Physical Vulnerability Modeling of Urban Textures Against Earthquake in GIS Environment, Case Study: Shiraz City, 3rd Municipal District

During the recent eighty years، a major part of our country has greatly damaged by earthquakes. Therefore، the safety of the cities against the natural hazards is one of the main objectives of urban planning and in this direction، the first step is identifying the Vulnerability of urban elements by using the existing models and methods in this field. Shiraz region exposed repeatedly with devastating earthquakes even with long time distances and a large part of Shiraz has been destroyed about 5 times in the last 900 years. In this study، the effective factors influencing on the physical vulnerability of the 3rd municipal district of Shiraz city against earthquakes has been studied with using vulnerability indicators such as compatibility or incompatibility land uses، building structures، building quality، etc. in a GIS environment. This study shows that organic textures، irregular communication network and lack of proper civic facilities can cause urban vulnerability against the earthquake. After performing the analyses، it was recognized that by considering these factors، district No. 3 is highly vulnerable against earthquake. so that about 65% of the buildings located in this area are in High - very high vulnerability categories. If the earthquake intensity is being considered in the assessment، this percentage will be vary. Therefore، study of such criteria in this area is necessary for reduction of earth quake effects.