This image shows that a large section of Japan's Honshu island (the main part of Japan) has twisted toward the east
, relative to the rest of the country:
The March 12 earthquake, now determined to be a 9.0, did a great deal of damage -- and then much more in the tsunami immediately following. The arrows are run together, unfortunately, in the middle section -- but they indicate a move of more than two meters (about eight feet) in the central area.
The two nuclear plants most in the news are right on the coast:
While it may have seemed foolish to locate nuclear power plants on a shore subject to tsunamis, at least these had access to seawater for emergency cooling.
There are lots of details here with lots of discussion of those plants and resources.
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