Interesting and also terrifying stuff... And good questions of yours, BTW. :-)
I went and compared those slip values you cited to those of the 2004 Indian Ocean earthquake.
https://en.wikipedia.org/wiki/2004_Indian_Ocean_earthquake_and_tsunami
150 feet of slip with a 30 ft. drop is a LOT. Any guess as to the length of the rupture?
I guess some geologist did that to see what might happen along the entire area.
The most aggressive stress point of that fault, cascadian, is 50 miles inland from the coast.
They simply do not know yet what will happen because of the ground deformation up there. They can only guess and use computer models to get an idea. So..their prediction of anything east of the Cascades being toast I would imagine is pretty accurate?
There was a vid of volcanologists doing a study in S America on if far off earthquakes can effect volcanoes. They put sound recorders near active vents down there and recorded the normal sounds of the volcano and to see if there was any change from a earthquake. There was a massive BANG when an earthquake happened and the normal sounds of the volcanic system changed for quite a long time.
So as you know, there are quite a lot of volcanoes-heck the whole Cascade range is volcanoes.
I wish I would've went to school for geology.