成都地震台测震记录中干扰特征的研究
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摘要
成都地震台的测震记录长久以来质量不佳,在对地震波形的分析过程中发现2～4Hz干扰对记录质量造成了严重的影响。研究发现,2～4Hz干扰如今广泛存在于成都地震台JCZ-1地震计、JCZ-1T地震计记录的5.5级及以下且震中距大于20°的远震波形、4.5级及以下的近震波形内,已成为成都地震台测震记录中的普遍性干扰,且干扰的产生与仪器响应并无直接关联。
The seismic records of Chengdu Seismic Station have been poor in quality for a long time.During the analysis of seismic waveforms,it was found that the interference of 2～4 Hz had a serious impact on the recording quality.It is now widely existing in the teleseisms of JCZ-1 and JCZ-1 T which magnitude is about 5.5 and epicentral distance is further than 20°.It also exists in the near earthquake of JCZ-1 and JCZ-1 T which magnitude is about 4.5 and below.It has become a common interference in the seismic records of Chengdu Seismic Station and it has no direct correlation with the instrument response.
The seismic records of Chengdu Seismic Station have been poor in quality for a long time.During the analysis of seismic waveforms,it was found that the interference of 2～4 Hz had a serious impact on the recording quality.It is now widely existing in the teleseisms of JCZ-1 and JCZ-1 T which magnitude is about 5.5 and epicentral distance is further than 20°.It also exists in the near earthquake of JCZ-1 and JCZ-1 T which magnitude is about 4.5 and below.It has become a common interference in the seismic records of Chengdu Seismic Station and it has no direct correlation with the instrument response.
引文
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[2]中国地震局监测预报司.数字地震观测技术[M].北京:地震出版社,2003.
[3]蔡亚先,吕永清,周云耀,等.JCZ-1超宽频带地震计[J].地壳形变与地震,1995,15(3):3-5.
[4]田文德,叶建庆,胡俊明.成都地震台JCZ-1与JCZ-1T甚宽频带地震仪对比观测分析[J].地震研究,2013,36(3):372-378.