The 1946 Vancouver Island earthquake
The 1946 Vancouver Island earthquake occurred with a moment magnitude of 7.5 that struck Vancouver Island, on the Coast of British Columbia, Canada, at 10:15 a.m. on June 23. The main shock epicenter occurred in the Forbidden Plateau area northwest of Courtenay. While most of the large earthquakes in the Vancouver area occur at tectonic plate boundaries, the 1946 Vancouver Island earthquake was a crustal event.
Shaking was felt from Portland, Oregon to Prince Rupert, British Columbia. This is one of the most damaging earthquakes in the history of British Columbia, but damage was restricted because there were no heavily populated areas near the epicentre, where severe shaking occurred. Shockwaves were felt all the way to Portland, OR.