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SeismicAnalysisCode(SAC).docx
SeismicAnalysisCode(SAC)BasicDataManipulationSACSeismicAnalysisCodewasdevelopedatLawrenceLivermoreNationalLaboratoryandUniversityofCaliforniaintheearly1980s.Itisacommand-drivenprogramgenerallyimplementedonmanytypesofUNIXoperatingsystemsandhasbecomeastandarddatamanipulationtoolinseismology.Itsbinarydataformatisoneoftheprincipledataformatsusedtodayinstoringandmanipulatingseismologicaltimeseriesdata.SACwasdesignedasanaidtoresearchseismologistsinthestudyofseismicevents.Assuch,itisusedforquickpreliminaryanalyses,forroutineprocessing,fortestingnewtechniques,fordetailedresearch,andforcreatingpublicationqualitygraphics.ceri%sacSEISMICANALYSISCODE[09/04/2008(Version101.2)]Copyright1995RegentsoftheUniversityofCaliforniaSACWhatcanitdo?InteractivelyreadseismogramdataPerformmanystandarddataprocessingoperations,suchasFilteringTimepicksAmplitudepicksCorrelationFouriertransformsSeismicinstrumentcorrectionsParticlemotionrotationTraceenvelopesSpectralratiosLinearregressionsFrequency-wavenumberanalysisCreateavarietyofplotsofthedataandresultinganalysisSAC’scompetitors(analysis)VariousversionsofDATASCOPE(nowAntelope)MATSEIS/CoralotherMatlabbasedprogramsSEISANXPICKSeismicUNIXothersSAC’scompetitors (dataformat)SEED(StandardfortheExchangeofEarthquakeData)SEISAN(widelyusedinCentralandSouthAmerica/Europe)CSS(CenterforSeismicStudies,associatedwithtreatyverification)SUDS(SeismicUnifiedDataSystem,fromWillieLeePCbasedsystem/USGS)SEG-Y(thestandardforseismicreflectiondata)AH(AdHoc,pre-SEEDshowsupfromAVO/HVO,etc.inarchives)Others(newonescropupevery5-10yearstoaddressthechaoticstateofaffairs.)CommandsSACcommandsfallintothreemaincategoriesParameter-setting:changevaluesofinternalSACparametersAction-producing:performsomeoperationonthesignalscurrentlyinselectedmemorybaseduponthevaluesoftheseparametersData-set:determinewhichfilesareinactive(selected)memoryandthereforewillbeacteduponCommandsHELPcallsupalistofallcommandshelpcommandcanbeusedtoviewmanualpagesDefaultsInordertomakeSACquicktolearnandeasytouse,de
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