【摘要】 合理的地震动输入是定量解释震害和烈度异常的基础。以汉源老县城震害为评价基准,确定了汉源老县城高烈度异常区的汶川地震基岩地震动输入。基于汉源老县城周边的九襄、清溪、宜东和乌斯河4个强震台站记录,采用LSSRLI-1程序反演给出了各自台站的水平向基岩地震动;选取汉源县城典型场地,利用LSSRLI-1程序计算给出了不同强震台站基岩地震动作用下的场地地表加速度时程和反应谱,以最可能引起汉源老县城震害的强震台站基岩地震动作为汉源县城的基岩地震动输入。研究结果表明:九襄台站反演的基岩地震动最可能反映汶川地震时汉源老县城的基岩地震动特性,因而用九襄台站的基岩地震动作为汉源老县城的地震动输入解释汉源县城高烈度异常现象是合理的。本文的研究思路为定量解释震害的地震动输入确定提供了重要参考。更多还原

【Abstract】 The reasonable input of ground motion is the basis of quantitatively explaining earthquake damage and intensity abnormality.The bedrock ground motion inputs to high-intensity abnormality area in Hanyuan old county town during Wenchuan M s 8.0 earthquake were determined according to the earthquake damage to Hanyuan old county town.Based on the strong motion records at four stations around the Hanyuan old county town,including Jiuxiang,Qingxi,Wusihe and Yidong,the horizontal bedrock ground motions at each station were back-calculated using one-dimensional equivalent linearization fluctuations program-LSSRLI-1.A typical site lying in Hanyuan old county town was selected,and its acceleration time histories and seismic response spectra of ground surface were computed under the bedrock ground motion at each station employing LSSRLI-1.The bedrock ground motions at the station,whose surface ground motion of the typical site may induce the earthquake damage to Hanyuan old county town,were taken as the earthquake inputs to Hanyuan old county town.The results show that the bedrock ground motions derived from the Jiuxiang strong ground motion station can reflect the features to that in Hanyuan old county town to quite possible extent,and thus it is the most appropriate that the bedrock ground motions derived from the Jiuxiang station are used as the earthquake inputs to Hanyuan old county town.The study ideas utilized by this paper have important referential values for acquiring earthquake inputs for explaining earthquake damage and intensity abnormality.更多还原