Large parts of downtown and the area between Queen Anne and Capitol Hill ( where the Amazon campus is ) are built on fill, and are likely to be subjected to liquefaction in a major seismic event. It's entirely possible that whole sections of Capitol Hill could slide into downtown too.

The hills shake and the mountains dance, and then comes the tsunami; this sounds much more exciting to read about than live through.

Here's a map of liquefaction risk in King county: http://your.kingcounty.gov/dnrp/library/water-and-land/flood...

Thanks! I was going to be googling for that shortly. :-)