Not to mention that a very large number of homes in Western Washington are at least 80 years old. The house I live in was built in 1919. It's wood construction and has been gutted/remodeled, but it's also been added onto at least once and has no real foundation, but I think it might be a pier and beam type. An earthquake of large size, 7.0+ will probably cause major damage. For reference, I live near Chehalis, WA.