opossum said:
Thank you all for the replies. You have given me a lot to think about. Whether or not there will be a tsunami, I don't know but I do think the dream was a warning that I should not go to Seattle if I want to survive what ever is coming.
I concur with Anart that since you've found such dreams prophetic, moving back to Seattle might not be a good idea for you. But perhaps not for the specific reason the surfaced explicitly in your dream.
While Yellowraven's assessment of the earthquake and tsunami dangers in the Puget Sound region seem reasonable to me, I'd be somewhat less apprehensive than that. Even a giant earthquake on the Juan de Fuca tectonic plate boundary would be about a couple of hundred miles or more out in the Pacific, and just as Yellowraven said, a tsunami would have to traverse the Straight and Puget Sound before it reached Seattle, and by then its height and destructive power would be attenuated by maybe half or more. So a Fukushima type 20 meter tsunami that hit the Pacific facing west coast of Washington would be much smaller by the time it reached Elliot Bay. I wouldn't be worried there, if I lived even 100 feet above the Sound, but I might be a little nervous if I lived right on the waterfront.
Mr. Premise mentioned 'active' volcanos and "a very large caldera" in Washington, too. However, the only recently active volcano in the Pacific Northwest is Mt St Helens, and that last erupted in 1980 - 33 years ago this May - and it rumbled for months before it exploded so spectacularly. Mt Ranier is not showing any warning signs, and it is the only large volcanic peak in the Cascades near Seattle. The large volcanic caldera closest to Seattle is Yellowstone, in Montana, I believe. Crater Lake down in sourthern Oregon is relatively small, so that doesn't count. So I tend to discount volcano dangers.
However, 'tsunami' could have been a metaphor in your dream. Maybe your subconscious used that simple concept to stand for something else it's apprehensive about that's more linguistically complex like economic turmoil, civil unrest, government repression and the ripples of ensuing consequences.
However, if that's part of "what's coming", I'd rather be in the Pacific Northwest than anywhere else. I might be biased, though, because I grew up and spent most of my life here. It has no nuclear plants.