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昆明基准地震台地面与井下记录地震差异分析
李雷, 邓存华, 黄瑶, 钱文品, 谭文正
昆明基准地震台, 昆明 650204
摘要:
对昆明基准地震台山洞内放置的宽频带地震仪BBVS-60及井下放置的GL-S60B深井宽频带地震仪所记录的地震进行信噪比、P波到时差、波形相关性和频谱分析,得出地面与井下记录地震的差异情况。结果表明:①井下台信噪比与地面台信噪比相比提高有限,仅NS向提升明显;②地面台和井下台记录地震的P波到时基本一致;③在震中距小于3.1°时,地面台和井下台记录地震波波形相关度较低甚至不相关;在震中距大于3.1°后,波形相关度较高;④1.5~8.0Hz背景噪声差异,是震中距小于3.1°时地面台和井下台地震波形差异的主要原因。
关键词:  观测井  宽频带地震仪  信噪比  P波到时差  相关分析  频谱分析
DOI:
分类号:P315
基金项目:中国地震局监测、预测、科研三结合课题(CEA-JC/3JH-172507)资助
Analysis of Record Earthquake Difference in the Ground and Borehole Seismometer in Kunming Station
Li Lei, Deng Cunhua, Huang Yao, Qian Wenpin, Tan Wenzheng
Kunming Seismic Station, Kunming 650204, China
Abstract:
Select Kunming seismic station placed inside the cave broadband seismograph BBVS-60 and placed in underground deep well broadband seismograph GL-S60B recorded seismic data, signal to noise ratio, P wave to time difference, waveform correlation and waveform spectrum analysic were performed and the difference between the ground and borehole is obtained. The results show that:①The signal to noise ratio of underground station is limited compared with that of ground station, only NS is obviously improved. ②The P wave recorded by the ground and borehole is basically the same. ③Seismic waves on the ground and borehole, in the epicentral distance is less than 3.1°, waveform correlation is very low or even irrelevant, after the epicentral distance is greater than 3.1°, waveform correlation is high. ④When the epicentral distance is less than 3.1°, 1.5~8Hz background difference, is causing the ground and borehole seismic waveform difference of main reasons.
Key words:  Observation well  Broadband seismograph  Signal to noise ratio  P to time difference  Correlation analysis  Spectrum analysis