摘要
Weaddresstheroleoftheconcaveandconvexarcs(asobservedfromthesubductingplate)onthedeformationoccurringalongtheMyanmar-Andaman-Sumatramargin.Wecategorizethepre-andpost-seismicdeformationsofthelithosphereusingearthquakedatabaseoccurringeitherpriorto26thDecember2004M_w9.3off-Sumatramega-eventoraftertheincidence.Analysisunderpre-seismicdomainshowsthatareanearSumatrarecordshighestseismicity,whichlargelydropsintheareapasttheNorthAndaman,andfurtherincreasestowardsnorth.Shallowestdepthandminimumdipofthesubductinglithosphereisrecordedatthecentralsegmentwherethearctransformedintoconcaveshape.TheannualmomentenergyreleaseduringearthquakedecreasestomorethantwoordersofmagnitudepasttheNorthAndamantowardsnorthunderpost-seismicdeformationphase.HigherdepthsofcontinuityofeventsarepresumablyassociatedwithmoredippingBenioffzonesinboththeIndo-MyanmarandAndaman-Nicobarconvexarcs.Theseobservationsobviouslyaccountfortectonicsubdivisionofthemarginnearconcaveshapearcaroundthecentralpart.Absenceofvolcanism,presenceofsplayfaultsintheback-arc,sharpreductioninseismicitynearcentralsegmentareinterpretedtobecausedbymajortectonicimpactoftheNNE-wardconvergingbuoyantNinety-eastRidgeagainsttheAsianPlate.Shallowestdip,smallelasticthickness,weakconvergingIndianlithosphere,andevidencesofseriesofen-echelonblocksofftheeasternsideofthebrokennorthernNinetyeastRidgemightbeincapableofgeneratinggreatearthquakeinthisarea.
出版日期
2017年04月14日（中国期刊网平台首次上网日期，不代表论文的发表时间）
