Here are some sources to check out and learn more information on the gender gap during natural disasters and emergencies:
http://www.lse.ac.uk/newsAndMedia/news/archives/2006/WomenAndNaturalDisasters.aspx
http://siteresources.worldbank.org/INTEAPREGTOPSOCDEV/Resources/12680GNEAPDisaster.pdf
http://www.un.org/en/globalissues/humanitarian/
http://apps.who.int/gender/other_health/disasters/en/
http://www.care.org/emergencies/women
http://www.undp.org/content/dam/undp/library/crisis%20prevention/disaster/7Disaster%20Risk%20Reduction%20-%20Gender.pdf