Canada's largest recorded onshore earthquake struck Vancouver Island, British Columbia.

The 1946 Vancouver Island earthquake struck Vancouver Island on the coast of British Columbia, Canada, on June 23 at 10:15 a.m. with a magnitude estimated at 7.0 M_s and 7.5 M_w. 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.

Vancouver Island is an island in the northeastern Pacific Ocean and part of the Canadian province of British Columbia. The island is 456 km (283 mi) in length, 100 km (62 mi) in width at its widest point, and 32,100 km² (12,400 sq mi) in total area, while 31,285 km² (12,079 sq mi) are of land. The island is the largest by area and the most populous along the west coasts of the Americas.

British Columbia, colloquially referred to as B.C, is the westernmost province of Canada. Situated in the Pacific Northwest between the Pacific Ocean and the Rocky Mountains, the province has a diverse geography, with rugged landscapes that include rocky coastlines, sandy beaches, forests, lakes, mountains, inland deserts and grassy plains. British Columbia borders the province of Alberta to the east; the territories of Yukon and Northwest Territories to the north; the U.S. states of Washington, Idaho and Montana to the south, and Alaska to the northwest. With an estimated population of over 5.7 million as of 2025, it is Canada's third-most populous province. The capital of British Columbia is Victoria, while the province's largest city is Vancouver. Vancouver and its suburbs together make up the third-largest metropolitan area in Canada, with the 2021 census recording 2.6 million people in Metro Vancouver. British Columbia is Canada's third-largest province in terms of total area, after Quebec and Ontario.