重庆武隆地区地震尾波QC值特征
Characteristics of Seismic Coda Wave QC Value in Wulong Area,Chongqing
汪建 1杨亚运 1魏红梅 1朱祥 1张涛1
作者信息
摘要
为了了解重庆武隆地区地下介质的物性特征,为预测强地面运动和评估地震灾害损失提供一定的参考.本文选取 2012 年 1 月至 2022 年 12 月重庆地震台网记录的武隆地区 56 次ML≥2.0 地震波形资料,采用Sato单次散射模型分别计算了 5 个台站记录的尾波衰减参数,拟合得到武隆地区地震尾波QC值与频率(f)的依赖关系为QC(f)= 41.87±8.69f 0.956 8±0.090 4,表明该地区为低Q0 值(f= 1)和较高频率依赖性(η)的构造活跃区.本文还分析了整个地震序列的尾波QC和值存在短期的异常变化,Q0 值呈"V"形态,η值呈倒"V"形态,η与Q0 值呈反向变化,Q0 值η值随时间的变化,发现在 2017 年武隆MS5.0 地震发生后,WUL和LAX台站记录的Q0 和η经历下降-上升的快速调整过程,表明该区构造活动处于活跃期.
Abstract
We selected the waveform data of 56 earthquakes with ML≥2.0 between January 2012 and December 2022 recorded by the Chongqing Digital Seismic Network in Wulong area.The Sato single scattering model was used to calculate the coda attenuation parameters of 5 station records.The fitting showed that the dependence of the coda QC value on frequency in Wulong area was QC(f)= 41.87±8.69f 0.956 8±0.090 4,which indicates that the area is a structurally active area with low Q0 value(f = 1)and high frequency dependence(η).We also analyzed the coda QC and η value changes in time.After the Wulong MS5.0 earthquake in 2017,there was a short-term abnormal change in the Q0 and η value recorded by WUL and LAX stations.Specifically,the Q0 value shows a"V"shape,whereas the η value shows an inverted"V"shape.The η value varies inversely with the Q0 value,while the Q0 value undergoes a rapid adjustment through the decrease-increase process,indicating that the tectonic activity in the area is active.
关键词
Sato模型/地震尾波/QC值特征/重庆武隆地区Key words
Sato model/earthquake coda wave/QC value characteristic/Wulong area in Chongqing引用本文复制引用
基金项目
重庆市地震局地震科技创新课题(CQDZQN2024004)
出版年
2024
NETL
NSTL
万方数据