摘要
国家烈度速报与预警工程重庆子项目实施过程中,部分台站地震计坑因潮湿渗水,改造为地表摆墩观测。对改造前后的观测数据进行功率谱密度计算,用1/3倍频程滤波器在1~20 Hz频带范围内计算地噪声水平,进而得到台站有效测量动态范围。对比分析台站改造前后数据计算结果,显示改造后台站噪声水平有所增加,其中东西向、南北向最大增加9 dB,垂直向最大增加5 dB,但环境地噪声水平仍符合观测规范要求。鉴于地震计墩改造对观测数据产生影响,本文提出了更为合理的浅式半地下室改造方案。
During the Earthquake warning Engineering of Chongqing,some deep pit seismic stations have been reformed to ground observation.Calculate the power spectral density of observation data before and after reconstruction,then uses the 1/3 octave filters calculate rms in the range of 1~20 Hz frequency band,so the effective dynamic range of the station is obtained.Analysis the calculation results from before and after reformation data,it shows that the noise level of the seismic station is increased,maximum increase of EW and NS is 9 dB,and the UD is 5 dB,the noise level still meets the technical requirement for the observational environment of seismic stations.For the influence of modified seismometer pier observation data,this paper puts forward a more reasonable semi-underground reconstruction scheme.
作者
杨亚运
傅卓
马伟
YANG Yayun;FU Zhuo;MA Wei(Chongqing Earthquake Agency,Chongqing 401147,China)
出处
《高原地震》
2021年第2期44-50,57,共8页
Plateau Earthquake Research
基金
重庆市地震局2021年科研项目(项目编号:CQDZ2021003)资助。
关键词
预警工程
功率谱密度
地噪声水平
有效动态范围
环境噪声水平
Earthquake early warning project
Power spectral density
Ground noise level
Effective dynamicrange
Environment ground noise level
