elsongs - I'm not sure you got your facts right.
The 1964 Alaska earthquake was a 9.2 megathrust, the same type as the Japan earthquake. It was between the Pacific and North American plate - and those are the two that go alongside the west cost of the entire US, not just Alaska. Megathrusts are possible in all of the West Coast, and they're typically above 8.0.
And this is an Alaskan ghost town that was destroyed and where trees were killed by the salt water of the tsunami. Still to this day, trees doesn't grow there, and you can see the dead trees still standing:
There were tsunamis in the US and Canada as the result of that Alaska earthquake... so tsunamis are possible in the US.
No, I have my facts right, I studied some geology in school. You simply misread what I said.
I'd like to know where you got your "Megathrusts are possible in all of the West Coast" statement, when it's simply not true: http://www.latimes.com/news/local/la-me-tsunami-california-20110315,0,7384994.story
Megathrust quakes are generated where there are subduction zones. Subduction zones are where one plate is forced under another. There are no subduction zones off the coast of California, which is what I was specifically referring to. I am well familiar with the diagram you posted. The boundary between the Pacific Plate and the North American Plate in California is the San Andreas Fault, which is NOT a subduction zone but a strike-slip fault. The plates slide against each other, instead of forcing one plate under another. See the red arrows iover California n the diagram you posted? They are moving in different directions. Now look at the arrows near Alaska and Japan. They are pointed towards each other. I guess you didn't know what they mean.
Just because a plate is bounded by another, it doesn't meant the geological action is the same all throughout. The Pacific Plate is moving in a northwesterly direction. Off of Alaska and Japan, it is being forced under another plate. Along California, it is sliding with the other plate. in the Southeastern Pacific Ocean, the Pacific Plate is moving away from the other plate.
A lot of people misunderstand "The Ring Of Fire." It is simply a zone around the Pacific Ocean that is highly geologically active, but the mechanics of that activity differ in various places.
As for tsunamis, I was talking about earthquakes in California GENERATING tsunamis, which will not happen. Will we receive tsunamis? Of course, it's already been demonstrated on Friday. But they will be generated elsewhere, like off of Alaska or in the Pacific Northwest, or across the ocean.
Again, you totally misread what I had to say.