Great earthquake down my 'mystery' extension of the strike-slip fault that defines the edge of Vancouver Island.
A beautiful thrust-shear combination and fairly shallow, so you know it isn't on the crummy overrated Cascadia subduction fault. :)
So, here is my original art, and there is no evidence for this fault because nobody has looked. It would be all covered in sediment, so you would have to image it. But I feel it has to be there to accommodate the sudden curve of the Cascadia.
I think this is the main shaking threat to Vancouver and Victoria, and who cares about Seattle? We can get a good 7 or 8 out of this, and it has to come before the main event, since it is a lock. Oh well, I'm glad nobody reads this.
Note to Panic-ers - This doesn't change the seismic hazard as defined by the Establishment. They've gone too high on the Cascadia. Seismic hazard can only be defined to a single log digit of PGV in 500 years. It's 1, 10, or 100 cm/s. And that mostly depends on your foundation.