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27 Cards in this Set
- Front
- Back
Fault |
A fracture on Earth's crust along which movement has occured. |
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Joint |
A frature on Earth's crust along which no movement has occured. |
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Types of Faults A |
Normal: Footwall moves up relative to hanging wall, perhaps the most imporant and persisiting landscape. |
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Types of Faults B |
Reverse: Footwall moves down relative to hanging wall, does not persist in landscape. |
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Types of Faults C |
Strike-slip: Crusted block move laterally past each other. |
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Faulting topography A |
Normal: Fault scarps, grabens, horsts, half-grabbens, and tilted rocks. |
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Faulting topography B |
Reverse: Weak topographic expression only develops on association wtih high-angle faulting. |
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Faulting topography C |
Strike-slip: Shutter ridges and and fault scarps. |
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Geological evidence of Faulting A |
Exposure of fault surface |
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Gological evidence of fauting B |
Precense of fault breccia or crushed zones/ |
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Geological evidence of fauting C |
Slikensides and slikenlines: polished or striated surfaces. |
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Geological evidence of faulting D |
Zones of excessive jointing a fracturing |
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Geological evidence of faulting E |
Visible displacement of dikes, veins of rock strata against the fault. |
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Geological evidence of faulting F |
Offser of strems, beds, dikes, or veins where fult is concerted. |
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Geological evidentce of faulting G |
Repetition or omission or strata. |
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Fault Scarp |
Corresponds direclty to the direction of fault plane. |
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Fault line scarp |
Scarp developed in respose to faulting but no longer corresponds to location of fault place. |
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Diagnostics for fault line scarps A |
Poor correlation between rock resistance and topography. |
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Diagnostics for fault line scarps B |
Rift terraces: say ponds, basins and discordent topography. |
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Diagnostics for fault line scarps C |
Abnormally small alluvial plains. |
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Diagnostic for fault line scarps D |
Displacement of older topographic surfaces. |
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Diagnostic for fault line scarps E |
Warped terraces. |
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Diagnostics for fault line scarps |
Scarps across alluvial deposits. |
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Evidence of fault line scarps A |
Close correlation between rock resistance, structure and topography. |
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Evidence of fault line scarps B |
Scarps situated on downtown (lower) side of of fault. |
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Horst |
Represents a block pushed upward relative to the blocks on either side by the faulting |
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Grabben |
A block generally long compared to its width that has been lowered relative to the blocks on either side due to the faulting |