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The 1946 Vancouver Island earthquake struck Vancouver Island on the coast of British Columbia, Canada, on June 23 at 10:15 a.m. [1] with a magnitude estimated at 7.0 M s [2] and 7.5 M w. [6] The main shock epicenter occurred in the Forbidden Plateau area northwest of Courtenay .
The magnitude of a megathrust earthquake is proportional to length of the rupture along the fault. The Cascadia subduction zone, which forms the boundary between the Juan de Fuca and North American plates, is a very long sloping fault that stretches from mid-Vancouver Island to Northern California. [18]
The plateau was the epicentre of the 1946 Vancouver Island earthquake that registered 7.3 on the Richter magnitude scale, the strongest ever recorded on land in Canada. [ 3 ] Legend
For decades, scientists have warned about the potential of the Cascadia Subduction Zone, a megathrust fault that runs offshore along the coast from northern Vancouver Island to Cape Mendocino ...
First supershear earthquake observed in an oceanic plate boundary 2015-04-24 South of Haida Gwaii: 51.62 -130.77 0 0 6.2 V 2012-11-08 West of Vancouver Island 49.23 -128.48 0 0 6.1 IV [9] 2012-10-30 Haida Gwaii: 52.37 -131.90 0 0 6.2 Aftershock of 7.8 earthquake [10] 2012-10-28 Haida Gwaii 52.67 -132.60 0 0 6.3 V Aftershock of 7.8 earthquake [11]
Cascadia subduction zone, Vancouver Island. In 1996, a team of researchers linked the orphaned 1700 tsunami in Japan with a magnitude 9 earthquake and tsunami in North America in a Trans-Pacific reunion. [7]: 94–95 [8] [9] Scientists "dated the earthquake to the evening of January 26, 1700" and approximated its size as magnitude 9.
The Forbidden Plateau, in the east of the Vancouver Island Ranges, was the epicentre of the 1946 Vancouver Island earthquake that registered 7.3 on the moment magnitude scale, the strongest ever recorded on land in Canada. [41] Vancouver Island was the location of the observation of the episodic tremor and slip (ETS) seismic phenomenon.
The June 23, 1946 Vancouver Island earthquake shocked the Strait of Georgia region, causing the bottom of Deep Bay to sink between 2.7 m (9 ft) and 25.6 m (84 ft). Deep Bay is the home of the Deep Bay Marine Field Station. The Island Rail Corridor passes through the area, although there is no longer a train service in operation.