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27 Cards in this Set

  • Front
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Fault

A fracture on Earth's crust along which movement has occured.

Joint

A frature on Earth's crust along which no movement has occured.

Types of Faults A

Normal: Footwall moves up relative to hanging wall, perhaps the most imporant and persisiting landscape.

Types of Faults B

Reverse: Footwall moves down relative to hanging wall, does not persist in landscape.

Types of Faults C

Strike-slip: Crusted block move laterally past each other.

Faulting topography A

Normal: Fault scarps, grabens, horsts, half-grabbens, and tilted rocks.

Faulting topography B

Reverse: Weak topographic expression only develops on association wtih high-angle faulting.

Faulting topography C

Strike-slip: Shutter ridges and and fault scarps.

Geological evidence of Faulting A

Exposure of fault surface

Gological evidence of fauting B

Precense of fault breccia or crushed zones/

Geological evidence of fauting C

Slikensides and slikenlines: polished or striated surfaces.

Geological evidence of faulting D

Zones of excessive jointing a fracturing

Geological evidence of faulting E

Visible displacement of dikes, veins of rock strata against the fault.

Geological evidence of faulting F

Offser of strems, beds, dikes, or veins where fult is concerted.

Geological evidentce of faulting G

Repetition or omission or strata.

Fault Scarp

Corresponds direclty to the direction of fault plane.

Fault line scarp

Scarp developed in respose to faulting but no longer corresponds to location of fault place.

Diagnostics for fault line scarps A

Poor correlation between rock resistance and topography.

Diagnostics for fault line scarps B

Rift terraces: say ponds, basins and discordent topography.

Diagnostics for fault line scarps C

Abnormally small alluvial plains.

Diagnostic for fault line scarps D

Displacement of older topographic surfaces.

Diagnostic for fault line scarps E

Warped terraces.

Diagnostics for fault line scarps

Scarps across alluvial deposits.

Evidence of fault line scarps A

Close correlation between rock resistance, structure and topography.

Evidence of fault line scarps B

Scarps situated on downtown (lower) side of of fault.

Horst

Represents a block pushed upward relative to the blocks on either side by the faulting

Grabben

A block generally long compared to its width that has been lowered relative to the blocks on either side due to the faulting