Looks like the 1872 earthquake was right in your backyard! Could be another, someday. Better send that 'vert to this side of the cascades for safekeeping.
http://seattletimes.nwsource.com/html/localnews/2001199284_earthquake22m.html
http://seattletimes.nwsource.com/html/localnews/2001199284_earthquake22m.html