It appears that the first sign came in the form of a magnitude 7.2 earthquake off the coast of Japan, just before 12pm, 9th of March.
1. Did we have early warning system to pick up that signal (from the first seismic activity)?
2. When the the government know about this?
3. Was potentially affective population warned?
4. When was the first evacuation notice announced?
5. Was death preventable?
6. Can we prevent this next time?
(Found on Reddit)