Segment linkage process at the origin of slip surface roughness: Evidence from the Dixie Valley fault

► The morphology of the Dixie Valley fault has been measured in 3D. ► The fault slip surface is characterized by a fractal geometry. ► This geometry is explained by the formation of lenses of damaged material. ► A geometrical correlation exists between the slip surface and the damaged zone. ► This correlation is explained through a mechanical model.