简介：Itisfoundbyfieldinvestigationthatthenearhorizontaltopsurfaceofthebrownorbrick-redhydrothermalalterationzonevariesobviouslyinelevationatdifferentsectionsofthesamelayeronthecaldera'sinnerwallofTianchi,withthatatthenorthsectionneartheTianwenPeakabout110mhigherthanthatatthesouthneartheJiangjunPeakinKorea.Thetopsurfaceofthehydrothermalalterationzonecanbetakenaskeyhorizontotectonicmovement.ThedifferenceindicatesthatthetotalupliftheightoftheNWwalloftheLiudaogou-TianchiJingfengshanfault,theprincipalfaulttrendingNEatTianchi,isbiggerthanthatoftheSEwalleversincetheoccurrenceofhydrothermalalteration.ThisalsoexplainswhythetopographyinthenorthwestsideofTianchiissteeperandwithmoredevelopedriversystemthaninthesoutheast.TheupliftingofthenortheasternwallisbiggerthanthatofthesouthwestalongtheprincipalNW-trendfault,namely,theBaishanzhen-Tianchi-Jincefault.Itisobservedfromcharactersofhydrothermalalterationandthepalaeoresiduum,thattherecentverticalmovementratealongtheprincipalNE-trendfaultislargerthanthatoftheprincipalNW-trendfault.ThetwofaultsintersectatTianchi,dividingthevolcanointo4blocks,withtheupliftmagnitudesdecreasingsuccessivelyintheorderofthenorth,thewest,theeastandthesouthblock.ThebiggestupliftofthenorthblockcorrespondswelltotheshallowmagmabatchinthenorthofTianchiobservedbyDSSandtelluricelectromagneticsounding,andetc.andtheymayberelatedwiththecauses.