新冠疫情防控措施对新疆地区地球背景噪声影响分析

2020年7月中旬至8月下旬，新疆地区采取疫情防控措施。选取2020-06~2020-09新疆台网28个宽频带数字地震计的波形数据，获取相应的PSD（功率谱密度）和PDF（概率密度函数），统计不同频段PSD值分布情况，分析疫情期间新疆地区噪声水平变化特征。结果显示，受新冠疫情的影响，乌鲁木齐地区高频段（2~20 Hz）噪声水平下降4.5%，其他地区也出现不同程度的降低，主要影响因素为人类活动的持续减少。同时，这种噪声减弱现象也由地表传达到地下。

Analysis of the Impact of COVID-19 Prevention and Control Measures on Earth Background Noise in Xinjiang

From middle July to late August 2020, quarantine measures are taken in Xinjiang due to the impact of COVID-19. We select the waveform data of 28 broadband digital seismometers from Xinjiang network from June to September 2020, obtain the corresponding PSD (noise power spectral density) and PDF (probability density function), and count the distribution of PSD values in different frequency bands according to the situation. We analyze the characteristics of noise level changes in Xinjiang during the epidemic period. The results show that due to the impact of COVID-19, the noise level in the high frequency band (2－20 Hz) in Urumqi has dropped by 4.5%, and other areas have experienced different degrees of reduction. The main influencing factor is the continuous reduction of human activities. At the same time, this noise blanking phenomenon is also transmitted from the surface to the underground.