| 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 |
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| Analysis of Record Earthquake Difference in the Ground and Borehole Seismometer in Kunming Station |
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Li Lei, Deng Cunhua, Huang Yao, Qian Wenpin, Tan Wenzheng
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Kunming Seismic Station, Kunming 650204, China
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| 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 |
