Previous research has shown a post-disaster increase of Gender Based Violence [GBV], suggesting a need for further investigation of the phenomena and its causes. This research draws together a wide-ranging collection of secondary data sets concerning disasters and gender based violence. It analyses the social environment in post-disaster settings that breeds an increase in GBV with focus on Sexual Gender Based Violence[SGBV] and Intra Personal Violence [IPV]. Through a comparison of two case studies: (a) post-earthquake Haiti and (b) post-hurricane Katrina.