摘要
应用S变换和广义S变换获得山西地区地震、爆破、塌陷的时频特征,结果表明,S变换可显示不同地震事件较完整的时频分布信息,广义S变换对事件在具体频率的分辨率上有明显的提高,结合两种方法可得到对应事件较完整的时频特征。综合分析认为,地震的震源机制较复杂,高频能量丰富,地震频谱频带范围较宽,一般在0~20 Hz左右,高频成分较多,峰值多在10 Hz;爆破的震源简单,一般主要产生在P波群,爆破的频带较窄,一般在0~10 Hz,频率偏低,一般在3~4 Hz左右;塌陷属于瞬时压缩源,能量释放时间短,波的传播路径简单,频带窄,集中于0~10 Hz,主频率集中在0~3 Hz。
The time-frequency characteristics of earthquakes,blasting and collapses in Shanxi are obtained by using s and generalized S transform.The results show that S transform can display more complete time-frequency distribution information of different seismic events,and generalized S transform can significantly improve the resolution of events in specific frequency.Combining the two methods,the complete time-frequency characteristics of the corresponding events can be obtained.Comprehensive analysis shows that the focal mechanism of earthquakes is relatively complex,high-frequency energy is rich,and the frequency band range of seismic spectrum is the widest,generally around 0~20 Hz.There are many high-frequency components,and the peak value is mostly 10 Hz.The blasting source is simple,generally mainly generated in the P-wave group,and the frequency band is narrow,generally 0~10 Hz,and the frequency is low,generally about 3~4 Hz.Collapse is an instantaneous compression source with short energy release time,simple wave propagation path,the narrowest frequency band,concentrated in 0~10 Hz and the main frequency concentrated in 0~3 Hz.
作者
张娜
王霞
ZHANG Na;WANG Xia(Shanxi Earthquake Agency, Taiyuan, Shanxi 030021, China;National Continental Rift Valley Dynamics Observatory of Taiyuan, Taiyuan, Shanxi 030025, China)
出处
《山西地震》
2022年第1期1-6,11,共7页
Earthquake Research in Shanxi
基金
山西省地震局科研项目(SBK-2021)。
关键词
地震
爆破
塌陷
频谱特征
S变换
Earthquake
blasting
Collapse
Spectrum characteristics
S transform
