ong ▁Put ik , ▁Pas ong ▁T amo , ▁P ug ad ▁La win , ▁San ▁Bart ol ome , ▁and ▁Tal ip apa , ▁which ▁belonged ▁to ▁Nov al ich es ▁and ▁had ▁a ▁combined ▁area ▁of ▁about ▁ 8 , 1 0 0 ▁hect ares , ▁were ▁taken ▁from ▁Cal o oc an ▁and ▁c eded ▁to ▁Que zon ▁City . ▁This ▁caused ▁the ▁territorial ▁division ▁of ▁Cal o oc an ▁into ▁two ▁non - cont igu ous ▁parts , ▁the ▁South ▁section ▁being ▁the ▁more ▁urban ized ▁part , ▁and ▁the ▁North ▁half ▁being ▁sub - r ural . ▁On ▁June ▁ 1 6 , ▁ 1 9 5 0 , ▁the ▁Que zon ▁City ▁Char ter ▁was ▁re vised ▁by ▁Republic ▁Act ▁No . ▁ 5 3 7 , ▁changing ▁the ▁city ' s ▁boundaries ▁to ▁an ▁area ▁of ▁. ▁Ex actly ▁six ▁years ▁after ▁on ▁June ▁ 1 6 , ▁ 1 9 5 6 , ▁more ▁revis ions ▁to ▁the ▁city ' s ▁land ▁area ▁were ▁made ▁by ▁Republic ▁Act ▁No . ▁ 1 5 7 5 , ▁which ▁defined ▁its ▁area ▁as ▁. ▁According ▁to ▁the ▁Philipp ine ▁Institute ▁of ▁Vol can ology ▁and ▁Se ism ology ▁and ▁Ge os cience ▁Australia ▁on ▁their ▁study ▁earth qu ake ▁impact ▁and ▁risk ▁assess ment ▁on ▁the ▁Gre ater ▁Metropolitan ▁Man ila ▁Area , ▁the ▁total ▁area ▁of ▁Que zon ▁City ▁stood ▁at ▁. ▁ ▁On ▁October ▁ 1 , ▁ 1 9 7 5 , ▁Que zon