Putting Japan aside for a moment...

...the NYC government's Thoughts on Terrorism is a pearler. I know crisis prevention of terrorism is a bit of an oxymoron and damn hard to troubleshoot, but there is such a thing as stating the obvious...

My personal faves:

KNOW THE FACTS AND BE RESPONSIBLE:
* Know the facts of a situation and think critically. Confirm reports using a variety of reliable sources of information, such as the government or media (hmmm, when I think of reliable sources of information they are both top of my list).
* Do not spread rumors.
* Do not accept packages from strangers and do not leave luggage or bags unattended in public areas such as the subway (easy one to follow - if you do leave them on the subway, they sure won't be there for very long).

IF YOU RECEIVE A SUSPICIOUS PACKAGE OR ENVELOPE:
* PUT IT DOWN - preferably on a stable surface.