Abstract：We investigate the background noise level, comprising instrument noise and environmental noise, based on observation data of gPhone gravimeter at China University of Geosciences(Wuhan) between 2016 and 2020, focusing on analyzing the dynamic change of background noise before and after the lockdown of Wuhan in 2020. The conclusions are as follows: 1) The noise level for gPhone gravimeter exhibits obvious seasonal variation, with the minimum noise level occurring in the alternate period of spring and summer(mid-May) and a higher noise level in autumn and winter(September to February of the next year); 2) The range of seismic noise magnitude(SNM) for gPhone gravimeter from 2016 to 2020 lies within 3.500-4.278, whereas the range of sub-seismic noise magnitude(SSNM) falls between 4.456-6.136; 3) During the lockdown period in Wuhan(January 23, 2020 to April 21, 2020), the daily SNM value decreased sharply in comparison to the corresponding period in 2019. Only after the full resumption of public transport in Wuhan on April 22, did SNM return to its previous level.
LI Kunlin,WANG Linsong,MA Xian et al. Dynamic Changes of Background Noise Level before and after COVID-19 Lockdown in Wuhan[J]. jgg, 2023, 43(12): 1256-1260.
