Earthquake risk zoning in Bastak city using FUZZY-AHP model

Subject Areas :

vahid sohrabi ¹ , mohammad ebrahim afifi ²

1 - Geography and urban planning, Islamic Azad University of Larestan, Larestan, Iran
2 - Assistant Professor of Islamic Azad University, Larestan branch

Received: 2022-10-04 Accepted : 2022-12-21 Published : 2022-11-22

Keywords: Fuzzy, Earthquake, AHP, Bastak city,

Abstract :

Iran is one of the most earthquake-prone countries in the world and its cities have suffered a lot of damage due to this natural hazard. Knowing the areas exposed to these risks is one of the first steps in risk management and development and construction planning. In this research, the aim is the zoning of earthquake risk in Bestak city using the FUZZY-AHP model. The research method was descriptive-analytical. In the descriptive discussion, the necessary data were collected using library and documentary studies, and in the analytical discussion, fault maps, earthquakes, elevations, waterways and canals network maps, slope value maps, etc. were prepared, and then with the geographic information system ( GIS) each of the factors of the layers was valued and finally the final map was obtained by overlapping with the AHP model. Bestak city is one of the subordinate cities of Hormozgan province, located between the geographical coordinates of ˝00 21 ° 54 ° to ˝ 11 22 ° 54 longitude and ˝00 11 ° 27 to ˝02 12 ° 27 latitude is located. This map was proposed based on the geomorphological and land use conditions and the areas prone to urban development. The results showed that the physical development of the city during the past decades was subject to the topographical conditions and there are many geomorphological risks and limitations in the study area. According to the results of the research on the optimal location of city development, according to the experts, the parameter of gasoline pumps in the city center has the highest weight of 0.195 and the earthquake parameter has the lowest weight of 0.01 in a pairwise comparison. Finally, the final map resulting from the overlapping of all factors was obtained. According to the maps obtained by overlaying the AHP model and applying weights to the information layers, the earthquake vulnerability classes included very low, low, medium, high and very high. The area of the classes was 11.25, 9.53, 13.17, 15.69 and 9.58, respectively. A large area of the study area is at high risk; Therefore, solutions for crisis management should be implemented when necessary.