There is an earthquake as big as the one that just hit sitting just off the coast.

[link|http://www.em.gov.bc.ca/Mining/Geolsurv/Surficial/quake/eq4.htm|http://www.em.gov.bc...ial/quake/eq4.htm]
[link|http://www.pgc.nrcan.gc.ca/seismo/hist/1700.htm|http://www.pgc.nrcan...smo/hist/1700.htm]
[link|http://www.pnsn.org/HAZARDS/CASCADIA/cascadia_event.html|http://www.pnsn.org/...scadia_event.html]

However our current best guess is that the next one is 100-300 years off.

Cheers,
Ben