Landslide Hazard - Earthquake
Homes built on moderate to steep sand dune slopes can expect ground movement similar to that observed in the above photos. Residents can expect severe damage to streets and all underground utilities.
The below listed videos show landslides caused by heavy rains during strong winter storms – which are the “most likely” disaster scenarios coastal residents should prepare for. During a Cascadia Earthquake event the dunal sands with shallow aquifer will have ground water flowing to the surface through cracks or “mud volcanoes”. The sand on moderate to steep slopes will become unstable and can be expected to flow like is observed in these videos.