强地震动随机合成中震源谱模型的改进

《强地震动随机合成中震源谱模型的改进》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、哈尔滨工业大学工学硕士学位论文尺寸依赖性的改善没有明显影响，对合成的地震动幅值与实际记录的符合程度不但没有负面影响，还有所改善。关键词：震源谱模型；近场地震动场；随机合成；标准化因子；拐角频率-II-哈尔滨工业大学工学硕士学位论文AbstractStronggroundmotionsarethemaincauseofdamageandcollapseofbuildings.Theresearchofnear-fieldgroundmotionsinvolvesseriesoffundamentalscientificproblemsi

2、nseismologyincludingtheknowledgeandunderstandingofthesource,seismicwavepropagationinthemedium,theimpactoflocalsiteconditions.Theimpactofsourceisemphasisinthesethreeaspects.Currentconsensusisthatthestochasticsynthesismethodisthemainapproachforthehighfrequencygroundmotion

3、ssimulation.Basedonhybridsourcemodeloffinitefault,thispaperresearchesoneimprovementforsourcespectralmodelinstochasticsynthesis.ThispaperfirstintroducestheimprovementoftheMasudasourcespectra,andthecornerfrequencyofsub-sourceisdeterminedbyitsseismicmomentassignedasthedist

4、ributionofslip.Thismodelcancharacterizetheinfluenceofheterogeneousdistributionofsliptofrequencyspectrumcharacteristics,especiallythebarrier’sdominantroleinhighfrequencyseismicwave.Meanwhile,itcanexpressthevariationoffrequencycomponentofseismicwaveduringruptureprocess.As

5、rupturecontinues,thenumberofcrackedsub-sourcesincreasesandtwoparametersinsourcespectramodelisalsochanged.Thisimprovementisequaltotheeffectofmodifiedcornerfrequencyofeachsub-sourceproposedbyCanadianscholars,whichcaneliminatetheseismicamplitude’sdependenceonthedimensionso

6、fsub-sources.However,thereisthelittlerelationshipbetweencornerfrequencyandtheslipofsub-sourcesinCanadianscholars’evolutionarymodel,andthelattercrackedsub-sourcesalwayshavelowercornerfrequencythanformersub-sourcessoastothelastcrackedsub-sourceachievesthelowestcornerfrequ

7、encyonthewholefaultplane.Ourimprovementcanavoidtheseunreasonablesituationsabove.Thispaperfurthermakesresearchesoninfluenceofourimprovementtofar-fieldradiationenergyandindicatesthatthevariationoftheshapeoffar-fieldradiationenergycurveunderdifferentsub-sourcesizesisalsore

8、asonable.Thatistosay,asthedimensionsofsub-sourcesincrease,thehighfrequencycomponentspartinradiationenergydecre