新疆数字地震台站观测动态范围和台基噪声的分析
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摘要
介绍了新疆数字地震台仪器的配置,对新疆23个数字地震台站台基噪声进行分析计算。台站的观测动态范围,反映了观测仪器本身的性能和台基环境干扰背景的水平,有效动态范围大小反映记录地震信号的最大能力。台站(台网)的监测能力不仅取决于仪器的性能,而且还与台基的噪声背景有关。得出了各地震台台基的脉动噪声的均方根值、观测动态范围、地噪声功率谱。有效观测动态范围的大小与数字地震仪的种类和配置有关。新疆23个数字地震台中的21个台的台基地动噪声在1~20 Hz内符合中国数字测震台网技术规程的要求,而另外2个台,即二宫和石河子数字地震台没有达到规定指标。
The article introduces instrument configuration of Xinjiang digital seismic station,and analyzes and calculates station base noise of 23 Xinjiang digital seismic station.Observational dynamic range of station reflects performance of observational instrument and background level of environment disturbance of station base,and effective dynamic range shows the maximal capacity recording seismic signals.Monitoring capacity of station(station network) not only depends on instrument performance,but also is related with background noise level of station base.The article calculates the mean square root values of pulse noise,observational dynamic range and power spectrum of ground noise of all seismic station bases.Effective dynamic range is related with type and configuration of digital seismograph.Ground motion noises of station bases of 21 ones of 23 Xinjiang digital seismic station are in the range of 1 to 10 Hz,which are qualified to technical regulations of Chinese digital seismographic station network.Tow other stations,i.e.Ergong station and Shi Hezi station,are not qualified.
The article introduces instrument configuration of Xinjiang digital seismic station,and analyzes and calculates station base noise of 23 Xinjiang digital seismic station.Observational dynamic range of station reflects performance of observational instrument and background level of environment disturbance of station base,and effective dynamic range shows the maximal capacity recording seismic signals.Monitoring capacity of station(station network) not only depends on instrument performance,but also is related with background noise level of station base.The article calculates the mean square root values of pulse noise,observational dynamic range and power spectrum of ground noise of all seismic station bases.Effective dynamic range is related with type and configuration of digital seismograph.Ground motion noises of station bases of 21 ones of 23 Xinjiang digital seismic station are in the range of 1 to 10 Hz,which are qualified to technical regulations of Chinese digital seismographic station network.Tow other stations,i.e.Ergong station and Shi Hezi station,are not qualified.
引文
[1]中国地震局.地震及前兆数字观测技术规范[M].北京:地震出版社,2001.
[2]任枭,刘瑞丰,梁建宏,等.国家数字地震台网台站地动噪声功率谱分析[J].地震地磁观测与研究,2004,25(1):23-27.
[2]任枭,刘瑞丰,梁建宏,等.国家数字地震台网台站地动噪声功率谱分析[J].地震地磁观测与研究,2004,25(1):23-27.
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