fault_line
1. [ noun ] (geology) line determined by the intersection of a geological fault and the earth's surface
Related terms: line fault geology
2. [ noun ] (geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other
Synonyms: break geological_fault fracture shift fault
Examples:

"they built it right over a geological fault"

Related terms: crack San_Andreas_Fault inclined_fault denali_fault strike-slip_fault geology
Similar spelling:   faultily
  faultless