Scientists have discovered a massive tear in the tectonic plate off the coast of Vancouver Island. This "rip" suggests that the northern end of the Cascadia Subduction Zone is actually starting to shut down. The CBC’s Johanna Wagstaffe investigates what this discovery might mean for the "Big One" off the coast of Vancouver Island. The Explorer plate is not sub-ducting which is causing a tear in the junction with the Juan de Fuca plate. Check out CBC short piece on this new di