The Greater Vancouver Regional District of southwest British Columbia is a highly urbanized and industrialized area that lies in Canada's most seismically active region, overlying the Cascadia subduction zone. The Fraser River delta is the most seismically vulnerable area within this region. A significant effort has been made to identify potential geohazards and refine assessments of earthquake ground-surface responses to an earthquake on the delta, both on-and offshore. These studies involve state-of-the-art geological, geophysical, and geotechnical techniques including coring, drilling, geotechnical and geophysical boring, and electromagnetic, seismic reflection, refraction, and shear-wave surveying. This research has led to the identification of numerous failure features, possibly related to past earthquakes, and to the prediction that the top 10 to 20 m of sediment over much of the delta, on-and offshore, are susceptible to seismic lique-faction and possible flowsliding. Ground-surface response modelling should take into account three-dimensional and ground-motion amplification effects.