I had the same worry three years ago when I moved here. And of being the closest big metro to North Korea. I've gotten used to it. After doing a bit of research I realize the story is overblown (I mean, it'll be bad, especially on the coast, but most people a bit inland will survive and carry on. I lived through Wenchuan so.).

I'm far more afraid of these giant Douglas Firs and their branches during snow and wind storms now. And, the likely drop in home value in the next recession.

And realistically I should be more afraid of driving to work every day. (Even though Seattle seems to have pretty good drivers compared to Chicago).