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评估西藏东南部的山体滑坡易感性,考虑到地震敏感性

Zang Yeqi¹, Guo Yonggang^1,2, Wang Guowen¹

¹College of Water Conservancy and Civil Engineering, Tibet Agriculture and Animal Husbandry University, Linzhi, China.

|September 23, 2024

概括

4级以上的地震显著增加了西藏东南部的山体滑坡风险. 这项研究绘制了山体滑坡易感性的地图,确定了地震中心附近的高风险区域,以指导防灾工作.

科学领域:

地质科学地质科学
地震工程的工程是地震工程.
自然危害评估自然危害评估

背景情况:

西藏东南部的复杂地质和高地震性导致频繁的地震引起的山体滑坡,威胁基础设施和安全.
滑坡是地震后的主要次要灾害,需要详细的易感性分析.

研究的目的:

分析西藏东南部的山体滑坡易感性,重点关注地震影响.
开发一种精细的模型,用于识别和监测受地震活动影响的容易发生山体滑坡的地区.

主要方法:

使用诸如海拔,坡度,土地使用,降雨量和地震参数等因素构建了一个全面的山体滑坡易感性数据库.
综合频率比 (FR) 和分析层次过程 (AHP) 模型用于易感区分.
经过验证的模型使用接收器操作特征 (ROC) 曲线分析和与地震中心相距的距离.

主要成果:

高度,斜坡方向和距离道路的距离被确定为影响滑坡的关键因素.
发现4级以上的地震显著影响了山体滑坡的发生 (ROC值>0.87).
容易发生山体滑坡的地区与地震焦点的距离有很强的相关性,其中34%的山体滑坡发生在40公里以内.

结论:

开发了一个精细的山体滑坡易感区划框架,包括地震影响和距离震中心的距离.
确定了需要加强监测的关键区域,特别是距离地震焦点40-80公里的地区.
生成的易感性地图为西藏东南部的山体滑坡灾害预防和减轻战略提供了必要的工具.

关键词:

地震地震地震地震地震敏感性的评估.土地滑坡是因为土地滑坡.灵敏度分析是一种灵敏度分析.

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