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乾陵地震台地电场日变化特征及干扰因素分析.docx

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乾陵地震台地电场日变化特征及干扰因素分析 Abstract ThediurnalvariationofthegroundelectricfieldattheQianlingSeismologicalStationwasstudied,andthefactorsthatmayinterferewiththemeasurementwereanalyzed.Theresultsshowedthatthegroundelectricfieldhassignificantdiurnalvariationcharacteristics,andtherearesomefactorsthatcancauseinterferenceinthemeasurement,suchasweatherchangesandhumanactivities.Theresearchprovidesabasisforfurtherexplorationofthemechanismofearthquakepredictionbasedonthegroundelectricfield. Introduction Thegroundelectricfieldisoneofthemainobservationparametersinearthquakepredictionresearch.TheQianlingSeismologicalStation,locatedinatectonicallyactivearea,hasbeenobservinggroundelectricfieldvariationsformanyyears.Thestudyofthediurnalvariationofthegroundelectricfieldcanprovideusefulinformationforunderstandingthephysicalmechanismsthatunderlieearthquakegenerationandcanalsobeusedtoexplorethepossibilityofusingsuchasignalasanearthquakeprecursor. ThepurposeofthisstudyistoanalyzethediurnalvariationofthegroundelectricfieldattheQianlingSeismologicalStationandtoidentifythefactorsthatcanaffectthemeasurementofthegroundelectricfield. DataAnalysis Thelogarithmicvalueofthegroundelectricfieldwasusedtoanalyzethediurnalvariation.ThedatawerecollectedfromJanuarytoDecember2018.ThedailyvariationsofthegroundelectricfieldareshowninFigure1(a),wherethebluelinerepresentsthelogarithmicvalueofthegroundelectricfieldandtheblacklinerepresentstheaveragevalue. Figure1(a)showsthatthegroundelectricfieldhasacleardiurnalvariationwiththehighestvalueoccurringataround22:00andthelowestvalueoccurringataround07:00.Thediurnalvariationpatternisstablethroughouttheyear,indicatingthatitisrelatedtothenaturalenvironmentratherthantheseason.Itishypothesizedthatthedailyvariationofthegroundelectricfieldisrelatedtotheaccumulationanddischargeofelectricchargesintheatmosphereandthegroundcausedbysolarradiationandtheearth'smagneticfield. Figure1(b)showsthattheairtemperature,relativehumidity,andatmosphericpressureallhaveasignificantimpactonthegro