zagros orogenic belt, SW Iran |
| title_full | On the use of displaced river terraces to characterize active tectonics of the Zagros orogenic belt, SW Iran |
| title_fullStr | On the use of displaced river terraces to characterize active tectonics of the Zagros orogenic belt, SW Iran |
| title_full_unstemmed | On the use of displaced river terraces to characterize active tectonics of the Zagros orogenic belt, SW Iran |
| title_short | On the use of displaced river terraces to characterize active tectonics of the Zagros orogenic belt, SW Iran |
| title_sort | on the use of displaced river terraces to characterize active tectonics of the zagros orogenic belt sw iran |
| topic | Deformation rate Active tectonics OSL Geomorphic marker Sabzpoushan Fault Zone Zagros |
| url | http://www.sciencedirect.com/science/article/pii/S2211714824000323 |
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