昭通巡龙测震台台基背景噪声特征分析

ANALYSIS ON BACKGROUND NOISE CHARACTERISTICS OF ZHAOTONG XUNLONG SEISMIC STATION FOUNDATION

选取昭通巡龙测震台2019~2022年相同时段内的地震观测资料,对地震观测数据进行静态地脉动噪声功率谱密度(PSD)估计和静态地脉动速度噪声有效值(RMS)计算。通过数据对比分析,得到昭通巡龙测震台近四年背景噪声变化特征。分析发现,仪器观测频带内整体噪声处于正常水平,年变化形态不明显;随着季节的不断变化,昭通台背景噪声水平也出现相对应的变化,高频部分受人类活动影响,具有明显的季节变化特征。

The seismic observation data in the same period from 2019 to 2022 were selected from the Zhaotong Xunlong Seismic Station,and the static ground pulsation noise power spectral density(PSD)estimation and the static ground pulsation velocity noise effective value(RMS)calculation were performed on the seismic observation data.Through data comparison and analysis,the background noise variation characteristics of Zhaotong Xunlong Seismic Station in the past four years are obtained.The analysis found that the overall noise in the instrument observation frequency bands was at a normal level,and the annual change pattern was not obvious;with the continuous change of seasons,the background noise level of Zhaotong station also changed correspondingly,and the high-frequency part was affected by human activities,with obvious seasonal changes changing characteristics.