承德地区摆式仪器观测背景功率谱密度特征分析  

Analysis of Background Power Spectral Density Characteristics of Pendulum Instruments in the Chengde Area

作　　者：周硕[1] 王嘉琦 王向亮[1] 李明威[1] ZHOU Shuo;WANG Jiaqi;WANG Xiangliang;LI Mingwei(Chengde Earthquake Monitoring Center Station,Hebei Earthquake Agency,Chengde,Hebei 067000,China)

机构地区：[1]河北省地震局承德地震监测中心站,河北承德067000

出　　处：《山西地震》2024年第1期44-50,共7页Earthquake Research in Shanxi

基　　金：河北省地震局科技星火项目-攻关项目(DZ2023120800009)。

摘　　要：为获取承德地区摆式倾斜仪捕捉的地震前兆信息及仪器性能,利用功率谱密度分析方法研究3台VP型垂直摆和1台水平摆倾斜仪的噪声频谱特征。研究结果表明,正常情况下,4台仪器记录的主要背景噪声为0.2 Hz以下的低频自然环境噪声;降雨事件主要影响0.2 Hz以下的低频段;摆式仪器能较好地记录到地震波,近震为更多高频成分,远震以记录面波占主导;地震事件可导致0~0.3 Hz频段的噪声显著增加;仪器标定过程中,低频噪声会显著增加。To capture the seismic precursor information and assess the performance of pendulum inclinometers in the Chengde area,the noise spectrum characteristics of three VP-type vertical pendulums and one horizontal pendulum inclinometer were studied using power spectral density analysis methods.The study results show that under normal conditions,the main background noise recorded by the four instruments is the low-frequency natural environmental noise below 0.2Hz;rainfall events mainly affect the low-frequency band below 0.2Hz;pendulum instruments can record seismic waves well,with local earthquakes showing more high-frequency components,and distant earthquakes dominated by surface waves;seismic events can lead to a significant increase in noise in the 0-0.3Hz frequency band;during instrument calibration,low-frequency noise will significantly increase.

关 键 词：摆式倾斜仪 功率谱密度 背景噪声 

分 类 号：P315.62[天文地球—地震学]