| 2019年10月28日甘肃夏河5.7级地震强地面运动特征分析 |
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| 引用本文： | 王文才,苏小芸,牛延平,陈丽君.2019年10月28日甘肃夏河5.7级地震强地面运动特征分析[J].西北地震学报,2020,42(3):784-790. |
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| 作者姓名： | 王文才 苏小芸 牛延平 陈丽君 |
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| 作者单位： | 甘肃兰州地球物理国家野外科学观测研究站 甘肃省地震局, 甘肃 兰州 730000 |
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| 基金项目： | 甘肃省地震局科技发展基金（2018Y02）；中国地震局2019年三结合课题（3JH-201901004）；甘肃省强震动台站加速度传感器极性检测和方位角普查校正项目（2015-JC073） |
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| 摘 要： | 2019年10月28日甘肃省夏河县发生5.7级地震，中国数字强震动台网的18个专业台站在此次地震中触发。本文处理捕获的54条三分向加速度记录，给出近场台站的地震动参数，绘制了震中附近区域峰值加速度等值线图，其长轴呈WN-ES方向展布。将实际观测数据与几种常用地震动衰减关系对比，发现俞言祥1]短轴衰减预测模型能更好地反映此次地震的影响场。将振幅较大的62LBL、62BLX台的反应谱与我国抗震设计反应谱比较，采用最小二乘法拟合出不同震中距5个台站各周期谱加速度衰减特性，总结了此次地震的反应谱基本特征。运用H/V谱比法对4个典型台站进行场地地震反应分析，研究了局部场地条件对峰值加速度和峰值速度的影响过程。
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| 关 键 词： | 夏河5.7级地震 加速度时程 反应谱 衰减关系 场地反应 |
| 收稿时间： | 2020/2/1 0:00:00 |
Characteristics of Strong Ground Motion Records of the Xiahe,Gansu M5.7 Earthquake on October 28, 2019 |
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| WANG Wencai,SU Xiaoyun,NIU Yanping,CHEN Lijun.Characteristics of Strong Ground Motion Records of the Xiahe,Gansu M5.7 Earthquake on October 28, 2019[J].Northwestern Seismological Journal,2020,42(3):784-790. |
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| Authors: | WANG Wencai SU Xiaoyun NIU Yanping CHEN Lijun |
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| Institution: | Lanzhou National Observatory of Geophysics, Gansu Earthquake Agency, Lanzhou 730000, Gansu, China |
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| Abstract: | A M5.7 earthquake occurred on October 28, 2019 in Xiahe County, Gansu Province. The main shock fully triggered 18 strong motion stations in the China Digital Strong Motion Network (CDSMN), for which we obtained and processed 54 records of three-component acceleration. In this paper, we identify the ground motion parameters of the near-field stations and present the peak acceleration contours near the epicenter. We also compare the actual observed values with several commonly used ground motion prediction equations. After comparing the acceleration response spectra of the 62LBL and 62BLX stations with the design response spectrum in China, we summarize the characteristics of the response spectrum of the M5.7 earthquake. To study the site effect on the peak acceleration and peak velocity, the H/V method was used to perform a seismic site effect analysis of four typical stations. |
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| Keywords: | Xiahe earthquake acceleration time-history response spectrum attenuation relationship site effect |
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