短周期与宽频带数字地震计记录波形相关分析
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摘要
为了研究短周期与宽频带数字地震观测系统的一致性,分别对山东地震台网青岛、济南、荣成、五莲、烟台的5个同一摆墩上安装的两套观测系统记录的同一地震事件波形资料进行了相关性分析。先将宽频带记录通过等波纹带通滤波器进行频带为1~20 Hz的滤波处理,再将短周期记录进行过采样处理,实现与宽频带记录的采样率一致。分析表明,宽频带和短周期地震计记录近震、地方震和非天然近距离地震波形在形态上一致,地震波形的振幅和相位存在较好相似性,震中距越近地震波形振幅和相位的相似度越高,宽频带和短周期地震计得到速度震级间差别不大,一致性较好。
In order to study the consistency of short period and broadband digital seismic observation system,the relative analysis of earthquake wave records was conducted.These wave data of the same event were recorded by two different observation systems on the same stone block in 5 seismic stations.First,the broadband records were filtered and processed through band filter with the frequency band from 1 to 20 Hz,then the short period records were sampled and processed,finally the short period and broadband records had the same sampling rate.The analysis result showed that near earthquake,local earthquake and near unnatural earthquake recorded by the short period and broadband seismograph had consistent wave shape and velocity magnitude,the amplitude and phase of earthquake wave had better similarity,the nearer epicenter distance,the higher similarity.
In order to study the consistency of short period and broadband digital seismic observation system,the relative analysis of earthquake wave records was conducted.These wave data of the same event were recorded by two different observation systems on the same stone block in 5 seismic stations.First,the broadband records were filtered and processed through band filter with the frequency band from 1 to 20 Hz,then the short period records were sampled and processed,finally the short period and broadband records had the same sampling rate.The analysis result showed that near earthquake,local earthquake and near unnatural earthquake recorded by the short period and broadband seismograph had consistent wave shape and velocity magnitude,the amplitude and phase of earthquake wave had better similarity,the nearer epicenter distance,the higher similarity.
引文
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[2]林纪曾.观测数据的数学处理[M].北京:地震出版社,1981.
[3]吴湘淇.信号系统与信号处理(第一版)[M].北京:电子工业出版社,1996.
[4]蔡亚先,吕永清,周云耀,等.CTS-1甚宽频带地震计[J].大地测量与地球动力学,2004,24(3):109-114.
[5]国家地震局.遥测台网观测技术规范[M].北京:地震出版社,1991.
[6]蒋秀琴,王淑辉,李广平.同一台址数字与模拟观测系统测定震级的对比研究[J].地震地磁观测与研究,2001,22(2):38-45.
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