How much of Japan was destroyed by the 2011 tsunami?

The 2011 Tsunami in JapanMost scientists reported that the 33ft (10m) Tsunami wave, triggered by a massive earthquake on March 11 measuring magnitude 9.0 on the Richter scale, made it 6 miles (10 kilometers) inland with washed up debris and water reaching distances of 10 miles or more inland.

This city of Sendai was 80 miles (128 km) from epicenter of Earthquake.