I had hoped California would have fallen into the sea by now, they've been talking about that since I was a kid.
Never gonna happen.
The fault lines responsible for the constant earthquake quakes felt in Cali run parallel to each other. Grinding along side of each other, like a car sideswiping another car, causing a constant tremble but limited in their capacity.
What they found is the fault line off the coast of Oregon, Washington and Canada, way out in the pacific Ocean, runs into the opposite tectonic plate. In other words like a head-on collision. Only at some point between the last collision- iirc about 600 years ago- and today, they DID collide but the plate that Oregon, Washington and Canada sit on slid over the top of the plate the pacific ocean sits on- and in fact the ocean plate is pushing up the land plate. This has been going on for more than 600 years but every thousand years or so there is a massive, tsunami causing quake that eases off a little pressure.
Anyway, the area where the plates now sit on top of one another is called the Cascadia Subduction Zone. This area is subject to unimaginable friction, causing heat build up and lava, which in-turn is responsible for the cascading mountain range.
When the pressure gets too intense their will be another massive volcanic eruption like Mt. St. Helens, or even multiple volcanic eruptions and the upper plate- the land mass that houses Oregon, Washington and Canada- will Crack along the subduction zone and fall into the Ocean. Literally. The drop will only be about 20 feet or so but imagine -if you will- everything west of Mt. St. Helen's, including Portland, Seattle and all their buildings and everything else in between the mountain range and the west coast, suddenly dropping 20 feet.
If the sudden drop of thousands of square miles of land doesn't kill you, the collapse of thousands of buildings will, and if you somehow manage to survive all that, the tsunami that will sweep in hundreds of miles surely will. Not to mention if you live within a few miles of the coast you will suddenly find yourself at least 20 feet beneath the surface of the ocean.
And if that doesn't happen first, the super volcano beneath Yellowstone will fuck the entirety of north America.
So... good times.