起伏地表?xiàng)l件下地震波傳播數(shù)值模擬.pdf

1、同濟(jì)大學(xué)海洋與地球科學(xué)學(xué)院碩士學(xué)位論文起伏地表?xiàng)l件下地震波傳播數(shù)值模擬姓名：吳曉豐申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：固體地球物理學(xué)指導(dǎo)教師：董良國(guó)20060201AbstractAbstractSeismicexplorationinhillyareaisaworldwideproblem，inwhichlowS／Nratioandstaticcorrection，deducedtosurfacetopographyarethemostnotor

2、iousproblemsComplextopographygiveschallengetogeophysicistsThisthesisaimstothemodelingofthepropagationofelasticwavesinthepresenceoftopographypresentingtheeffectsoftheirregularsurfaceonthepropagationofthewaves，andgivingath

3、eoreticalguidetoseismicexplorationinhiHyareaThemostdifficultpointforsimulationofsurfacewithtopographyisthefreesurfaceconditionsandthewayofcarryingthemoutThefinitedifference(FD)hasbeenwidelyusedinthesimulationofseismicwav

4、es，especiallyinthesimulationofseismicwavdincomplexmodel，andthefinitedifference(FD)isveiyefficiencyButthemostinfluencedisadvantageisthatitishardforthefinitedifference(FD)todealwiththesurfacewithtopographyHowtousethefinite

5、difference(FD)approachtosimulatetheelasticwavepropagationwithtopographybecomesthebiggestproblemInthispaperalineofpseudo—pointsisaddedabovethetopographytoimplementthefreesurfaceboundaryconditionsAftertheanalysisaboutallki

6、ndsofthesenodes，thewholespaceisdividedto22types，whichhavedifferentfinitedifference(D)schemesByusingthisapproach，finitedifference(FD)methodcanbeusedtosimulatetheelasticwavepropagationinthepresenceoftopographyNumericalmode

7、lingresultsshowthatthetopographycomplicatesthepropagationofseismicwavesinnearsurfaceItleadstotheconversionofdifferentwavessuchassurfacewaveandbodywaveaswellasgenerationofscatteringalongsurfaceThisseverelydeterioratestheS