甘肃地震预警测站典型异常波形的频谱分析  

Spectrum analysis of the typical abnormal waveforms of earthquake early warning stations in Gansu Province

作　　者：孙常青 朱振家 潘章容 陈晓龙 尉龙 滕举 姚赛赛 SUN Changqing;ZHU Zhenjia;PAN Zhangrong;CHEN Xiaolong;WEI Long;TENG Ju;YAO Saisai(Gansu Earthquake Agency,Lanzhou 730000,Gansu,China)

机构地区：[1]甘肃省地震局,甘肃兰州730000

出　　处：《地震工程学报》2023年第3期614-624,共11页China Earthquake Engineering Journal

基　　金：2022年度中国地震局监测、预报、科研三结合课题(3JH-202201021);甘肃省科技计划(21JR7RA797);甘肃省地震局地震科技发展基金野外站项目(KY2203008)。

摘　　要：新时期地震预警在保障人民群众生命财产安全中意义重大。近几年,国家在地震预警工程建设上投入巨大,但对于预警测站运维经验梳理总结较少。以甘肃省地震预警测站典型异常突刺的波形资料为研究对象,基于傅里叶变换对异常波形进行频谱分析,探究造成波形异常的干扰源频带范围。研究表明:波形的异常突刺优势频率为0.2~46 Hz。其中,直流电对波形产生的干扰,优势频率为0.2~15 Hz;市电对波形产生的干扰,优势频率为30~46 Hz。结果表明:市电和智能电源的输电线在与摆线并线时,市电及直流电会对波形造成干扰,形成突刺波形。研究利用频谱分析快速、准确筛查干扰源的方法,为地震预警运维工作提供了新思路。The year 2022 marks the 90th anniversary of the Changma earthquake.Earthquake early warning plays an increasingly important role in protecting people’s life and property safety.In recent years,China has invested in the construction of earthquake early warning projects;however,the experience of early warning operation and maintenance is poorly summarized.In this work,the waveform data of typical abnormal spikes from earthquake early warning stations in Gansu Province were taken as the research object,and the spectrum analysis of abnormal waveforms was carried out through Fourier transform to explore the frequency band range of interference sources causing abnormal waveforms.Results show that the dominant frequency of abnormal spike waveform is 0.2-46 Hz.In particular,the dominant frequency of the direct current’s interference on the waveform is 0.2-15 Hz,and that of the mains supply is 30-46 Hz.When the transmission lines of the mains supply and intelligent power supply are connected to the cycloid,the main supply and direct current cause interference with the waveform,thus forming a spike waveform.This study used the spectrum analysis method to quickly and accurately screen interference sources,providing a new idea for the operation and maintenance of earthquake early warning.

关 键 词：异常波形 预警运维 傅里叶变换 优势频率 

分 类 号：P315.7[天文地球—地震学]