Document Type : Original Article
Authors
Department of structure & earthquake, faculty of civil, water & environmental engineering, Shahid Beheshti University, Tehran, Iran
10.22065/jsce.2024.398478.3127
Abstract
Earthquake is one of the strongest natural phenomena that can cause significant human and financial losses to human societies. By knowing the high-risk areas, using site earthquake hazard analysis studies and preventive planning, earthquake risks can be significantly reduced and probable risks caused by earthquakes can be prevented. In this research, the seismic hazard for the neighboring cities of Dorouneh fault system in North-East of Iran is investigated. The mentioned fault system has a total length of more than 700 km and its sliding rate is estimated at 2.5 mm per year. In order to analyze the earthquake hazard of the cities around this fault system, a complete seismic catalog was collected for analysis. Due to the dispersion of magnitude units in the catalog, all units were unified and in order to create statistical independence of the events, Reasenberg's algorithm was used. For faults whose slip rate was known, the slip rate was used in probabilistic hazard analysis. Finally, by identifying the linear and area sources of the studied area and using appropriate attenuation relationships, the results of the seismic risk analysis of the cities of Kashmar, Bardaskan, Tayebad, Bakharz, Torbat-e-Heydarieh, Khalilabad, Anabad and Salamei in two probabilistic (PSHA) and deterministic (DSHA) methods were calculated. The outputs of PSHA showed that the PGA in an earthquake with a return period of 475 years in some of the studied cities is higher than the values recommended by Iran's 2800 standard. For example, the cities of Anabad, Khalilabad, Bardaskan, and Kashmar have a PGA of 0.46, 0.37, 0.35, and 0.34 g, respectively, more than the values recommended in the 2800 standard (0.3 g in the area with high relative risk). Therefore,, it seems necessary to use site specific hazard analysis for these cities.
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