ActiveTectonicRegionsGSC350NaturalDisasters3typesoftectonicboundariesBoundaryType Divergent Convergent TransformMotion SpreadingSubduction/(collision)LateralslidingLithospheric Effect Constructive Destructive ConservativeTopography Ridge/Rift Trench GenerallynoneVolcanicActivity? Yes Yes NoGSC350NaturalDisastersGSC350NaturalDisastersEastPacificRise StretchesfromAntarcticatoSaltonSea Eachsidemovesawayfromtheridgeat~7.5cm/yr Newcrustformedatthisrate Oceaniccrustiswarmnearridge,coolswithdistanceDivergentBoundaryGSC350NaturalDisastersDivergentBoundaryGSC350NaturalDisastersEastAfricanRift StretchesfromRedseatoMozambique SplittingAfricanplateintotwonewones EventuallymaybecomeanoceanGSC350NaturalDisastersDivergentBoundaryGSC350NaturalDisastersDivergentBoundaryGSC350NaturalDisastersGSC350NaturalDisastersCostaRica Subductionzone(oneplatesubductingunderanother)~9cmperyear Largeearthquakesandvolcanicactivity(duetomeltingofsubductingplate) PartoftheringoffireConvergent BoundaryGSC350NaturalDisastersConvergent BoundaryGSC350NaturalDisastersSouthSandwichTrench Subductionofoceaniccrustunderoceaniccrust Createsearthquakesandvolcanoes Volcanoesexistasislandsthattracealongthearc 600milesinlength Convergesat~7cm/yrGSC350NaturalDisastersConvergent BoundaryGSC350NaturalDisastersConvergent BoundaryGSC350NaturalDisastersMidOceanRidges ExistasboundariesalongsegmentedspreadingcentersGSC350NaturalDisastersTransform BoundaryGSC350NaturalDisastersTransformBoundaryGSC350NaturalDisastersNewZealand(SouthIsland) AlpineFault(NewZealandsSanAndreas) Platesmoveinarightlateralmotionat~35mm/yr TransitionalsegmentofboundarybetweensubductionzonesGSC350NaturalDisastersTransform BoundaryGSC350NaturalDisastersTransform BoundaryGSC350NaturalDisastersNexttime Earthquakes