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1、GEOPHYSICALRESEARCHLETTERS,VOL.31,L01607,doi:10.1029/2003GL018827,2004TowardmappingsurfacedeformationinthreedimensionsusingInSAR112TimJ.Wright,BarryE.Parsons,andZhongLuReceived12October2003;revised25November2003;accepted28November2003;published14Janu
2、ary2004.[1]OneofthelimitationsofdeformationmeasurementsplannedandproposedSARmissions,anddiscussthemadewithinterferometricsyntheticapertureradar(InSAR)implicationsforfutureimageacquisitionstrategies.isthataninterferogramonlymeasuresonecomponentof[3]In
3、addition,weattempttoresolvethe3Dsurfacethesurfacedeformation—inthesatellite’slineofsight.Wedisplacementsforthe23October2002,NenanaMountaininvestigatestrategiesformappingsurfacedeformationin(Alaska)earthquake,whichtoourknowledgeisthefirstthreedimensio
4、nsbyusingmultipleinterferograms,withearthquakeforwhichinterferogramswith4differentview-differentimaginggeometries.Geometriesforbothcurrentinggeometrieshavebeenacquiredintheepicentralarea.andfuturemissionsareevaluated,andtheirabilitiestoOneimportantqu
5、estioniswhether3Ddisplacementsareresolvethedisplacementvectorarecompared.Thenorthnecessary.Weinvestigatewhetherthedeterminationofcomponentisalwaysthemostdifficulttodetermineusingsimpleearthquakemodelsisimprovedbytheuseofdatafromnear-polarorbitingsate
6、llites.However,asatelliteinterferogramswithmorethan2viewinggeometries.withaninclinationofabout60°/120°wouldenableallthreecomponentstobewellresolved.Weattempttoresolvethe3Ddisplacementsforthe23October2002Nenana2.Determining3DDisplacementsMountain(Alas
7、ka)Earthquake.Thenorthcomponent’s[4]Beforedetermining3Ddisplacements,itisnecessaryerrorismuchlargerthanthesignal,butproxiesfortodetrendalltheinterferograms,removingorbitalerrors,eastwardandverticalmotioncanbedeterminediftheandtodetermineareferencepha
8、selevel.Inmanycases,northcomponentisassumednegligible.Inversionsofthiscanbedoneusingdatainthefarfieldofthehypotheticalcoseismicinterferogramsdemonstratethatinterferogram,awayfromthedeformingarea.Intheearthquakemodelparameterscanbewellrecoveredfromsub
