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Title:: Contrastive Analysis of Landslide between the Yunnan Ludian M_S6.5 and the Jinggu M_S6.6 Earthquake

作者:: 代博洋¹; 吴波²; 常昊¹; 晏祥省³; 白仙富¹; 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

Author(s):: DAI Boyang¹; WU Bo²; CHANG Hao¹; YAN Xiangsheng³; BAI Xianfu¹; 1.Earthquake Administration of Yunnan Province,Kunming 650224,Yunnan,China2.Yunnan Construction investment holding Group Co.,Ltd,Kunming 650501,Yunnan,China3.Yunnan Institute of Geological Environment Monitoring,Kunming 650216,Yunnan,China

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

摘要:: 对时间相近、震级相差不大的2014年8月3日鲁甸M_S6.5地震和10月7日景谷M_S6.6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M_S6.5和景谷M_S6.6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。

Abstract:: 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.