| 山脊地形效应的强震动观测研究 |
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| 引用本文： | 周港圣,周游,周正华,魏来,魏鑫,沈欣茹,陈珍.山脊地形效应的强震动观测研究[J].西北地震学报,2022,44(5):1110-1116. |
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| 作者姓名： | 周港圣 周游 周正华 魏来 魏鑫 沈欣茹 陈珍 |
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| 作者单位： | 南京工业大学 交通运输工程学院,江苏 南京 210009;中国地质调查局 国土资源实物地质资料中心,河北 三河 065201;贵州省交通规划勘察设计研究院股份有限公司,贵州 贵阳 550001;黑龙江中医药大学附属第一医院,黑龙江 哈尔滨 150040 |
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| 基金项目： | 国家自然科学基金项目(U2039208，U1839202) |
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| 摘 要： | 根据强震动观测、实验研究与数值模拟结果表明,山脊地形对地震动具有显著影响.文章基于汶川地震主震及余震的三个地形效应观测台阵记录的三分量地震动加速度时程,经基线校正后计算得到各观测点的地面峰值加速度、峰值加速度比和反应谱比,分析山脊地形对地震地面运动的影响.结果表明:山脊地形对地震地面运动的影响显著,其地形地震效应随山脊地形的不同而变化,且地形效应具有方向性;水平向地形效应显著于垂直向;谱比是周期相关的,在所分析的周期范围内谱比不总是大于1．0.
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| 关 键 词： | 地形效应 观测台阵 峰值加速度 反应谱比 地震动 |
Topographic effect of ridge terrains based on strong motion observation data |
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| Zhou Gangsheng,Zhou You,Zhou Zhenghu,Wei Lai,Wei Xin,Shen Xinru,Chen Zhen.Topographic effect of ridge terrains based on strong motion observation data[J].Northwestern Seismological Journal,2022,44(5):1110-1116. |
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| Authors: | Zhou Gangsheng Zhou You Zhou Zhenghu Wei Lai Wei Xin Shen Xinru Chen Zhen |
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| Institution: | College of Transportation Engineering, Nanjing Tech University, Nanjing 210009 , Jiangsu, China;Cores and Samples Center of Land & Resources, China Geological Survey, Sanhe 065201 , Hebei, China;Guizhou Transportation Planning Survey and Design Academe Co., Ltd., Guiyang 550001 , Guizhou, China;First Affiliated Hospital of Heilongjiang University of Chinese Medicine, Harbin 150040 , Heilongjiang, China |
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| Abstract: | The results of the strong motion observation, experimental analysis, and numerical simulation show that ridge terrains can substantially influence seismic ground motion. In this study, the three-component ground motion acceleration time histories of the mainshock and aftershocks of the Wenchuan earthquake recorded by three topographic effect observation arrays were selected. The peak ground acceleration, peak acceleration ratio, and response spectrum ratio of each observation point were obtained after a baseline correction, and the influence of the ridge terrain on earthquake ground motion was analyzed. The results show that the ridge terrain has a remarkable effect on the seismic ground motion, and the topographic effect is directional, varying with the ridge terrain. The topographic effect in the horizontal direction is more significant than that in the vertical direction. The spectral ratio, which is related to the period, is not always greater than 1.0 in the analyzed period. |
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