What is the basic difference between a fault and a joint?

A fault has displacement of the two sides along the fracture, a joint has none or negligible

A joint has large displacement, a fault has none

A fault occurs only in igneous rock

A joint is always much longer than a fault

Which features are typical of a fault but not of a joint?

Breccia, gouge, slickensides and drag folds

Regularly spaced sets with clean surfaces

Cooling cracks and mineral filling only

How do joints usually occur?

In regularly spaced sets and systems

Which is a major engineering effect of faults but not typically of joints?

Seismic hazard and a major weak zone with large leakage

Providing small seepage paths only

Being only a minor surface crack

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Fault versus joint

Short answer

A fault shows displacement along the fracture, producing breccia, gouge, and slickensides; a joint lacks significant movement. Faults offset beds and cause earthquakes; joints reduce rock strength and control seepage without large displacement.

Differentiate between fault and joint.

Point	Fault	Joint
Movement	Displacement of the two sides along the fracture	No displacement, or negligible
Size	Long, from metres to hundreds of kilometres	Short, usually in centimetres to metres
Associated features	Breccia, gouge, slickensides, drag folds	Usually clean surfaces; sometimes mineral filling
Occurrence	Single plane or zone	In sets and systems, regularly spaced
Cause	Tectonic stress above rock strength, with relative movement	Tension, cooling, unloading or compression without movement
Effect	Offsets beds, causes earthquakes	Provides weak planes and ground water paths
Engineering effect	Major weak zone, large leakage, seismic hazard	Reduces strength, causes seepage and slope failure

✓ Answer checked by Claude Opus 5.5 (high effort)

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