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Automatic generation of co-seismic displacement

What does seismic displacement refer to?
Seismic displacements have a horizontal and a vertical component.
The horizontal component is often clearly visible along fault lines activated by the earthquake, though more or less regular horizontal deformation may extend along the surface of nearby crustal blocks.
What is the definition of displacement in earthquakes?
The second main earthquake hazard is ground displacement (ground movement) along a fault.
If a structure (a building, road, etc.) is built across a fault, the ground displacement during an earthquake could seriously damage or rip apart that structure.
The tectonic plates are always slowly moving, but they get stuck at their edges due to friction.
When the stress on the edge overcomes the friction, there is an earthquake that releases energy in waves that travel through the earth's crust and cause the shaking that we feel.

What does seismic displacement refer to?