As a structural engineer that was involved in damage assessment and repairs post-Northridge and Nisqually quakes, I've long kept an eye on the USGS seismic activity sites. There's this thing called the Juan de Fuca fracture zone along the coasts of WA, OR and N. CA with the Cascadia subduction zone as part of that. On Google Earth, the fracture zone looks like saw teeth off of our coast. Both are part of the larger fault lines that border the Pacific Ocean so when large seismic events occur way over in Japan, the energy can and does flow up along those fault lines to the Kamchatka Penninsula, Aleutian chain, W. AK and down into our neighborhood before rattling the craton plates of the lower 48.

That said, there have been literally thousands of smaller magnitude (<2.5) tremors from Vancouver Island to N. CA since the end of January. 758 just yesterday as the subduction plate grinds westward under our west coast.

PNSN

Not making any predictions but you may want to keep some basic supplies handy if stored energy from all the recent movement is suddenly released in the form of a big shake....