| 基于强震记录的唐山5.1级地震强地面运动特征及局部场地效应分析 |
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| 引用本文： | 王文才,杨晓鹏,苏小芸,陈丽君,王燕,刘红玫.基于强震记录的唐山5.1级地震强地面运动特征及局部场地效应分析[J].大地测量与地球动力学,2021,41(10):1063-1068. |
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| 作者姓名： | 王文才 杨晓鹏 苏小芸 陈丽君 王燕 刘红玫 |
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| 作者单位： | 甘肃省地震局,兰州市东岗西路450号,730000;甘肃兰州地球物理国家野外科学观测研究站,兰州市东岗西路450号,730000;甘肃省地震局,兰州市东岗西路450号,730000 |
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| 摘 要： | 利用京津冀地区214个强震台捕获的2020-07-12唐山市古冶区5.1级地震加速度波形记录，统计分析记录数量随震中距变化的特征，绘制峰值加速度等值线图。将近场6个土层台记录的线弹性反应谱与我国抗震设防反应谱进行比较，采用传统谱比法分析近场局部土层对地震动的放大作用。将观测的谱加速度与国内常用的几种地震动预测模型进行对比，计算其归一化残差，研究中、远场局部场地条件对地震动幅度和主要作用周期的影响，给出各周期谱加速度的空间展布，并结合场地环境分析中场地震动被显著放大的原因。
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| 关 键 词： | 唐山5.1级地震 地面运动 反应谱 衰减关系 场地反应 |
Analysis of Strong Ground Motion Characteristics and Local Site Response of the 2020 Tangshan M5.1 Earthquake |
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| WANG Wencai,YANG Xiaopeng,SU Xiaoyun,CHEN Lijun,WANG Yan,LIU Hongmei.Analysis of Strong Ground Motion Characteristics and Local Site Response of the 2020 Tangshan M5.1 Earthquake[J].Journal of Geodesy and Geodynamics,2021,41(10):1063-1068. |
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| Authors: | WANG Wencai YANG Xiaopeng SU Xiaoyun CHEN Lijun WANG Yan LIU Hongmei |
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| Abstract: | Using the acceleration waveform records of 214 strong seismic stations in Beijing-Tianjin-Hebei region captured by the M5.1 earthquake in Guye district of Tangshan city on July 12, 2020, we analyze the variation characteristics of the records number with the epicenter distance and draw the contour map of peak acceleration. We compare the linear elastic response spectrum recorded by 6 soil stations with the designed spectrum of China, and analyze the amplification effect of soil layers on ground motion using the traditional spectral ratio method. By comparing the observed data with some commonly used GMPE(ground motion prediction equations), we analyze the attenuation relationship of PGAs with different distance. By calculating the normalized residuals between predicted and observed values, we discuss the influence of deep overburden soil and soft soil on ground motion. We study the effects of local site conditions on the amplitude and main period of ground motion, plot the spatial distribution of the spectral acceleration with different period, and explain why the ground motion at medium distance is significantly magnified combined with the site environment. |
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| Keywords: | Tangshan M5 1 earthquake ground motion response spectrum attenuation relationship site response |
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