The primary hazards of an earthquake are crustral fracturing and groundshaking
The secondary hazards include liquifraction, landslides and tsunamis
The process of liquid fraction is when Earthquakes compact looser, sediment of sand and gravel that.
Most tsunamis are generated by submarine Earthquakes at subduction zones.
Tsunami's
The seabed is displaced vertically up or down. The motion displaces a large volume of water in the ocean column where which then moves outwards from the point of displacement.