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22 Cards in this Set
- Front
- Back
Accuracy |
How close a measurement conforms with a standard or accepted value. |
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Apparent Dip |
The inclination of a plane measured in a direction not perpendicular to strike. |
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Apparent Dip Direction |
The bearing of the vertical plane containing the apparent dip angle. |
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Attitude |
The orientation in space. |
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Beta |
The angle between strike and apparent dip direction. |
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Bearing |
The horizontal angle between a line and a specified coordinate direction, usually north or south. |
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Depth (d) |
The vertical distance from the ground surface downward to a feature of interest. |
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Dip |
The inclination of the line of greatest slope of an inclined plane, measured perpendicular to strike. |
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Directed Line |
A line described by its bearing and plunge. |
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Fold Line |
A hinge line along which a vertical cross section may be constructed and then flattened out to a horizontal or map view. |
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Inclination |
A general term for the vertical angle between the horizontal and a plane or line, measured downward. |
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Outcrop Width (w) |
The width of an outcrop, as measured on map view, perpendicular to strike. |
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Pole |
A line perpendicular to a plane, and represented as a point on a stereographic projection. |
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Plunge |
The vertical angle between a line and horizontal. |
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Precision |
The degree of agreement or consistency of repeated measurements. |
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Projection |
The process by which points on one surface are transferred to another surface, such that in each view (map or cross section) the points correspond. |
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Rake (pitch) |
The angle measured in a specified plane, between a line and horizontal. |
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Slope Angle |
The angle from the horizontal down to the slope. |
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Stereonet |
A representation of angular relationships between planes and lines. In structural geology, a stereonet is synonymous with Wulff net, an equal angle stereographic projection. |
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Strike |
The bearing of a horizontal line on an inclined plane. |
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Thickness (t) Trench |
The perpendicular distance between the top and bottom or a geologic unit. |
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Trend |
The bearing of the vertical plane containing a line. |