TurkishJournalofEarthSciences (TurkishJ.EarthSci.),Vol.12, 2003,pp.5-46. Copyright©TÜB‹TAK KinematicsoftheMiddleEastandEastern MediterraneanUpdated ROBWESTAWAY 16NevilleSquare,DurhamDH13PY,ENGLAND (e-mail:
[email protected]) Abstract: Arevisedquantitative,internallyconsistent,kinematicmodelhasbeendeterminedforthepresent-day relativeplatemotionsintheeasternMediterraneanandMiddleEasternregions,basedonacombinationof geologicalandGPSdata.TherelativemotionsofthebrittleuppercrustoftheAfricanandArabianplatesacross thesouthernDeadSeaFaultZone(DSFZ)arerepresentedbyrelativerotationat0.278°Ma-1 aboutanEulerpole at31.1°N26.7°E.TheresultingpredictedsliprateonthesouthernDSFZis4.0mma -1.Thekinematicsofthe northernDSFZaredescribedasrelativerotationat0.243°Ma -1 aboutthesameEulerpole,thedifferencein rotationratesreflectingtheabsorptionofasmallcomponentoftherelativemotionbydistributedshorteningin thePalmyrafoldbelt.ThenorthernDSFZ,inSyriaandsouthernTurkey,isregardedasaseriesoftranspressional stepovers,alongwhichtherateofleft-lateralslipissubstantiallylessthantherateofrelativeplatemotion,because thisslipisorientedstronglyobliquelytotherelativemotionbetweentheadjoiningplates.Thisgeometryseemsto resultinpartfromsomestrandsofthenorthernDSFZreactivatingolderfaultsegments,eventhoughtheywere notoptimallyorientedrelativetotheplatemotion,andinpartbecausetheidealinitialgeometryoftheDSFZ, whichwouldhavecontinuednorthwestwardoffshoreoftheLevantcoastlinetowardsCyprus,wasprecludedby thehighstrengthofthecrustalongthisline.TherevisedsliprateontheEastAnatolianFaultZone(EAFZ)is