Plates also slip past one another, as along the San Andres Fault.
Plate boundaries are sites of much seismic activity and British Columbia is no exception.
Most of the province s earthquakes, however, occur off the west coast. British Columbia is most directly affected by the actions of the North American Plate and the Juan de Fuca and Explorer Plates . In the 1970s, the Juan de Fuca Plate was moving 4 - 6 centimetres annually.