内蒙古东部预警基准站同台测震与强震背景噪声特征  

Background Noise Characteristics of Seismological Observation and StrongEarthquake of Early Warning Reference Stations in Eastern Inner Mongolia

作　　者：郭延杰 安全[2] 包莹 冯超 王玥 GUO Yanjie;AN Quan;BAO Ying;FENG Chao;WANG Yue(Chifeng Earthquake Monitoring Center Station of Earthquake Agency of Inner Mongolia Autonomous Region,Chifeng 024000,China;Earthquake Agency of Inner Mongolia Autonomous Region,Hohhot 010010,China;Hohhot Earthquake Monitoring Center Station of Earthquake Agency of Inner Mongolia Autonomous Region,Huimin District,Hohhot 010010,China)

机构地区：[1]内蒙古自治区赤峰地震监测中心站,内蒙古自治区赤峰市024000 [2]内蒙古自治区地震局,呼和浩特市010010 [3]内蒙古自治区呼和浩特地震监测中心站,呼和浩特市010010

出　　处：《大地测量与地球动力学》2023年第7期761-766,共6页Journal of Geodesy and Geodynamics

基　　金：中国地震局“三结合”课题(3JH-202201045);内蒙古自治区地震局局长基金(2021JC12)。

摘　　要：对内蒙古东部地区不同区域5个预警基准站同台测震和强震在2022-06的连续波形数据进行背景噪声特征分析。结果表明,5个预警基准站测震的RMS值均低于强震,且RMS值在30 d内变化不大,背景噪声源较为稳定。各基准站测震与强震1~20 Hz频带内各频点噪声功率谱均受人为活动影响,呈现较强的规律性,主要体现在大于2 Hz频段。对比功率谱密度(PSD)概率密度函数(PDF)分布发现,强震在记录小于10~(-1) Hz噪声信号时不可靠,且在14 Hz左右的峰值频段会受近场干扰影响。This paper analyzes the background noise characteristics of continuous waveform data of seismological observation and strong earthquake of five early warning reference stations at different regions in eastern Inner Mongolia in June 2022.The results show that the RMS values of seismological observation at five stations are all lower than those of the strong earthquake,the RMS values changed little within 30 days,and the background noise source is relatively stable.The noise power spectrum of each frequency point at 1 to 20 Hz frequency band of seismological observation and strong earthquake of each reference station is affected by human activities,showing a strong regularity,mainly reflected in the frequency band greater than 2 Hz.Based on the comparison of PSD probability density function distribution,the strong earthquake is unreliable when the recording noise signal is less than 10-1 Hz,and the peak frequency band around 14 Hz is affected by near-field interference.

关 键 词：预警基准站 测震 强震 背景噪声 PSD 

分 类 号：P315[天文地球—地震学]