Researchers in the Science Advances journal have found a "megathrust fault" that could ... long strip beneath North America ...

Tectonic drama at the Cascadia Subduction Zone – as it’s known to those who know – could generate two ferociously destructive things at once: a “megathrust earthquake” and a huge tsunami.

The Cascadia subduction zone, where the oceanic Juan de Fuca plate descends beneath the overlying North American plate, extends 1100 km from northern California to northern Vancouver Island.

Monday’s early morning earthquake rattled a few nerves and had many Islanders thinking about the 'great' rattlers that have come and gone, as well as the 'big ones' looming ...