An earthquake in Oregon ... but when?

(July 28, 2018) - Oregon, Washington and California will have a big earthquake, say scientists. They don't know when. Sooner or later, it will be "the big one," they say.

The ground is going to shake strongly. The immense earthquake will make a tsunami. A tsunami is a very large wave of water. It will reach the shore in 15 minutes. There will be much damage.

However, the land in the three states is different. There is more danger for the coast between Portland and Seattle. The last large earthquake was in 1700. No one knows when it is going to happen again. It can be this year or more than 100 years from now.