Folding and Faulting Activity (Leaving Cert Geography): Flashcards

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Faulting
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Faulting definition

Rocks fracture due to compression, tension or shearing forces, causing rock displacement

Compression force effect on crust

Pushes rocks together, causing upward movement

Tension force effect on crust

Pulls rocks apart, causing downward movement

Shearing force effect

Moves rock sections laterally in opposite directions

Scarp (escarpment)

Cliff face formed by vertical rock displacement

Throw in faulting

Amount of vertical displacement of rock

Heave in faulting

Amount of horizontal displacement

Hanging wall

Section of crust above the fault line

Footwall

Section of rock beneath the fault line

Normal fault cause & movement

Tension forces; one side sinks downwards

Reverse fault cause & movement

Compression; rock slips upwards creating escarpment

Transform fault movement type

Horizontal/lateral, not vertical

Block mountain (horst) formation

Two parallel reverse faults push central section upwards

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