芦山7.0级地震宏观场地效应
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摘要
继汶川地震之后,2013年4月20日四川省庐山县又发生了7.0级强烈地震,其场地条件对震害的影响目前认识较少。通过专项工作,考察了雅安雨城区、芦山县、天全县、宝兴县等地区的结构震害及其场地条件,包括软土场地、老河床、不利地段、潜在滑坡等,分析了不同场地条件与震害的关系。结果表明,此次地震震害与场地条件有较密切关系,震害形式主要表现为软土震陷、河谷地形控制震害分布、不利地段加重震害、潜在滑坡的威胁、地质灾害堵塞交通等,其中软土震陷、河谷地形震害分布、不利地段处理都是值得深入研究的问题。
After Wenchuan Earthquake in 2008,a strong earthquake with magnitude Ms7.0 hit Lushan county,Sichuan province again on April 20,2013,and there are few reports about the effect of site conditions on earthquake damage of this earthquake.By special field work,the structures damage and their site conditions are investigated in five areas,as Yucheng district,Lushan county,Tianquan county and Baoxing county.The site conditions mainly include soft sites,old rive bed,seismic unfavorable sites,potential landslide,etc.And the relationship between site condition and earthquake damage is analyzed.The results are shown that the earthquake damage has close relationship with site conditions,and the damage styles are soft site subsidence,river valley topography controlling disaster distribution,unfavorabling site aggravating the damage,potential landslide aggravating the damage,geologic disaster blocking the traffic.Among them,soft site subsidence,river valley topography controlling disaster and handling unfavorable site are all worth studying.
After Wenchuan Earthquake in 2008,a strong earthquake with magnitude Ms7.0 hit Lushan county,Sichuan province again on April 20,2013,and there are few reports about the effect of site conditions on earthquake damage of this earthquake.By special field work,the structures damage and their site conditions are investigated in five areas,as Yucheng district,Lushan county,Tianquan county and Baoxing county.The site conditions mainly include soft sites,old rive bed,seismic unfavorable sites,potential landslide,etc.And the relationship between site condition and earthquake damage is analyzed.The results are shown that the earthquake damage has close relationship with site conditions,and the damage styles are soft site subsidence,river valley topography controlling disaster distribution,unfavorabling site aggravating the damage,potential landslide aggravating the damage,geologic disaster blocking the traffic.Among them,soft site subsidence,river valley topography controlling disaster and handling unfavorable site are all worth studying.
引文
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