Fault

[mbeaufils]

Source definition : from IUGS and OGC GeoSciML

A shear displacement structure includes all brittle to ductile style structures along which displacement has occurred, from a simple, single 'planar' brittle or ductile surface to a fault system comprised of tens of strands of both brittle and ductile nature. This structure may have some significant thickness (a deformation zone) and have an associated body of deformed rock that may be considered a deformation unit (which geologicUnitType is ‘DeformationUnit’) which can be associated to the ShearDisplacementStructure using GeologicFeatureRelation from the GeoSciML Extension package

[mbeaufils]

NB : the term Fault is prefered in IFC GeoSubgroup but keeping the same definition.

[jjkaelin]

Fault is what is used in practice, seems to be a lot better term to me. This is then similar - in vocabulary terms - to the use of Fold.

[dponti]

I agree that the use of Fault is in more common usage and fits the definition above.