I'm watching it closely myself. 2 big shakes of my screen today is enough to make me a little nervous.
Great Subduction Zone earthquakes are the largest earthquakes in the world, and can exceed magnitude 9.0. Earthquake size is porportional to fault area, and the Cascadia Subduction Zone is a very long sloping fault that stretches from mid-Vancouver Island to Northern California. It separates the Juan de Fuca and North America plates. Because of the very large fault area, the Cascadia Subduction Zone could produce a very large earthquake, magnitude 9.0 or greater, if rupture occurred over its whole area.

Originally posted by lostinspace
A number of my co-workers and I have been watching the USGS map of earthquakes since the massive Chili earthquake. We've been on edge since the number of quakes have been on the rise worldwide. Before I left work today I did not noticed these two quakes off the Oregon coast. We're going to have a bit to talk about when they see these two quakes on the map tomorrow. I wonder if we will be seeing more quakes along this Juan De Fuca plate.