The fast loss assessment of the Wenchuan Earthquake

The damage matrixes of the residential building with different structure systems in Sichuan,Shanxi and Gansu Provinces were derived based on the historical seismic damage statistical data and past studies.Using the seismic intensity map developed by China Earthquake Administration and the social economy statistical data of the three provinces,such as the population,per-capita living space,the proportion of residential building with different structure systems,a fast loss assessment after the earthquake was implemented.Residential building damage,homeless population and residential economic loss were provided as important indicators for governments during disaster relief.According to the total loss index,the total economic loss or homeless population,Jiangyou,Santai,Anxian,Dujiangyan,Mianzhu and Zhongjiang are six of the considerable counties in loss.According to the per-capita loss index,the per-capita economic loss or homeless population per ten thousand people,Beichuan,Anxian,Wenchuan,Pingwu,Mianzhu,and Qingchuan are six of the most disastrous counties in catastrophe.The per-capita loss index is able to express the disaster severity of a district better.It is also argued that using total loss index is appropriate for evaluating loss grade,whilst per-capita loss index is suitable for assessing disaster severity grade.In addition,a post-earthquake fast loss assessment workflow based on damage matrix considering spatial heterogeneity of intensity was given out.