The Seattle area had a big earthquake about 20 years ago[0], which was most certainly felt in Olympia. But that's the only time I've felt the earth tremble in the 20 years I've lived in the Seattle area. But WA does get them once in a while. [1] Personally, it's low on my list of things I worry about.

[0] https://en.wikipedia.org/wiki/2001_Nisqually_earthquake [1] https://en.wikipedia.org/wiki/List_of_earthquakes_in_Washing...

1 in 3 of a very large earthquake hitting in the next 50 years: https://today.oregonstate.edu/archives/2010/may/odds-huge-qu...

That could cause a large to very large tsunami.

The place we selected is proof against any Tsunami, and massively over-built to handle large earthquakes.