Estimation of earthquake disaster risk loss based on AHP method in western China

Abstract

In today's society, earthquake has brought many hazards to us, including but not limited to building collapse, landslide, soil damage, tsunami, fire and so on. These disasters have taken a heavy toll on our economy. Therefore, from reducing disaster loss to reducing disaster risk, the research on earthquake disaster assessment is the foundation. In this paper, based on the four factors of earthquake risk, exposure degree of disaster-bearing body, vulnerability of disaster-bearing body and ability of earthquake resistance and mitigation, and 12 factors of earthquake intensity and frequency, a risk assessment model of earthquake disaster in western China is constructed, and an evaluation index system is determined. The risk of earthquake disaster in six western provinces of China is evaluated by analytic hierarchy process (AHP), and the evaluation results are compared and analyzed. The results show that each index factor has different influence on the risk disaster in different provinces. The main factors that affect the risk of earthquake disaster in Xizang are the frequency and intensity of earthquake and the natural growth rate of population. The frequency, intensity and unemployment rate of earthquake are the main factors that affect the risk of earthquake disaster in Xinjiang. By analyzing the influence degree of each index on earthquake disaster risk, the weak links of disaster prevention and mitigation in this area can be understood. Among them, earthquake risk is the main factor that causes earthquake disaster risk, and the exposure and vulnerability of the disaster bearing body are also important factors. The risk of earthquake disaster in western China is different. Sichuan province is at the highest risk, while Qinghai province is at the lowest. The evaluation results can provide the decision-making basis for the government to strengthen the management of earthquake prevention and disaster reduction, and reduce the risk of earthquake disaster reasonably and as far as possible.