2014年云南鲁甸MS6.5与云南景谷MS6.6地震滑坡灾害对比分析*

(1.云南省地震局,云南 昆明 650224; 2.云南省建设投资控股集团有限公司,云南 昆明 650501; 3.云南省地质环境监测院,云南 昆明 650216)

鲁甸地震; 景谷地震; 滑坡; 自然地理条件; 玄武岩; 风化作用

Contrastive Analysis of Landslide between the Yunnan Ludian MS6.5 and the Jinggu MS6.6 Earthquake
DAI Boyang1,WU Bo2,CHANG Hao1,YAN Xiangsheng3,BAI Xianfu1

(1.Earthquake Administration of Yunnan Province,Kunming 650224,Yunnan,China)(2.Yunnan Construction investment holding Group Co.,Ltd,Kunming 650501,Yunnan,China)(3.Yunnan Institute of Geological Environment Monitoring,Kunming 650216,Yunnan,China)

Ludian earthquake; Jinggu earthquake; landslide; natural geographical conditions; basalt; weathering

备注

对时间相近、震级相差不大的2014年8月3日鲁甸MS6.5地震和10月7日景谷MS6.6地震造成的滑坡灾害的规模、数量及灾害程度进行对比分析。研究发现造成鲁甸MS6.5和景谷MS6.6地震滑坡重大差异的原因主要是:人文环境的差异、岩性的差异、地形地貌的差异以及植被的差异。对于鲁甸震区而言,巨大的地形高差、玄武岩和碳酸盐岩的广泛分布以及强烈的河流侵蚀作用、冰冻风化与化学风化等多种因素的叠加,是造成地震滑坡频繁发生的主要原因。

On 3 Aug 2014 an earthquake with a magnitude of 6.5 occurred in Ludian.And on Oct.7.2014 magnitude 6.6 earthquake occurred in Jinggu.The two earthquakes occurred in mountain area with little difference in magnitude.By analyzing the scale,amount and degree of the landslide disaster,we can get four reasons.difference between natural and human environment,lithology difference,difference of landform,and difference in vegetation.Landslid occurred around the Ludian earthquake area frequently,mainly due to huge terrain elevation,wide distribution of basalt and carbonate rocks,and river erosion,frost physical(frost)weathering and chemical weathering.