四川九寨沟M_s7.0级地震滑坡应急快速评估

发布时间：2018-03-27 17:23

本文选题：九寨沟地震　切入点：地震滑坡危险性　出处：《地质力学学报》2017年05期

【摘要】：基于地震滑坡危险性评估的Newmark累积位移模型,利用震前获取的震区地形数据、区域地质资料,结合地震动近实时获取技术,开展了四川九寨沟M_s7.0级地震诱发滑坡的应急快速评估。地震滑坡位移分析结果表明,同震滑坡活动的中—高强度区分布在断层两侧宽约4 km的带状区域内,整体沿北西方向延伸。其中,极震区的丰雪塘、日则和干海子等城镇驻地及附近道路的滑坡强度相对较高;震前、震后影像对比表明九寨沟地震诱发的滑坡类型以浅表型碎屑流及小规模崩塌为主,且同震碎屑流多是在震前已有碎屑流的基础上进一步活动扩展而来,震后汛期泥石流隐患也不容忽视;通过典型地区滑坡位移分析结果与震前、震后影像对比,表明滑坡位移分析结果能够较好的反映同震滑坡的宏观分布特征,但在场地尺度上吻合程度欠佳,后续将通过提升岩性和地形等数据质量进行改进。研究结果可为灾情研判提供宝贵信息,对提高灾害应急救援效率具有重要意义。
[Abstract]:Based on the Newmark cumulative displacement model of seismic landslide risk assessment, using the topographic data and regional geological data obtained before the earthquake, combined with the near real-time acquisition technology of ground motion, The rapid emergency assessment of landslide induced by the Jiuzhaigou earthquake (M _ S M_s7.0) in Sichuan Province is carried out. The results of landslide displacement analysis show that the medium-high intensity area of co-seismic landslide activity is distributed in a zonal area with a width of about 4 km on both sides of the fault. The landslide intensity of Fengxuetang, Rizai and Qianhaizi towns in the extreme earthquake area and nearby roads is relatively high; before the earthquake, The comparison of post-earthquake images shows that the types of landslides induced by the Jiuzhaigou earthquake are mainly shallow clastic flows and small scale collapses, and the coseismic debris flows are mostly extended on the basis of the existing clastic flows before the earthquake. The hidden dangers of debris flow in flood season after earthquake can not be ignored, and the results of landslide displacement analysis in typical areas are compared with those before and after the earthquake, which shows that the results of landslide displacement analysis can reflect the macroscopic distribution characteristics of co-seismic landslides. However, the degree of coincidence on site scale is not good, and the subsequent improvement will be carried out by improving the quality of data such as lithology and topography. The results of the study can provide valuable information for the study of disaster situation, and are of great significance for improving the efficiency of disaster emergency rescue.
【作者单位】：中国地质科学院地质力学研究所;国土资源部新构造运动与地质灾害重点实验室;中国地质调查局;
【基金】：国家自然科学基金(41372374,41572313) 中国地质调查局地质调查项目(DD20160271,12120114035501)
【分类号】：P315.9;P642.22

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