摘要
通过对宜宾珙县震裂斜坡上的3台地震动监测仪器记录到的2022-04-06宜宾兴文MS5.1地震地震波传播数据进行滤波和基线校正,分析时程曲线、傅里叶频谱和加速度反应谱。结果表明:1)本次地震持时短、幅度小,2^(#)和3^(#)监测点S波持时较1^(#)监测点长2~5 s;2)傅里叶频谱显示,水平方向低频衰减、中高频放大、频带变宽,垂直方向变化不明显;3)以1^(#)监测点为参考,2^(#)和3^(#)监测点峰值加速度(PGA)放大系数为1.17~3.05,阿里亚斯强度(AI)放大系数在EW和UD向为4.43~7.59,3^(#)监测点NS向可达18.86;4)对比分析芦山仁家村(非震裂斜坡)监测剖面,认为珙县震裂斜坡存在放大效应。
The 2022-04-06 Xingwen MS5.1 earthquake triggered three seismic monitoring instruments laid on the shatter slope in Gongxian county,Yibin city,and the seismic wave propagation data was completely recorded.Through data filtering and baseline correction,we analyze the time history curve,Fourier spectrum and acceleration response spectrum.The results show that:1)The holding time of this earthquake is short,the amplitude is small,and the S-wave holding time of the 2^(#)and 3^(#)monitoring points is 2-5 s longer than that of the 1^(#)monitoring point.2)Fourier spectrum shows low frequency attenuation,medium and high frequency amplification,and frequency band widening in the horizontal direction,but the change in the vertical direction is not obvious.3)Take the 1^(#)monitoring point as reference,the peak acceleration(PGA)amplification coefficient of 2^(#)and 3^(#)monitoring points is 1.17-3.05,the Arias intensity(AI)amplification coefficient is 4.43-7.59 in the EW and UD directions,and the NS direction of the 3^(#)monitoring point can reach 18.86.4)Compared with the monitoring profile of Renjia village(non-shatter slope)in Lushan,we believe that there is an amplification effect of the Gongxian shatter slope.
作者
寇瑞斌
王运生
胡东雨
唐涛
詹明斌
向超
吴昊宸
赵方彬
KOU Ruibin;WANG Yunsheng;HU Dongyu;TANG Tao;ZHAN Mingbin;XIANG Chao;WU Haochen;ZHAO Fangbin(College of Environment and Civil Engineering,Chengdu University of Technology,1 Dongsan Road,Chengdu 610059,China;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,1 Dongsan Road,Chengdu 610059,China)
出处
《大地测量与地球动力学》
CSCD
北大核心
2023年第3期282-288,共7页
Journal of Geodesy and Geodynamics
基金
国家自然科学基金(41877235)
国家重点研发计划(2017YFC1501000)。
关键词
震裂斜坡
峰值加速度
阿里亚斯强度
放大效应
shatter slope
peak acceleration
Arias intensity
amplification effect
