简介：Platemotionisoneofthemajordynamicsourcesfordeformationinthecrustandthemantle.SincethedeformationinthecrustcanbeobservedbyGPSandgeologicalobservation,thecomparisonbetweenthedeformationofthecrustandthatofthemantlebecomesoneofthemajormethodsavailableforstudyingthecouplingbetweencrustmovementandmantledeformation.RegionalcrustalstrainratetensorvaluesinChina,inferredfromQuaternaryfaultslipratesandearthquakedeformationdatawithinareasofapproximately200×200km,areinterpolatedwithsmooth,continuousfunctions(spline)todetermineaself-consistentmodelvelocitygradienttensorfieldforthepresent-dayChinesecontinent.Intheinterpolationprocess,GPSvelocityvectorsarealsomatched,withinadefinedframeofreference,bythemodelvelocityfield.Thedirectionsofsheardeformationcalculatedfromthemodelvelocityfieldarecomparedwiththefastdirectionsofshear-wavesplittinginferredfromSKSphasesandPnwaves.Theresultsmightrepresentthesheardeformationinmantleandthedeepcrust,respectively.Thereisarelativelylargedifferencebetweentheaveragedirectionofcrustalshearandthatofmantleshearintheareaofactivetectonics,whichmayindicatethatintheseactiveareasthecrustandthemantlemaybedecoupled.