4 . ▁( The ▁ 1 9 8 9 ▁L oma ▁Pri eta ▁earth qu ake ▁that ▁shook ▁San ▁Francisco ▁was ▁magnitude ▁ 6 . 9 .) ▁ ▁The ▁Rich ter ▁scale ▁was ▁published ▁in ▁ 1 9 3 5 ▁and ▁immediately ▁became ▁the ▁standard ▁measure ▁of ▁earth qu ake ▁intensity . ▁Rich ter ▁did ▁not ▁seem ▁concerned ▁that ▁G uten berg ' s ▁name ▁was ▁not ▁included ▁at ▁first ; ▁but ▁in ▁later ▁years , ▁after ▁G uten berg ▁was ▁already ▁dead , ▁Rich ter ▁began ▁to ▁ins ist ▁for ▁his ▁colle ague ▁to ▁be ▁recognized ▁for ▁expand ing ▁the ▁scale ▁to ▁apply ▁to ▁earth qu akes ▁all ▁over ▁the ▁glo be , ▁not ▁just ▁in ▁southern ▁California . ▁Since ▁ 1 9 3 5 , ▁several ▁other ▁magnitude ▁scales ▁have ▁been ▁developed . ▁ ▁Personal ▁life ▁Rich ter ▁was ▁an ▁active ▁and ▁av owed ▁natur ist . ▁He ▁travel led ▁to ▁many ▁n ud ist ▁communities ▁with ▁his ▁wife . ▁▁ ▁states ▁Rich ter ▁was ▁an ▁at he ist , ▁but ▁she ▁also ▁quotes ▁a ▁Robert ▁Kauf man ' s ▁letter ▁to ▁the ▁New ▁York ▁Times ▁which ▁stated ▁that ▁Rich ter ▁was ▁a ▁member ▁of ▁Kauf man ' s ▁con greg ation . ▁ ▁At ▁his ▁ret irement ▁party , ▁a ▁group ▁of ▁colle agues ▁at ▁Cal tech , ▁called ▁the ▁" Qu id n un cs ," ▁played ▁and ▁sang ▁a ▁d itt y ▁titled ▁" R ichter ▁Sc ale ," ▁which ▁gave ▁examples ▁of ▁earth qu akes ▁in ▁American