Will be over in 30 minutes or so following an earthquake. Outer coast tsunamis . Distant tsunamis allow many hours of response time. May have damaging waves for 12 hours following the earthquake. Locally, great devastation will follow a tsunami.
Many deaths are possible from debris.
Scenarios provide guidance for emergency managers. The Seattle fault scenario showed areas of inundation in Puget Sound with strong currents around Harbor Island. Source parameters for crustal fault earthquakes are poorly known. Landslide-generated tsunamis often have wave heights offshore that are comparable to runup heights. Tsunamis will have effects not currently expected, such as the amount of strain on the pontoon cables for floating bridges in Lake Washington.