北武当观测站洞体形变观测功率谱密度特征分析  

Analysis of power spectral density characteristics of cave deformation observation at Beiwudang Observation Station

作　　者：高翠珍[1,2] 王晓霞[1,2] 孟彩菊[1,2] 薛锦明[1,2] 薛生瑞 GAO Cuizhen;WANG Xiaoxia;MENG Caiju;XUE Jinming;XUE Shengrui(Taiyuan Earthquake Monitoring Center Station,Shanxi Province 030021,China;National Continental Rift Valley Dynamics Observatory of Taiyuan,Shanxi Province 030021,China)

机构地区：[1]山西省地震局太原地震监测中心站,山西030021 [2]太原大陆裂谷动力学国家野外科学观测研究站,山西030021

出　　处：《地震地磁观测与研究》2023年第6期86-92,共7页Seismological and Geomagnetic Observation and Research

基　　金：中国地震局地震监测、预报、研究三结合课题(项目编号:3JH-202301010);山西省地震局青年项目(项目编号:SBK-2112)。

摘　　要：选取山西省北武当地震观测站洞体形变测项正常时段及干扰时段的观测数据,计算功率谱密度(PSD),分析洞体形变数据的正常背景特征和不同干扰下对应PSD值的变化特点。结果表明:(1)无干扰:正常背景下,观测数据每日PSD值变化不大,可反映最大频率为8.3×10^(-3)Hz的PSD分布;(2)曲线加粗:在10^(-3)Hz以上频段,干扰日PSD值增大,表现为高频干扰;(3)台阶、突跳和畸变:PSD值全频段明显增大;(4)趋势改变:PSD值变化不大;(5)地震波:随着同震效应增大,PSD值频段范围和变化幅度增大。Select the observation data of the normal and interference periods of the cave deformation measurement items from the Beiwudang Seismic Observation Station in Shanxi Province,calculate the power spectral density(PSD),and analyze the normal background characteristics of the cave deformation data and the corresponding changes in PSD values under different interferences.The results show that:①No interference:Under normal background,the daily PSD value of the observed data does not change much,which can reflect the PSD distribution with a maximum frequency of up to 8.3×10^(-3) Hz;②Bold curve:The PSD value of the interference day increases in the frequency band above 10^(-3) Hz,manifested as high-frequency interference;③Steps,jumps,and distortions:PSD values significantly increase across the entire frequency range;④Trend change:PSD value does not change significantly;⑤Seismic waves:As the coseismic effect increases,the frequency range and amplitude of PSD values increase.

关 键 词：洞体形变 功率谱密度 背景噪声 干扰 

分 类 号：P315.7[天文地球—地震学]