Fast and accurate earthquake location within complex medium using a hybrid globallocal inversion approach-中国期刊网

摘要 Anovelhybridapproachforearthquakelocationisproposedwhichusesacombinedcoarseglobalsearchandfinelocalinversionwithaminimumsearchroutine,plusanexaminationoftherootmeansquares(RMS)errordistribution.ThemethodexploitstheadvantagesofnetworkraytracingandrobustformulationoftheFréchetderivativestosimultaneouslyupdateallpossibleinitialsourceparametersaroundmostlocalminima(includingtheglobalminimum)inthesolutionspace,andfinallytodeterminethelikelyglobalsolution.Severalsyntheticexamplesinvolvinga3-Dcomplexvelocitymodelandachallengingsource-receiverlayoutareusedtodemonstratethecapabilityofthenewly-developedmethod.Thisnewglobal-localhybridsolutiontechniquenotonlyincorporatesthesignificantbenefitsofourrecentlypublishedhypocenterdeterminationprocedureformultipleearthquakeparameters,butalsoofferstheattractivefeaturesofglobaloptimalsearchingintheRMStraveltimeerrordistribution.Unlikethetraditionalglobalsearchmethod,forexample,theMonteCarloapproach,wheremillionsoftestshavetobedonetofindthefinalglobalsolution,thenewmethodonlyconductsamatrixinversiontypelocalsearchbutdoesitmultipletimessimultaneouslythroughoutthemodelvolumetoseekaglobalsolution.ThesearchisaidedbyinspectionoftheRMSerrordistribution.Benchmarktestsagainsttwopopularapproaches,thedirectgridsearchmethodandtheoct-treeimportantsamplingmethod,indicatethatthehybridglobal-localinversionyieldscomparablelocationaccuracyandisnotsensitivetomodestlevelofnoisedata,butmoreimportantlyitofferstwo-orderofmagnitudespeed-upincomputationaleffort.Suchanimprovement,combinedwithhighaccuracy,makeitapromisinghypocenterdeterminationschemeinearthquakeearlywarning,tsunamiearlywarning,rapidhazardassessmentandemergencyresponseafterstrongearthquakeoccurrence.

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Fast and accurate earthquake location within complex medium using a hybrid globallocal inversion approach

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Fast and accurate earthquake location within complex medium using a hybrid globallocal inversion approach

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