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营口—海城地区一维速度模型研究
Abstract
Inthispaper,wepresentaone-dimensionalvelocitymodeloftheYinkou-Haichengarea,basedontheanalysisofseismicdatacollectedfromtheregion.Weusedacombinationoftechniquesincludingreflectionseismology,tomographyandwaveforminversiontocreatethevelocitymodel.Theresultingmodelshowssignificantvariationsinsubsurfacevelocity,acrosstheregion,includingvariationsindepthandvelocityofgeologicalstructuressuchasfaults,sedimentarybasinsandtheMohodiscontinuity.
Introduction
TheYinkou-HaichengareaislocatedinthenorthernpartoftheLiaodongpeninsulainnortheasternChina.Theregionisknownforitscomplexgeologicalstructures,includingactivefaults,sedimentarybasins,andigneousintrusions.Theintrusionsandfaultsareresponsibleforthesignificantearthquakeactivityintheregion,includingthedevastatingHaichengearthquakeof1975.
Accurateknowledgeofthesubsurfacegeologicalstructuresandtheirvelocityisessentialforunderstandingtheseismicactivityandhazardsintheregionandmitigatingpotentialdisasters.Inthisstudy,wepresentaone-dimensionalvelocitymodeloftheYinkou-Haichengarea,basedonseismicdatacollectedfromtheregion.Weusedacombinationoftechniquesincludingreflectionseismology,tomography,andwaveforminversiontodeterminethesubsurfacevelocityvariations.
DataCollectionandAnalysis
Wecollectedseismicdatafromseveralseismometersplacedacrosstheregion.Weusedreflectionseismologytocollectthedata,whichinvolvedgeneratingaseismicwaveatasourceandrecordingthereflectedwavesatareceiver.Weusedthismethodtocreateareflectionprofileacrossthestudyarea.
Weanalyzedthedatausingtomography,whichisatechniqueforcreatingthree-dimensionalimagesofthesubsurfacefromseismicwaves.Weusedatomographicalgorithmtodeterminethevelocityvariationsintheregion,whichwerethenusedasastartingpointforwaveforminversion.
Waveforminversionisatechniquefordeterminingthevelocitystructureofthesubsurfacebyfittingasyntheticwaveformtotherecordeddata.Weusedawaveforminversionalgorithmtorefinethesubsurfacevelocitymodel,accountingforvariationsindepthandvelocityofgeologicalstruc