Wood, M. M., Mileti, D. S., Kano, M., et al. (2011). Communicating Actionable Risk for Terrorism and Other Hazards. (Abstract only.) Risk Analysis. 32(4):601-15.
The authors propose a different approach when communicating to people when the objective is to motivate household disaster preparedness actions. Based on their study, they recommend emphasizing what to do about risk rather than sharing information about the actual risk.