#fault_line__faultline  (geology) line determined by the intersection of a geological fault and the earth's surface
  supertype:  line.location  a spatial location defined by a real or imaginary unidimensional extent
  part of:  geological_fault__fault__shift__fracture__break  (geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other; "they built it right over a geological fault"

No statement uses or specializes fault_line; click here to add one.