本文通过对山西“十五”测震台网正式运行的32个子台的环境地噪声分析计算，得到各子台的背景噪声地脉动速度均方根（RMS值）、观测动态范围、噪声信号功率谱。结果表明各子台环境地噪声水平基本符合数字地震观测技术规范要求，但从2008年到2011年的变化动态看，各子台的环境地噪声水平有增大的趋势。

Through the analysis and calculation on environment ground noises of the 32 substations formally running in “the tenth-five-yearly plan” seismic network of Shanxi, root-mean-square of ground motion noise (RMS), observation dynamic range and noise signal power spectrum of background noise of each substation are gained. The result indicates that environment ground noise level of each substation accords with the requirement for digital seismic observation technology criterion and but that as far as the variation dynamics from 2008 to 2011 is concerned, environment ground noise level of each substation has the trend of gradual increasing.