2014年云南鲁甸地震触发地质灾害发育分布规律及与景谷、盈江地震对比研究

发布时间：2018-12-25 10:12

【摘要】：2014年8月3日16时30分,云南省鲁甸县龙头山镇Ms6.5级地震造成617人死亡,触发1700多处崩塌滑坡等地质灾害点,同年,该省又发生了Ms6.6级景谷地震和Ms6.1级盈江地震。笔者在对鲁甸等3次地震区次生地质灾害现场调查和遥感解译的基础上,研究了鲁甸地震触发地质灾害的发育分布规律,首次提出了地震"干滑坡"的概念,并从震级、地形地貌、活动构造、人口密度等多个方面对比了鲁甸地震、景谷地震和盈江地震触发地质灾害的异同点。主要结论有:1鲁甸地震后新增地质灾害数量显著增加,其主要分布在水系的深切峡谷区,表现为"干滑坡"特征;2大型、特大型崩塌滑坡灾害点主要受活动断裂控制;3地震地质灾害的发育特征与地貌高程和微地貌具有很好的响应关系;4鲁甸震区的地形坡度明显大于景谷和盈江震区,地形坡度是鲁甸地震区地质灾害发育的主要控制因素;5我国西南高山峡谷区的断层、河流、阶地和城镇是相互依存,不可分割的地质环境载体,震后房屋选址、重建规划不仅要注意房屋抗震问题,还应充分考虑地质环境安全问题。
[Abstract]:At 16:30 on Aug. 3, 2014, the earthquake of magnitude Ms6.5 in Longtoushan Town, Ludian County, Yunnan Province, caused 617 deaths and triggered more than 1700 geological hazards such as landslides and collapses. In the same year, the Jinggu earthquake of magnitude Ms6.6 and the Yingjiang earthquake of magnitude Ms6.1 occurred again in the province. On the basis of field investigation and remote sensing interpretation of secondary geological hazards in Ludian and other earthquake areas, the authors studied the development and distribution of geological hazards triggered by the Ludian earthquake, and proposed for the first time the concept of "dry landslide" and the magnitude of the earthquake. The similarities and differences of geological disasters triggered by the Ludian earthquake Jinggu earthquake and Yingjiang earthquake are compared in many aspects such as topography active structure and population density. The main conclusions are as follows: (1) the number of new geological hazards increased significantly after the Ludian earthquake, which is mainly distributed in the deep canyon area of the water system, showing the characteristics of "dry landslide", (2) the disaster site of large and super large collapses and landslides is mainly controlled by active faults; (3) the development characteristics of seismic geological hazards have a good response relationship with geomorphologic elevation and microgeomorphology, and (4) the landform slope in Ludian earthquake area is obviously larger than that in Jinggu and Yingjiang earthquake areas, and the topographic slope is the main controlling factor for the development of geological hazards in Ludian earthquake area. The faults, rivers, terraces and towns in the mountain and canyon areas of southwest China are interdependent and inseparable geological environment carriers. The post-earthquake housing site selection and reconstruction planning should not only pay attention to the aseismic problems of buildings. The safety of geological environment should also be fully considered.
【作者单位】：中国地质环境监测院;云南地质工程勘察设计研究院昭通分院;
【基金】：国家自然科学基金项目(41372333) 国土资源公益性行业科研专项(201211055)资助成果
【分类号】：P694;P315.9

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