昆明基准地震台地面与井下记录地震差异分析
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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。
Select Kunming seismic station placed inside the cave broadband seismograph BBVS-60 and placed in underground deep well broadband seismograph GL-S60 B 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. ② The P wave recorded by the ground and borehole is basically the same. ③ Seismic 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 ～ 8 Hz background difference,is causing the ground and borehole seismic waveform difference of main reasons.
Select Kunming seismic station placed inside the cave broadband seismograph BBVS-60 and placed in underground deep well broadband seismograph GL-S60 B 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. ② The P wave recorded by the ground and borehole is basically the same. ③ Seismic 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 ～ 8 Hz background difference,is causing the ground and borehole seismic waveform difference of main reasons.
引文
蔡耐芳,1990,兰州电传台网天水台井下摆记录特征,地震地磁观测与研究,11(5),51-55.
李雷、钱文品、邓存华等,2017,昆明地震台地面与井下地震观测背景噪声对比,地震地磁观测与研究,38(5),86-95.
毛华锋、张义德、仇中阳等,2014,江苏部分测震台井下与地面观测震源参数对比,四川地震,(3),43-47.
裴晓、尹继尧、杨庭春,2013,张江台地表与深井地震观测对比分析,地震工程学报,35(2),366-371.
仇中阳、郑照福、周政等,2006,淮安地震台井下测震的偏差研究及校正,地震地磁观测与研究,27(增刊),40-50.
仇中阳、毛华峰、陈健等,2014,苏北测震台网地面和井下地震记录波形频谱分析,地震地磁观测与研究,35(3/4),105-111.
《数学手册》编写组,1979,数学手册,837-838,北京:高等教育出版社.
万永革,2012,数字信号处理的MATLAB实现,2版,343-345,北京:科学出版社.
张寿康,张碧晖,左素军,1986,井下与地面地震观测对比研究,华北地震科学,4(4),79-84.
张新东,2002,邯郸台网深井摆与地面摆记录分析对比,地震地磁观测与研究,23(1),65-69.
周焕鹏,1986,深井摆与地面摆的记录差异,地震地磁观测与研究,7(6)65-72。
李雷、钱文品、邓存华等,2017,昆明地震台地面与井下地震观测背景噪声对比,地震地磁观测与研究,38(5),86-95.
毛华锋、张义德、仇中阳等,2014,江苏部分测震台井下与地面观测震源参数对比,四川地震,(3),43-47.
裴晓、尹继尧、杨庭春,2013,张江台地表与深井地震观测对比分析,地震工程学报,35(2),366-371.
仇中阳、郑照福、周政等,2006,淮安地震台井下测震的偏差研究及校正,地震地磁观测与研究,27(增刊),40-50.
仇中阳、毛华峰、陈健等,2014,苏北测震台网地面和井下地震记录波形频谱分析,地震地磁观测与研究,35(3/4),105-111.
《数学手册》编写组,1979,数学手册,837-838,北京:高等教育出版社.
万永革,2012,数字信号处理的MATLAB实现,2版,343-345,北京:科学出版社.
张寿康,张碧晖,左素军,1986,井下与地面地震观测对比研究,华北地震科学,4(4),79-84.
张新东,2002,邯郸台网深井摆与地面摆记录分析对比,地震地磁观测与研究,23(1),65-69.
周焕鹏,1986,深井摆与地面摆的记录差异,地震地磁观测与研究,7(6)65-72。