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ESCI444-ExplorationGeophysicsIReflectionSeismicDataProcessinSteveH.Danbom,Ph.D.AdjunctProfessorOffice-Room205BOfficeHours–Thursday1-3LectureWeek2–WaveinteractionwithboundariesSpring,2003
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Multiple-exposuresnapshotshowingpropagationsequenceoffirstarrivalenergyforacrosssection.
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SchematicofSnell’sLawshowingbothraypathsandwavefronforasimple,pre-criticalvelocitymodel.
Snell’sLawforincidentP-wavesandS-waves
Fermat’sLeast-TimePrincipleAlightraytravelingfromonepointtoanotherwillfolapathsuchthat,comparedwithnearbypaths,thetimerequirediseitheraminimumoramaximumorwillremainunchanged(it[theray]willremainstationary).
UsingFermat’sLeast-TimePrincipletodemonstratethecorrectnessofSnell’sLaw.
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Demonstrationofthenormalincidentreflectionandtransmiscoefficientsacrossaboundaryofacousticimpedancechange.
Demonstrationofthetransmissionandreflectioncoefficieformodelshavingavelocitycontrastoradensitycontrast
Isthisright???
Fortransmissionloss,thereturnamplitudeisafunctionofaoftheinterfacesalongtheraypathandaccountsforthe“sig
FirstFresnelzonedefinedbytheupperpartoffigure(A);frequencyvariabilityofFresnelzonesindicatedbylowerpar
SchematicoffirstFresnelZoneshowingsphericalwavefroofseismicwaveimpingingonacousticimpedanceboundary.
NomogramfordeterminingfirstFresnelzoneradius.
LateralresolutionissuessurroundingFresnelZones.
Snapshotofpropagatingwavetimetlaterafteraplanewavehitthecornerofthesemi-infinatebarriershown.
Seismogramofthreedifferentinfiniteboundaryterminatinotedi
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