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。

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.

P315

中国地震局监测、预测、科研三结合课题（CEA-JC/3JH-172507）资助