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Investigating the effect of the Kushak fault function on the occurrence of landslides in Ali Abad village
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Mohammad Sgandarpour *   |
| Department of Geological Hazards Research, Natural Disasters Research Institute, Tehran, Iran. , mskandarpoor@yahoo.com |
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Abstract: (390 Views) |
Objective: Landslides are one of the most important geological hazards that cause significant damage to rural and urban settlements around the world every year. One of the factors influencing the occurrence of landslides is tectonic activities, including faulting, which, by creating weak surfaces in mountainous areas and on the slopes of highlands, reduces the resistance of the rock and soil mass and leads to slope movements.
Shear zone of the Kushak fault and on the material of an ancient landslide. The bedrock of the village consists of conglomerate and marl with Gypsum lenses. Approximately one year after the Rudbar- Manjil earthquake in 1369, gradual slope movements began to occur in the Aliabad village area. These movements were triggered by the depletion of water in the village's springs and old aqueduct. During rainy periods, the intensity of slope movement increased, leading to accompanying damage. The aim of this study is to investigate the correlation between the landslide in the village and the activity of the Kushak fault.
Method: Through examination of geological maps, satellite imagery, field observations, and geophysical studies, the location of the Kushak fault in Aliabad village was identified and confirmed. Along the Kushak fault, there are two springs and the main well of an old aqueduct, which experienced reduced flow or drying up following the 1369 Rudbar-Manjil earthquake.
Results: Further studies revealed the presence of another fault located 600 meters south of the Kushak fault, on the downstream slopes of the village, with a tensile mechanism. This fault is associated with numerous springs that also experienced decreased water supply following the 1369 earthquake.
Conclusions: Geoelectrical studies indicated soil saturation up to a depth of 25 meters, indicating that the alignment of the Kushak fault and the F2 fault (identified in the southern slopes of the village) coincided with the occurrence of the Rudbar-Manjil earthquake, leading to reduced spring outflow and subsequent slope saturation. |
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| Keywords: Landslide, Ali Abad Village, Kushk Fault, Alamut |
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Full-Text [PDF 1947 kb]
(37 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2024/05/7 | Accepted: 2024/09/24 | Published: 2024/12/18
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