More bad news for TEPCO.

Was Shishikura certain the big one was coming?Yes, he just couldnt pinpoint precisely when it would arrive. Shishikura calculated that colliding tectonic plates under the Pacific Ocean off northeastern Japan triggered giant waves every 450 to 800 years. Historians already knew that a 25-foot tsunami had hit Sendai Bay in the year 869, sweeping more than two miles inland and stretching as far south as the site of the now-devastated Fukushima nuclear plant. Another tsunami appeared to have hit between 1300 and 1600. So Shishikura figured that the most vulnerable areas — including the city of Sendai, and Fukushima — were due to be hit by a giant wave at any time.How did he know that? He figured it out by looking at rocks.

Was there any way to predict the extent of the damage?
Yes. Japan has been hit by 195 tsunamis since the year 400. In the last three decades, there have been three waves that were more than 30 feet high. Yet Tokyo Electric’s seawall defenses at Fukushima were built to protect the nuclear reactors from waves reaching only 17 feet high. “That is ridiculous,” says Ryohei Morimoto, a retired volcanology professor at the University of Tokyo, as quoted by The Japan Times. “Even if they couldn’t predict the size of tsunami, they should have at least prepared for waves similar to those in the past.”

via The geologist who predicted Japans tsunami – The Week.