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利用ScS多次反射震相研究日本海下方地幔转换带结构.docx

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利用ScS多次反射震相研究日本海下方地幔转换带结构 Title:InvestigationoftheSubmarineMantleTransitionZoneStructureundertheSeaofJapanusingMultipleScSReflectionPhases Abstract: TheSeaofJapanisaregionofgeologicalandgeophysicalinterestduetoitscomplextectonicsetting.Oneaspectthathasintriguedresearchersisthestructureofthemantletransitionzone(MTZ)beneaththesubmarineregion.Inthisstudy,weutilizemultipleScSreflectionphasestoinvestigatetheMTZstructureandprovideinsightsintothegeodynamicprocessesoccurringbeneaththeSeaofJapan. Introduction: TheSeaofJapanischaracterizedbytheconvergenceoftheEurasianandPhilippineSeaplates,resultinginacomplextectonicenvironment.Theinteractionbetweentheseplateshasledtosubduction,magmatism,andseismicityintheregion.However,thedeeperstructureofthesubmarineMTZremainspoorlyunderstood.TheutilizationofmultipleScSreflectionphasescanprovidevaluableinformationonthecompositionandpropertiesoftheMTZ. Methodology: WeanalyzeseismicdatacollectedfrompermanentandtemporarybroadbandseismicstationslocatedaroundtheSeaofJapan.WefocusonScSphases,whicharereflectedwavesfromthecore-mantleboundary(CMB)thatre-enterthemantleandreflectofftheMTZinterfaces.BycarefullylocatingandmeasuringthetraveltimesofmultipleScSphases,wecaninfervariationsintheMTZstructure. Results: OuranalysisrevealsdistinctvariationsinthereflectionamplitudesandtraveltimesoftheScSphases,indicatinglateralvariationsintheMTZstructurebeneaththeSeaofJapan.Theobservedvariationssuggestthepresenceofpartialmelt,hydratedminerals,andcompositionalheterogeneitywithintheMTZ.Thesefindingsindicatetheinfluenceofsubduction-relatedprocessesandthepotentialformantlemodificationbeneaththeregion. Discussion: ThepresenceofpartialmeltwithintheMTZcanbeattributedtothesubductionofplatematerial,whichreleaseswaterintothemantleandlowersthesolidustemperature.ThehydrationofmantlemineralscanalsocontributetovariationsintheMTZstructure,ashydratedmineralshavedifferentseismicvelocitiescomparedtoanhydrousminerals.ThecompositionalheterogeneityobservedintheMTZcouldbeduetosubductio