This is Nasa’s Terra satellite’s first look at the Sendai region of Japan following the earthquake and subsequent flooding from the tsunami.
The photo on the left was captured February 26, 2011. That on the right on March 12, 2011, at 10:30 a.m. , just after the tsunami.
The after image is a little cloudy, but compare how the coastline has changed and note the scale of the map. The flood indicator on the left shows how far the flood has extended inland. MODIS also detected a plume of smoke from a fires indicated in the top right of the after photograph.