| 2021年青海玛多7.4级地震强震动记录及特征分析 |
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| 引用本文： | 王维欢,王文才,尹欣欣,陈继锋,陈晓龙.2021年青海玛多7.4级地震强震动记录及特征分析[J].西北地震学报,2021,43(4):883-889,895. |
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| 作者姓名： | 王维欢 王文才 尹欣欣 陈继锋 陈晓龙 |
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| 作者单位： | 1.甘肃省地震局，甘肃 兰州 730000;2.甘肃兰州地球物理国家野外科学观测研究站，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）；中国地震局三结合课题（3JH-201901004）；甘肃省地震局科技发展基金（2016Q02） |
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| 摘 要： | 2021年5月22日,青海省果洛州玛多县发生7.4级地震,中国强震动观测网络在主震中捕获16组强震动数据。对48条三分向加速度记录进行基线校正、滤波等常规处理,计算相应的地震动参数,发现位于断层破裂前向位置的63DAW台NS向记录的地震动速度波形具有长周期分量丰富的特征。分析6个典型台站的单自由度加速度反应谱,并与我国建筑抗震设计谱比较,分析此次地震的频谱特性。将实际观测到的PGA、PGV和S_a(T=0.1 s、T=1.0 s、T=2.0 s、T=5.0 s)与国内广泛使用的几种地震动预测模型对比,研究此次地震的影响场。通过分析S_a-S_d曲线,探讨此次地震靠近断层区域地面运动大位移与桥梁落梁震害间可能存在的关系。
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| 关 键 词： | 玛多7.4级地震 加速度时程 反应谱 衰减规律 |
| 收稿时间： | 2021/6/9 0:00:00 |
Strong motion records and characteristics of the MaduoM7.4 earthquake in Qinghai Province, 2021 |
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| WANG Weihuan,WANG Wencai,YIN Xinxin,CHEN Jifeng,CHEN Xiaolong.Strong motion records and characteristics of the MaduoM7.4 earthquake in Qinghai Province, 2021[J].Northwestern Seismological Journal,2021,43(4):883-889,895. |
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| Authors: | WANG Weihuan WANG Wencai YIN Xinxin CHEN Jifeng CHEN Xiaolong |
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| Institution: | 1.Gansu Earthquake Agency, Lanzhou 730000, Gansu, China;2.Gansu Lanzhou Geophysics National Observation and Research Station, Lanzhou 730000, Gansu, China |
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| Abstract: | On May 22, 2021, an M7.4 earthquake occurred at Maduo County, Qinghai Province.16 sets of three-component acceleration records of the main shock were obtained by CDSMON.In this paper, 48 three-component acceleration records were processed by baseline correction and filtering, and corresponding ground motion parameters were calculated.To analyze the spectral characteristics of this earthquake, the acceleration response spectra of six typical stations were analyzed and compared with the seismic design spectra of buildings in China.The actual observation records of PGA, PGV, and Sa (T=0.1 s, T=1.0 s, T=2.0 s, T=5.0 s) were compared with several ground motion prediction models widely used in China to study the influence field of the M7.4 earthquake.Through the analysis of Sa-Sd curves, the possible relationship between the large displacement of ground motion near the fault area and the bridge unseating damage was discussed. |
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| Keywords: | Maduo M7 4 earthquake resoibse acceleration time-history response spectrum the attenuation relationship |
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