Risk assessment of secondary geological disasters induced by the Yushu earthquake |
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| Authors: | Quanfu Niu Weiming Cheng Yong Liu Yaowen Xie Hengxing Lan Yanrong Cao |
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| Institution: | Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China 3 Gansu Provincial Electric Power Design Institute,Lanzhou 730000,China |
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| Abstract: | The Yushu Ms 7.1 earthquake occurred on April 14, 2010 in Qinghai Province, China. It induced a mass of secondary geological
disasters, such as collapses, landslides, and debris flows. Risk assessment maps are important for geological disaster prevention
and mitigation, and also can serve as a guide for post-earthquake reconstruction. Firstly, a hazard assessment index system
of secondary geological disasters in the earthquake region was built in this paper, which was based on detailed analysis of
environmental and triggering factors closely related to geological disasters in the study area. GIS technology was utilized
to extract and analyze the assessment index. Hazard assessment maps of secondary geological disasters were obtained by spatial
modeling and overlaying analysis. Secondly, an analysis of the vulnerability of hazard bearing bodies in the area was conducted,
important information, such as, population density, percentage of arable land, industrial and agricultural outputs per unit
area were regarded as assessment indices to evaluate socioeconomic vulnerability. Thirdly, the risk level of secondary geological
disasters of the area was obtained by the formula: Risk=Hazard × Vulnerability. Risk assessment maps were categorized into
four levels, including “low”, “moderate”, “high” and “very high”. These results show that some urban areas are at very high
risk, including Jiegu, Chengwen, Xiaxiula and Sahuteng towns. This research can provide some references and suggestions to
improve decision-making support for emergency relief and post-earthquake reconstruction in the study area. |
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| Keywords: | Yushu Earthquake Secondary geological disasters(SGD) Hazard assessment Socio-economic vulnerability Risk assessment |
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