Emergency services are already preparing for how to deal with a terrible off-shore earthquake in the Cascadia Subduction Zone, off the west coast of America near California.
They were just completing their four-day major emergency test run when a 5.2 magnitude quake hit Borrego Springs, San Diego County, in California on Friday.
The mid-sized earthquake caused more than 200 aftershocks – some more than three on the richter scale - and could be felt from Santa Barbara to the Mexican border.
Egill Hauksson, a research professor of geophysics at Caltech, said of the 5.2 quake: "It was the biggest one for a while.”
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