I would personally stick with the lightweight boots rather than the lightweight hiking shoes. The aftermath of an Earthquake may make downtown Seattle look like a more rubble strewn landscape that the top of the fairy hill of the Caledonians. Twisting an ankle in this scenario would be a bad thing to happen.

I personally would go with something like the Rockport Valverde II's or one of the Clarks Active Air boots which are just slightly heavier than the Brasher Supalites.

http://www.brasher.co.uk/catalogue/products/supalite-ii-gtx-r-supaiimn

2lbs 1oz is a pretty lightweight pair of boots.