甘肃地区地震烈度影响场评价及其与地形因子的关系  

Evaluation of Seismic Intensity Influence Field in Gansu Province and its Relationship with Terrain Factors

作　　者：孙艳萍[1] 陈文凯[1] 周中红[1] 张苏平[1] 何少林[1] 李少华[1] 

机构地区：[1]中国地震局兰州地震研究所,甘肃兰州730000

出　　处：《地震工程学报》2014年第3期697-704,共8页China Earthquake Engineering Journal

基　　金：中国地震局应急救援司地震应急青年重点任务(CEA_EDEM-201307);国家地震社会服务工程甘肃省应急救援系统项目

摘　　要：地震发生后,根据地震参数快速设计和显示出地震影响场,初步确定较为合理的地震烈度分布范围,对于政府及时了解灾情和损失分布非常重要。收集、整理甘肃地区实际地震等震线图,将其与现有地震烈度衰减关系生成的理论烈度图进行统计对比分析,并与研究区DEM(数字高程模型)相结合,研究地形因子对烈度影响场分布的影响。结论表明:不同震级档之间,实际与理论地震烈度分布之间规律不同;分区研究发现,除极震区外,祁连山—河西走廊地区外圈等震线理论长短轴以及面积均大于实际,甘东南地区规律则与之相反。地形因子对烈度影响场的影响是明显的,海拔越高,烈度越高;山顶点处烈度高于周围地区;相对震中而言,坡度大的地方烈度衰减快,反之则烈度衰减慢。The Gansu earthquake emergency command system was founded during the Tenth Five-year Plan by the Earthquake Administration of Gansu province.It was reviewed and accepted by the China Earthquake Administration and was enacted in 2007.With this system,we can first obtain the seismic intensity distribution and influence region according to the local intensity atten-uation relationship and then quickly estimate earthquake casualty loss according to the seismic in-tensity distribution.We can then propose emergency measures and rescue plans and assist in deci-sion-making for earthquake relief headquarters.Damage degrees of construction and lifeline engi-neering,including water supply,power supply,heat supply,air supply,transportation,and com-munication systems,differ among affected areas.Moreover,secondary disaster influences also dif-fer,as well as casualties and financial loss.The seismic influence field examines the influence areas by different damage intensities.After an earthquake,designing and presentation of the influence field according to the earthquake parameters and formulating a relatively reasonable seismic inten-sity distribution range is very important for government investigation of the situation and damage distribution.The feasibility of the earthquake influence field will directly affect the rationality and accuracy of the assessment results.The calculation results of the existing evaluation system differ significantly from the actual results;therefore,the influence of the relief results also differs.The attenuation relationship model makes use of the large-scale nationwide western attenuation rela-tionship,the Gansu attenuation relationship of seismic intensity,and modified seismic intensity af-fecting the field model of the Gansu area in the Gansu earthquake emergency command technolo-gy system module to make fast judgment of the seismic influence field and heavy disaster area. However,differences occur in the actual attenuation relationship among areas and magnitudes due to different source charact

关 键 词：地震烈度影响场 甘肃地区 评价 地形因子 活动构造 

分 类 号：P315[天文地球—地震学]