摘要
对2021年5月21日云南漾濞6.4级地震获取的28组84条强震动记录进行零线调整和滤波等常规处理,分析了此次地震记录的幅值、频谱以及持时特征。分析结果表明,此次地震峰值加速度范围为0.8~720.3 cm/s2,峰值速度范围为0.1~29.4 cm/s^(2),计算最大仪器地震烈度为8.3度。将实际观测数据与YU2013分区地震动衰减关系对比,结果显示PGA总体上分布于衰减公式误差范围内,预测效果良好。在远场(>250 km)较多台站的PGV观测值大于预测值中位值的加一倍标准差。幅值较大2个台站的加速度反应谱峰值周期均在0.5s以内,其中漾濞台在高频部分三分向加速度反应谱值均超过8度罕遇地震的设计反应谱值。最后计算了5%~75%和5%~95%两种重要持时,结果整体上符合随震中距增大而增大的规律。将两种能量持时结果与BOOMER等(2009)[12]以及TRIFUNAC等(1975)[13]的持时预测方程对比,结果较为一致。
The strong motion data from Yangbi earthquake of May,21,2021 were collected and processed.The amplitude characteristics,response spectrum and significantdurationwere analyzed.The PGA varies from 0.8 to 720.3 cm/s2 and the PGV varies from 0.1 to 29.4 cm/s^(2).The maximum instrumental seismic intensity is 8.3 in China seismic intensity scale.We compared the observed PGA and PGV with the Chinese attenuation relationships used in the seismic ground motion parameter zone map.It shows that the observed PGA consist well the GMPE.The observed PGV in far field(>250 km)is greater than the predicted value.The peak period of acceleration response spectrum of 51YBX and 51DLY is smaller than 0.5s.The short period part of the response spectra of 51YBX islarger than the 8-degree seismic design response spectrum under rare earthquakes.The 5%-75%significant duration and 5%-95%significant duration were calculated;The significant duration grows with the distance.The observed 5%-75%significant duration and 5%-95%significant duration consists well with significant duration prediction equations.
作者
钱亮
解全才
马强
李继龙
QIAN Liang;XIE Quancai;MA Qiang;LI Jilong(Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration,Harbin 150080,China;School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China)
出处
《世界地震工程》
CSCD
北大核心
2021年第4期91-99,共9页
World Earthquake Engineering
基金
中国地震局工程力学研究所基本科研业务费专项资助项目(编号:2019C02)。
关键词
漾濞地震
强震动记录
仪器地震烈度
衰减关系
反应谱
持时
Yangbi earthquake
strong motion records
instrument seismic intensity
attenuation relationship
response spectrum
duration
