▁floor ▁only ▁in ▁a ▁few ▁cases ▁as ▁the ▁descent ▁down ▁the ▁ste ep ▁wall ▁is ▁difficult ▁and ▁dangerous , ▁subject ▁to ▁earth qu akes , ▁land sl ides ▁and ▁rock falls . ▁Moreover , ▁only ▁relatively ▁short ▁stays ▁on ▁the ▁cal der a ▁floor ▁had ▁been ▁possible ▁due ▁to ▁log ist ical ▁problems , ▁so ▁that ▁extensive ▁studies ▁had ▁been ▁impossible . ▁The ▁investigation ▁program ▁of ▁Ge ores earch ▁Vol can edo ▁on ▁the ▁cal der a ▁floor ▁included ▁research ing ▁the ▁visible ▁effects ▁of ▁smaller ▁er u ptions ▁which ▁had ▁taken ▁place ▁since ▁ 1 8 1 5 , ▁gas ▁measurements , ▁studies ▁of ▁fl ora ▁and ▁fa una ▁and ▁measurement ▁of ▁weather ▁data . ▁Es pecially ▁striking ▁was ▁the ▁relatively ▁high ▁activity ▁of ▁D oro ▁Api ▁To i ▁(" G un ung ▁Api ▁K ec il " ▁means ▁" small ▁vol cano ") ▁in ▁the ▁southern ▁part ▁of ▁the ▁cal der a ▁and ▁the ▁g ases ▁esc aping ▁under ▁high ▁pressure ▁on ▁the ▁lower ▁north - east ▁wall . ▁Besides ▁the ▁team ▁discovered ▁near ▁the ▁D oro ▁Api ▁To i ▁a ▁lav ad ome ▁which ▁had ▁not ▁yet ▁been ▁mentioned ▁in ▁scientific ▁studies . ▁The ▁team ▁called ▁this ▁new ▁discovery ▁" Ad ik ▁Api ▁To i ▁( Ind ones ian ▁" ad ik ": ▁younger ▁brother ). ▁Later ▁this ▁lav ad ome ▁was ▁called ▁by ▁the ▁Indones ians ▁" D oro ▁Api ▁Bou " ▁(" new ▁vol cano "). ▁This ▁lav ad ome ▁probably ▁appeared ▁in ▁ 2 0 1 1