简介：

简介：

简介：ThispapersummarizesthelayoutoftheYunnanseismicELFelectromagneticobservationnetwork,siteselection,ELFelectromagneticinstrumentsystem,dataprocessingandotherconstruction.TheprincipleandmethodofusingtheELFelectromagneticwavetechniquetomonitorandpredictearthquakesareexpounded.ThelongtermmonitoringofELFelectromagneticfieldsiscarriedoutintheYunnanearthquakepronearea,andatthesametime,thechangesinelectricalparametersandspatialelectromagneticfieldsoftheregionalcrustalmediumstructurearemonitored.Thefunctionssuchasautomatic,quasirealtime,remotemonitoring,networkmonitoring,dataprocessingspecialization,dataservice,datasharingandindustrializationoftheELFelectromagneticobservationdatahavebeenrealized.Inordertocapturethedeepelectromagneticprecursoryinformationoftheearthquakes,serviceforearthquakepredictionresearch,whichhasbroadapplicationprospectsanddevelopmentpotential.ThroughtheresearchoftheseismicityofYunnaninthetrialrunperiodoftheproject,thepreliminaryresultsoftheextremelowfrequencyelectromagneticobservationoftheYunnanearthquakeinrecentyearsaregiven.TheelectromagneticprecursorsandtheelectromagneticeffectsoftheYangbiearthquakearerecorded.Inthe3-monthperiodbeforetheearthquake,thepowerspectrumoftheelectricandmagneticfields,theapparentresistivityandtheimpedancephaseintheobservedsignalsareallabnormal,andgraduallyincreasedwithtime.Themaximumvalueisreached20daysbeforetheearthquake,andanearthquakeoccurswhenthechangeisrestoredtonormal.