南京市测震台网台站背景噪声分析与应用

Analysis and Application of Seismic Station Background Noise in Nanjing Seismic Network

地震观测台站背景噪声水平是影响台网地震监测能力的重要因素。通过分析南京市属台站的噪声水平和背景噪声功率谱概率密度函数分布,发现2017年与2018年因受较多因素干扰,背景噪声水平整体高于2016年,结合仪器故障、溧水观音寺施工及六合台体应变施工等事件,探讨了如何及时发现观测环境的变化及仪器故障对台基噪声数据的影响。结果表明,研究台站背景噪声的变化,对了解台站数据记录质量、监控台站观测环境以及地震观测系统健康状态具有一定的参考意义。

The background noise level of seismic observation stations is an important factor affecting the seismic monitoring ability of the network. By analyzing the noise level and the distribution of power spectrum probability density function of background noise in Nanjing,it is found that the background noise level of 2017 and 2018 is higher than that of 2016 because of the interference of many factors. Combining instrument malfunction and some events concluding the construction of Guanyin Temple in Lishui and the strain construction of Liuhe Platform,how to find out the change of observation environment and the influence of instrument fault on the noise data of the platform in time are discussed. The results show that the study of background noise is of great significance for understanding the quality of station data recording,monitoring the observation environment and the health status of seismic observation system.