The answer is Risk Communication. Risk Communication is part of a Community Disaster Education or Preparedness program. Tools to communicate the risk are Public Service annoucements, which as YuccaHead pointed out, may be part of Public Awareness Campaigns.

Mitigation is the actual acts taken to reduce the effect of a hazard. i.e. seawalls are a mitigation effort against erosion.

I would suggest checking out the "Disasters" journal, by Overseas Development Institute. I do think you need to change your search terms to include "community preparedness" or similar terms, as the actual term "risk communications" does not seem to be used alot from my research.

BTW, I'm pursuing a Master of Science in Emergency Management.