It’s probably a mistake to try to separate “infectious” and “genetic”.

4 feet is equivalent to a modest storm surge in Florida, where the terrain is more vulnerable than here. And note that this is projected for a magnitude 9 quake, which is at the high end of the expectations. I agree though that we need to do MUCH more to prepare for it.

Yes and no. A tsunami from a mag 9 earthquake in the Cascadia subduction zone would inundate areas near the strait of Juan de fuca, but would only be about 4 feet in Seattle. Not trivial for sure, and you’re right about other faults under the Sound itself.

wsg.washington.edu/could-a-tsun...

I live in this region. It's a good article but the headline overstates it. There is a huge risk of a devastating earthquake. But the actual portion of Washington state that is vulnerable to tsunamis is relatively small and not densely populated.