环境变化对乌加河地震台观测质量的影响

The influence of environmental change on the seismic observation quality of Wujiahe Seismic Station

针对近年由城镇化建设引起的乌加河地震台观测环境变化、台站记录受到干扰的问题,选取2016—2018年乌加河地震台JCZ-1T地震计的记录数据,采用傅里叶变换,对环境变化引起的噪声频谱进行分析,计算台基平均噪声水平及动态范围变化,并与2015年未受干扰的观测数据进行对比,结果发现,乌加河地震台地脉动噪声水平发生明显变化,地噪声功率谱密度增大,观测动态范围减小.

In view of the disturbance of the observation environment around Wujiahe Seismic Station in recent years due to the urbanization,we select the record data of JCZ-1T seismometer of Wujiahe Seismic Station from 2016 to 2018.We analyse the noise spectrum which caused by the eviromental change using Fourier transform.The power spectral density noise curves are drawn and compared with the undisturbed data in 2015.The results show that the ground pulsation noise level of Wujiahe Seismic Station changes obviously,the power spectrum of ground noise increase and the observation dynamic range decreases.