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fault line

fault line

16 4.7
A crack in the ground where the land moves, often causing earthquakes
  • noun
  • /fɔlt laɪn/
  • Specialized
translation icon : falla
  • Social capital that most observers assumed to be fragmented along ethnic and urban-rural fault lines was actually remarkably coherent.
  • fault line that divides
  • fault lines run
  • a new fault line

No, the fault line here runs in a different direction.

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Examples

  • From all of your intel, the deepest fault line is here.

    Fiction book (1998)
  • There are many old fault lines that one can claim run through the former Yugoslavia.

    Academic text (1998)
  • No, the fault line here runs in a different direction.

  • Their end of the fault line has not moved yet.

  • Of course this place is built on a fault line.

  • Fault lines, they run throughout the whole continental US.

  • In order to split this rock on the fault line, we're gonna have to drill to 800 feet.

  • The fault line is unstable... ...which is why you get earthquakes in California.

  • Then you should be able to see the fault lines, which exist Along the edges of the tectonic plate.

  • The city is prone to earthquakes because it sits directly on a fault line.

Synonyms

fault
vsfault line
  • Specialized
63 6.1

A crack in the earth's crust where the ground has moved

is the surface trace marking that displacement rather than the crack itself
geological fault
vsfault line
  • Specialized
1 5.0

A crack in the Earth's crust where rock layers move

is the surface trace of that break rather than the subsurface crack

Surface Forms

fault line singular
fault lines plural

Morphology

fault + line

The meaning is directly compositional: a 'fault line' is simply a 'line' that marks a 'fault' (a tectonic fracture), so the compound’s sense follows straightforwardly from the constituent meanings. This noun–noun formation is a common, cross-linguistic descriptive pattern (e.g. Spanish 'línea de falla'), so a B1 learner who knows both words should be able to infer the MWE’s meaning.

Etymology

The noun fault line comes from the image of a long fault, a crack in the earth, that makes a visible line where the ground has 'moved' or 'broken'. So a fault line means the place where the ground can shift and cause earthquakes.