Structural Geology Flashcards
Structure vocab
Accuracy
How close a measurement conforms with a standard or accepted value.
Apparent dip (a)
The inclination of a plane measured in a direction not pependicular to strike.
Apparent dip direction
The bearing of a vertical plane containing the apparent dip angle.
Attitude
The orientation in space.
β
The angle between strike and the apparent dip direction.
Bearing
The horizontal angle between a line and a specified coordinate direction, usually north or south.
depth (d)
The vertical distance from the ground surface downward to a feature of interest.
Dip (σ)
The inclination of the line of greatest slope of an inclined plane, measured perpendicular to strike.
Directed line
A lone described by its bearing and plunge.
Fold line
A hinge line along which a vertical cross section may be constructed and then flattened out to a horizontal or map view.
Inclination
General term for the vertical angle between the horizontal and a plane or line, measured downward.
Outcrop width (w)
The width of an outcrop, as measured on a map view, perpendicular to strike.
Pole
A line perpendicular to a plane, and represented as a point on a stereographic projection.
Plunge
The vertical angle between a line and horizontal
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.
