It is funny that they are preparing to deal with the effects of a magnitude 9.0 earthquake along the Cascadia Subduction Zone, because that is precisely the size of earthquake that I warned about in an article back in March.
Everyone in the Northwest knows about this possibility so is only normal to try to prepare for it.
It's not clear that the tsunami would affect millions of people. Large parts of the Oregon and Washington coast are not heavily populated. Portland is over 50 miles inland as the crow flies and further inland along the Columbia River. Parts of Seattle and Tacoma are at sea level, but other parts are quite far above the water. Also both these cities are on Puget Sound rather than directly on the Pacific Coast. Parts of Vancouver BC are at low elevation but Vancouver is also behind Vancouver Island.
How many dams will survive???
That MIGHT amplify waves.
Similar to the BAy of Fundy.