A group of Canadian geologists have discovered that a massive earthquake and tsunami hit the Pacific northwest in January 1700, triggered by the Cascadia Subduction Zone. The geologists used undisturbed sediment in the Effingham Inlet in Barclay Sound and ash from Mount Mazama's volcanic eruption in 5,677 B.C. to date the earthquake. "We know the longest time between earthquakes [in Effingham Inlet] is 1,000 years. The next earthquake could be tomorrow or it could be 700 years from now," said study co-author Audrey Dallimore.