ety ▁homes ▁were ▁destroyed ▁and ▁property ▁damage ▁was ▁$ 1 0 ▁million ▁( 1 9 5 2 ▁rate ). ▁ ▁A ▁magnitude ▁ 6 . 1 ▁earth qu ake ▁struck ▁off ▁the ▁south ▁coast ▁of ▁H ok ka ido , ▁Japan ▁on ▁August ▁ 3 1 ▁at ▁a ▁depth ▁of ▁ 6 3 . 9   km . ▁ ▁September ▁▁▁ ▁A ▁magnitude ▁ 6 . 7 ▁earth qu ake ▁struck ▁off ▁the ▁west ▁coast ▁of ▁Costa ▁Rica ▁on ▁September ▁ 9 ▁at ▁a ▁depth ▁of ▁ 1 5 . 0   km . ▁ ▁A ▁magnitude ▁ 6 . 0 ▁earth qu ake ▁struck ▁southern ▁Q ing hai ▁Province , ▁China ▁on ▁September ▁ 1 4 ▁at ▁a ▁depth ▁of ▁ 1 5 . 0   km . ▁ ▁A ▁magnitude ▁ 6 . 1 ▁earth qu ake ▁struck ▁south west ▁of ▁B oug ain ville ▁Island , ▁Pap ua ▁New ▁Guinea ▁on ▁September ▁ 1 9 ▁at ▁a ▁depth ▁of ▁ 6 4 . 0   km . ▁ ▁A ▁magnitude ▁ 7 . 1 ▁earth qu ake ▁struck ▁Ju ju y ▁Province , ▁Argentina ▁on ▁September ▁ 2 1 ▁at ▁a ▁depth ▁of ▁ 2 6 8 . 0   km . ▁ ▁A ▁magnitude ▁ 6 . 0 ▁earth qu ake ▁struck ▁the ▁coast ▁of ▁northern ▁California ▁on ▁September ▁ 2 2 ▁at ▁a ▁depth ▁of ▁ 1 5 . 0   km . ▁ ▁A ▁magnitude ▁ 6 . 2 ▁earth qu ake ▁struck ▁off ▁the ▁southern ▁tip