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Structural Geology > LAB EXAM > Flashcards

LAB EXAM Flashcards

1
Q

what is strike

A

the orientation of a level line on an inclined surface

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2
Q

what is azimuth

A

the horizontal angle between a line and north, measured clockwise, and is always written with three digits

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3
Q

what is quadrant

A

the angle between a line and a specified coordinate direction, usually true north or south

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4
Q

what is dip

A

the inclination (vertical angle) of the greatest slope of an inclined plane, measure perpendicular to strike, and must always include a dip direction

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5
Q

what is written strike or dip

A

strike

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6
Q

what is plunge

A

the inclination between horizontal and the linear feature

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7
Q

what is trend

A

the orientation of a horizontal line parallel to the linear feature and pointing in the down plunge direction (must have three digits)

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8
Q

planes that dip upstream, “V”…

A

“v” points upstream

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9
Q

planes that dip downstream at the same angle as the stream gradient, the “v”…

A

will not exist

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10
Q

planes that dip downstream at an angle shallower than the stream gradient, the “v”…

A

“v” point upstream

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11
Q

planes that dip downstream at an angle greater than the stream gradient , the “v”…

A

“v” points downstream

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12
Q

vertical planes go straight across all topography

A

no “v”

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13
Q

horizontal planes follow contour lines and will…

A

follow the “v” for the stream

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14
Q

what is a great circle

A

the intersection of the equator in two diametrically opposed points

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15
Q

what is a spherical projection

A

a projection onto the equatorial plane of the lower half of the sphere

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16
Q

what is a stereonet

A

the grid defined by the stereographic projection of great and small circles

17
Q

equal angle projection

A

the angle between the two tangents to great circles on the net

18
Q

what is a beta diagram

A

great circle plots of the limb planes, with their intersection being the fold axis

19
Q

how to find fold axis of beta diagram in stereonet

A

plot limbs as planes then calculate the plane intersection

20
Q

what is a Pi diagram

A

the fold axis is found by aligning the limb plane poles onto a great circle, and finding the pole to that circle

21
Q

how to find fold axis from Pi diagram in stereonet

A

find the poles of the planes and click on stereonet for intersection

Structural Geology (3 decks)

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