摘要
本文基于Lg谱比法的地震衰减参数与台站场地响应联合反演方法,利用2010—2014年辽宁台网记录的ML≥2.5地震观测资料,反演计算2013年1月23日灯塔5.1级地震前后的Lg波Q值和频率依赖指数η的变化,结果发现灯塔地震区介质的Lg波衰减Q和η在地震前后有明显的变化,且变化趋势相反。Q值在震前整体呈上升的趋势,上升中有小幅的下降,震后有下降恢复的趋势,而地震波衰减特征在区域内表现出对频率较强的依赖。
In this paper,using the joint inversion method of seismic attenuation parameters and station site response based on Lg spectral ratio method,we get the variation of the Lg wave Q and frequency dependence indexηvalue before and after the Dengta 5.1 earthquake on July 23,2013 from the M_(L)≥2.5 seismic observation data recorded by Liaoning network from 2008 to 2014.The results show that the attenuation Q andηof Lg wave are changed obviously and their variation tendency is opposite before and after the earthquake.Q value shows an overall upward trend before the earthquake,with a slight downward trend halfway and then went down to recovery after the earthquake,while seismic wave attenuation characteristics show strong dependence on frequency in the region.
作者
邵媛媛
夏彩韵
王岩
任雪
SHAO Yuan-yuan;XIA Cai-yun;WANG Yan;REN Xue(Liaoning Earthquake Agency,Liaoning Shenyang 110034,China)
出处
《防灾减灾学报》
2022年第2期31-35,共5页
Journal of Disaster Prevention And Reduction
基金
中国地震局星火计划青年项目(XH18014Y)
中国地震局震情跟踪项目(20191007)。
关键词
Lg波衰减
谱比法
灯塔地震
Lg wave attenuation
spectral ratio method
Dengta earthquake
