The Laurentian Slope Seismic Zone is a seismically active area in Atlantic Canada located on the Grand Banks of Newfoundland. It was the epicenter of the magnitude 7.2 1929 Grand Banks earthquake. Since then, more than 20 relatively minor earthquakes have occurred. References Geology of Newfoundland and Labrador Earthquakes in Newfoundland and Labrador Seismic zones of Canada