On June 23, 1946, at 10:13 a.m., the largest onshore earthquake in Canadian history struck near Courtenay on Vancouver Island. The 7.3 magnitude tremor lasted 30 seconds, causing widespread damage and panic from Portland, Oregon, to Prince Rupert, British Columbia.
The Earthquake's Impact
According to Earthquakes Canada, the quake was accompanied by a low rumbling sound, described as a deep growl. Brick chimneys crumbled, windows shattered, and landslides occurred across Vancouver Island. A 25-storey-high cliff slid into Deep Bay near Qualicum Beach, generating a wave that capsized a small boat and drowned a 56-year-old man.
The worst structural damage occurred in Courtenay, where the elementary school and post office were heavily damaged. The upper floor of the school was nearly wrecked by a falling chimney, while the post office's upper portion collapsed, scattering debris. Three-quarters of the chimneys in Courtenay, Cumberland, and Union Bay were damaged, with additional destruction in Comox, Port Alberni, and Powell River.
Lucky Timing Saved Lives
The earthquake's timing on a Sunday morning limited casualties. No children were in school, and few people were in downtown Courtenay, where several banks were also damaged. In Seattle, one resident died of a heart attack from the shock, but overall fatalities were minimal.
Shaking Across the Region
The epicentre was located in the Forbidden Plateau, about 30 kilometres northwest of Courtenay. The tremor was felt as far south as Portland, Oregon, north to Prince Rupert, and east to Kelowna, where a slight tremor caused some churchgoers to leave their service.
In Vancouver, the Lions Gate Bridge swayed crazily during the quake. Two women cycling across the bridge feared it would collapse, but they remained unharmed. The worst property damage in Vancouver was at the Canadian National Railway station, where a 25-pound piece of masonry fell to the sidewalk. The giant neon clock atop the Vancouver Block stopped at 10:14:30 a.m., marking the moment of the quake.
Aftermath and Legacy
Earthquakes Canada officially designated the event as the M7.3 Vancouver Island Earthquake of 1946. It remains the largest onshore earthquake in Canadian history, serving as a reminder of the region's seismic risk. The event prompted ongoing efforts to improve building codes and earthquake preparedness in British Columbia.
