乌加河地震台、乌力吉地震台台基噪声特征对比分析

利用2020年5月1—7日乌加河地震台、乌力吉地震台波形数据，应用噪声功率谱概率密度（PDF）方法，计算2个台站的台基噪声，分析了2种观察环境下的台基噪声特征及影响因素。结果显示，在小于0.1 Hz频段乌力吉地震台台基噪声值明显大于乌加河地震台，说明地震计在小于0.1 Hz频段受环境温度影响的特征较显著；在大于1 Hz频段2个台站台基噪声值均有台阶性升高频段，这是由在该频段台基噪声受人为活动影响所致。

Comparative analysis of background noise characteristics of Wujiahe station and Uliji station

This article uses the waveform data of Wujiahe Central Seismic Station and Uliji Station from May 1 to May 7, 2020 and applies noise power spectrum probability density (PDF) method to calculate the background noise level of these two stations. The characteristics and influencing factors of station-background noise under two observation environments are studied. The results show that, in the frequency band below 0.1 Hz, the noise value of Wuliji station is significantly higher than that of Wujiahe station. It illustrates that the seismometer is significantly affected by ambient temperature in the frequency band below 0.1 Hz. In the frequency band higher than 1 Hz, the background noise of both stations show a stepped increase frequency band and this is due to the influence of man-made activities on the background noise of the station in this frequency band.