Scientists say some reactors in Japan appear to have been built directly above active earthquake faults.

科学家说，日本的一些反应堆似乎直接建在活跃的地震断层上方。

At the scale of millennia, this allows us to make predictions about when highly active faults, like the San Andreas, are overdue for a massive earthquake.

以千年为单位，我们可以预测断层活跃高发期，例如，圣安德烈亚斯的大地震已经迟到很久了。

Geologists got rock cores from two miles down, at the active fault zone. They looked at those fault rocks with an electron microscope. And they found an incredibly thin coating of clay polish on the rocks.

地质学家们在断层带活跃区域的两英里深处采集了岩心样本，他们利用电子显微镜研究那些断层岩，发现这些岩石上覆盖着极薄的一层粘土" 抛光蜡" 。