Structural Geology - Exam 2

What are the two linear orientations

Trend, plunge

Trend

Angle relative to north

Plunge

Angle below the horizon

What are the planar orientations

Dip, strike

Dip

Angle of inclination of a plane

Strike

Direction of a horizontal line on an incline plane

How do you write in Quadrant form

Strike: N/S (0-90) E/W

Dip: N/S (0-90) E/W

How do you write in azimuth form

Strike: (0-360)

Dip: N/S (0-90) E/W

How do you write in RHR

Strike: 0-360

Dip: 0-360

How do you write in dip direction

Strike + 90

Kinematics

Study of motion and displacement of geological features and their spatial relationships

Translation

All displacement vectors (paths) are straight

Rotation

Curved and concentric partial paths of different radii

Strain

Non rigid body deformation

Principal stretches

S1: min elongation

S3: max elongation

S1*S3 > 1

Area is not conserved

S1*S3 = 1

Area is conserved

Shear strain

Angular strain

Plane strain

Strain is occurring in two dimensions, but no strain in the third dimension

(T/F) In plane strain, the S1 and S3 balance out

True