Abstract
The municipal zone 9 in Tehran is highly vulnerable to earthquake owing to possessing a highly weathered residential fabric, proximity to North Tehran Fault, and existing industrial usages. In order to take preventive measures and reduce the damages caused by earthquake, it sounds essential to designate the vulnerable areas and make the required arrangements. In this connection, the present study aims at avaluating the vulnerability of urban buildings in zone 9 of Tehran to various earthquake intensities. For this purpose, 10 effective factors on vulnerability of the aforesaid zone were employed under weighting and fuzzification against earthquake, adopting Analitical Network Process (ANP) - Fuzzy planning models. The selected layers in GIS environment were composed and finally, the generalized vulnerability mapping for the zone was prepared. To predict the damage caused to the urban buildings, the earthquake scenarios in the modified Mercalli intensities of 6, 7, and 8 were developed and implemented on the generalized vulnerability mapping of the zone. Ultimately, the vulnerability degrees of the buildings were grouped into five categories of very low, low, average, high, and very high based on the obtained results. The results of this research indicated that the vulnerability degrees of the urban buildings in the abovesaid range of were respectively 26, 56, 17, 1, and 0% for an earthquake with modified Mercalli intensity of 6, and 21, 10, 52, 16, and 1% for an earthquake with modified Mercalli intensity of 7, and 7, 4, 10, 61, and 18% for an earthquake with modified Mercalli intensity of 8. The results of this research are useful in understanding the capability of GIS spatial anlysis for vulnerability mapping.The information provided by these maps could help citizens, planners and engineers to reduce losses caused by existing and future erthquick by means of prevention, mitigation, and avoidance.
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