陇南山区局部地形对地震动强度的影响

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英文篇名：Influence of Local Topography on Ground Motion in Mountain Region of Southern Gansu Province 中文刊名：西北地震学报 英文刊名：Northwestern Seismological Journal 作者：孙崇绍 ; 闵祥仪 ; 周民都 英文作者：SUN Chong-shao ; MIN Xiang-yi ; ZHOU Min-du(Lanzhou Institute of Seismology ; CEA ; Lanzhou 730000 ; China) 中文关键词：汶川大地震 ; 地震动 ; 流动台 ; 局部孤突地形 ; 峰值加速度 ; 均方根值 英文关键词：Great Wenchuan earthquake ; Ground motion ; Mobile station ; Local isolated-protruding topography ; Peak acceleration ; Root-mean-square(RMS) 出版日期：2011-12-30 机构：中国地震局兰州地震研究所; 年：2011 期：04 出版单位：西北地震学报

摘要

利用汶川大震后在文县县城附近架设在同一地点不同高度的三个流动台获取的7次强余震的记录,通过对原始记录做零线调整并计算记录时程均方根值,研究了局部地形高差对强震地震动的影响。结果表明,局部孤突地形对地震动加速度有明显的放大作用,在进行山区建筑选场和城镇规划时必须充分考虑局部地形的放大作用和影响。
Based on seven strong aftershock accelerograms recorded by three mobile stations installed on the top,half way and foot of a small hill respectively near Wenxian county town after the great Wenchuan earthquake,through adjusting the reference line of the records and calculating the root-mean-square(RMS) of the records,the influence of the local topography on ground motion during strong shocks are studied.The result shows that the isolated-protruding topography has obviously amplifying action to the ground motion acceleration.So it is necessary to evaluate the influence of local topography on ground motion during strong shocks in urban and town planning.

引文

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