An improved method of Newmark analysis for mapping hazards of coseismic landslides

An improved method of Newmark analysis for mapping hazards of coseismic landslides
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同震滑坡灾害绘制纽马克分析的改进方法

DOI:
10.5194/nhess-20-713-2020
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发表时间:
2019-03
影响因子:
4.6
通讯作者:
Zamora Blanca S.
Zamora Blanca S.
中科院分区:
地球科学3区
文献类型:
--
作者:
Zang Mingdong;Qi Shengwen;Yu Zou;Sheng Zhuping;Zamora Blanca S.

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抽象的。同震山体滑坡会摧毁建筑物、使道路错位、切断管道,并造成重大人员伤亡。因此,准确地绘制同震滑坡造成的危险地图是重要的,但也是具有挑战性的。Newmark方法被广泛应用于评估潜在滑动面上的永久位移和模拟斜坡的同震反应。本文提出了一种改进的Newmark分析方法,通过考虑潜在滑动面的粗糙度和大小的影响来绘制同震滑坡的危险性图。通过对2014年美国地质调查局云南鲁甸6.1级地震中国的案例研究,验证了该方法的有效性。地震引起的永久位移从0到122mg.cm. 。预测的位移与鲁甸地震引发的滑坡的综合清单进行了比较,以使用确定性因子模型绘制同震滑坡危险性的空间变化图。确定性因子表示的同震型滑坡的置信度在−1~0.95之间。根据可信度的空间分布,生成了同震型滑坡危险性图。绘制了预测位移与可信度之间的回归曲线,可用于预测任何感兴趣的地震情景下同震型滑坡的危险性。用曲线下面积来比较改进的Newmark分析和传统的Newmark分析,揭示了改进的Newmark分析的性能。这一测绘程序可用于预测同震滑坡造成的危险,并为基础设施的发展和震后重建提供决策指南。
Abstract. Coseismic landslides can destroy buildings, dislocate roads, sever pipelines, and cause heavy casualties. It is thus important but challenging to accurately map the hazards posed by coseismic landslides. Newmark's method is widely applied to assess the permanent displacement along a potential slide surface and model the coseismic response of slopes. This paper proposes an improved Newmark analysis for mapping the hazards of coseismic landslides by considering the roughness and effect of the size of the potential slide surfaces. This method is verified by data from a case study on the 2014 Mw 6.1 (the United States Geological Survey) Ludian earthquake in Yunnan Province, China. Permanent displacements due to the earthquake ranged from 0 to 122 cm. The predicted displacements were compared with a comprehensive inventory of landslides triggered by the Ludian earthquake to map the spatial variation in the hazards of coseismic landslides using the certainty factor model. The confidence levels of coseismic landslides indicated by the certainty factors ranged from −1 to 0.95. A hazard map of the coseismic landslide was generated based on the spatial distribution of values of the certainty factor. A regression curve relating the predicted displacement and the certainty factor was drawn, and can be applied to predict the hazards of coseismic landslides for any seismic scenario of interest. The area under the curve was used to compare the improved and the conventional Newmark analyses, and revealed the improved performance of the former. This mapping procedure can be used to predict the hazards posed by coseismic landslides, and provide guidelines for decisions regarding the development of infrastructure and post-earthquake reconstruction.
DOI: --
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