Maps of the Affected Area

The length of the damaged coastline is 420 miles (670 kilometers), roughly equivalent to the distance from Boston to Washington DC.
 Tsunami heights map (US National Oceanic and Atmospheric Administration,
At their highest point, the tsunami waves reached 131 feet (>40 m), about the height of a 10-story building
(US National Oceanic and Atmospheric Administration,
This map shows the height and travel time of the tsunami—the tsunami reached the West Coast of the US in about 9 hours, and within 20 hours, it had reached South America  
Radioactivity from Fukushima
Distribution of radiation dose around Fukushima Dai-Ichi Nuclear Power Plant, 2011–2014
(Japan Nuclear Regulation Authority,
Fukushima Evacuation Zone
Fukushima evacuation zones as of March 2013
(Japan Reconstruction Agency,
Evacuation area as of September 2015
Fukushima evacuation zones as of September 2015 (METI,