成都地震台测震记录中干扰特征的研究

Research on Interference Characteristics in Seismic Records of Chengdu Seismic Station

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-1T 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-1T 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.