摘要
WecomparethefactorswhichaffectthemovementofTibetanPlateaubybuildingthreetypesoffiniteelementmodels:anelasticmaterials(M-EC),acontinuousmodelcomposedbynon-linearmaterials(M-PC),andanelasticmodelwithdiscontinuousfaultmovements(M-ET).BothinM-ETandM-EC,thematerialsinQiangtangandLhasablockareelastic,andinM-ET,discontinuousmovementoffaultsisconsideredforevaluatingtheeffectsofstrike-slipfaults.InmodelM-PCDruker-PragerplasticmaterialsareusedinQiangtangandLhasablock.ComparisonsofthenumericalsimulationandtheGPSobservationsshowfollowingcharacteristics:(1)Underpresenttectonicenvironment,short-termdeformationofTibetanPlateaucanbesimulatedwellbyelasticmodels;(2)DiscontinuousfaultactivitiesincreasethelateralextrusionoftheeasternpartofTibetanPlateau,reducethestressfieldlevelinQiangtang,TarimandQaidamblocksandstrengthentheE-WextensionalforceintheeastandthewestpartsofQiangtangblock;(3)PropertiesofplasticmaterialsreducethetotalstressfieldandtheE-Wextensionalforce,thus,thenormalfaultearthquakesinsouthernTibetismainlyowedtotheeffectofactivefaultmovement.BasedonthenumericalsimulationswespeculatethatfaultsmovementmayplayamoreimportantroleonthekinematicpatternofTibetanPlateauthanbulkproperties.
出版日期
2011年02月12日（中国期刊网平台首次上网日期，不代表论文的发表时间）
