成都地震台JCZ-1与JCZ-1T甚宽频带地震仪对比观测分析
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摘要
采用成都基准地震台JCZ-1型和JCZ-1T甚宽频带数字地震仪同一时间段记录的地方震、近震和远震的地脉动噪声做功率谱分析。结果表明,JCZ-1和JCZ-1T型甚宽频带地震仪在主要频带内对地噪声的响应程度是一致的。在高频端和低频端JCZ-1T型地震计分辨率更高,且信噪比更高,高出10~20 dB。JCZ-1型地震计由于长期使用导致材料老化以及受环境温度或气流微量变化的影响,地震计的噪声较高,可能对地震波记录的幅值产生5%左右的影响。JCZ-1T型地震计在安装过程中所采取的保温、防气流扰动等各种防护措施是可靠的。
The power spectral densities of earth pulse noise of local,near and distant earthquakes recorded by JCZ-1 and JCZ-1T ultra broadband digital seismometers at the same time in Chengdu Seismic Station are analyzed.The results showthat the response degree of JCZ-1 and JCZ-1T ultra broadband digital seismometers on the earth pulse noise in main frequency band is consistent.However,the resolution of JCZ-1 seismometer is higher than that of JCZ-1 seismometer in the high and lowfrequency end,and the signal-noise ratio of JCZ-1 seismometer is higher,which is about 10~20 dB.On the influence of material aging being in long-term use,environmental temperature or flowtrace changes,the noise of JCZ-1 seismometer is high,and its effect on the amplitude recorded by seismic wave is about 5%.In the installation process of JCZ-1T seismometer,taking preventive measures which are insulation and preventing flowdisturbance etc.are reliable.
The power spectral densities of earth pulse noise of local,near and distant earthquakes recorded by JCZ-1 and JCZ-1T ultra broadband digital seismometers at the same time in Chengdu Seismic Station are analyzed.The results showthat the response degree of JCZ-1 and JCZ-1T ultra broadband digital seismometers on the earth pulse noise in main frequency band is consistent.However,the resolution of JCZ-1 seismometer is higher than that of JCZ-1 seismometer in the high and lowfrequency end,and the signal-noise ratio of JCZ-1 seismometer is higher,which is about 10~20 dB.On the influence of material aging being in long-term use,environmental temperature or flowtrace changes,the noise of JCZ-1 seismometer is high,and its effect on the amplitude recorded by seismic wave is about 5%.In the installation process of JCZ-1T seismometer,taking preventive measures which are insulation and preventing flowdisturbance etc.are reliable.
引文
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张志涌.2000.精通MATLAB5.3版[M].北京:北京航空航天大学出版社.
中国地震局监测预报司.2003.数字地震观测技术[M].北京:地震出版社.
万永革.2007.数字信号处理的MATLAB实现[M].北京:科学出版社.
杨晶琼,杨周胜.2005.云南地震数字遥测台网子台地动噪声分析[J].地震研究,28(1):86-89.
叶建庆,苏金蓉,陈慧.2008.汶川8.0级地震动卓越周期分析[J].地震研究,31(增刊):498-504.
张志涌.2000.精通MATLAB5.3版[M].北京:北京航空航天大学出版社.
中国地震局监测预报司.2003.数字地震观测技术[M].北京:地震出版社.
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