宍仓正展说，这个地区似乎每400到600年就发生一次大海啸，最近的一次发生在1707年。

Shishikura says large tsunamis appear to hit there every 400 to 600 years, with the most recent in 1707.

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这些粗略的计算说明，发生大海啸的危险至少是一个世纪过后的事情。但宍仓正展说，我们最好是注意一下。

Those rough calculations suggest the danger is at least a century away. Still, Dr. Shishikura says, 'we had better be on the lookout. '

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宍仓正展的老板冈村行信（Yukinobu Okamura）甚至早在2009年一个官方委员会召开的讨论核电站安全性会议上就提到过上述研究成果。

Dr. Shishikura's boss at the center, Yukinobu Okamura, had even mentioned the results at a 2009 meeting of an official committee discussing the safety of nuclear-power plants.

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