▁work ▁in ▁building ▁up ▁the ▁German ▁Museum ▁in ▁Mun ich , ▁and ▁from ▁ 1 9 3 4 ▁he ▁was ▁a ▁member ▁of ▁its ▁Board ▁of ▁Direct ors . ▁In ▁ 1 9 3 3 ▁August ▁Sie berg ▁was ▁elected ▁a ▁member ▁of ▁the ▁Academy ▁of ▁Sciences ▁Leopold ina . ▁In ▁ 1 9 3 7 ▁he ▁became ▁an ▁honor ary ▁doctor ▁at ▁the ▁University ▁of ▁Ath ens . ▁In ▁ 1 9 3 9 ▁he ▁joined ▁the ▁Bulgar ian ▁Se ism ological ▁Service ▁in ▁Sof ia ▁as ▁an ▁external ▁member . ▁ ▁Scient ific ▁research ▁ ▁As ▁a ▁se ism ologist ▁he ▁was ▁concerned ▁with ▁the ▁compilation ▁of ▁earth qu ake ▁catalog ues ▁and ▁the ▁ge ographical ▁distribution ▁of ▁earth qu akes . ▁Further ▁fields ▁of ▁research ▁were ▁t ect on ics ▁and ▁the ▁analysis ▁of ▁macro se ism ic ▁data . ▁Sie berg ▁was ▁aware ▁that ▁the ▁nature ▁of ▁the ▁building ▁ground ▁and ▁the ▁construction ▁method ▁have ▁a ▁strong ▁influence ▁on ▁the ▁damage ▁caused ▁by ▁an ▁earth qu ake ▁and ▁was ▁very ▁interested ▁in ▁the ▁social ▁impact s ▁of ▁earth qu akes . ▁ ▁In ▁ 1 9 1 2 ▁Sie berg ▁introduced ▁the ▁twelve - deg ree ▁Mer cal li - Can can i - S ie berg ▁scale ▁as ▁an ▁improvement ▁of ▁the ▁Mer cal li - Can can i ▁scale . ▁The ▁scale ▁is ▁constructed ▁in ▁such ▁a ▁way ▁that ▁each ▁scale ▁division ▁corresponds ▁approximately ▁to ▁twice ▁the ▁horizontal ▁basic ▁acceleration ▁of ▁the ▁previous ▁one . ▁ ▁In