Question

The orientations of two planar limbs of an overturned anticline are 045°/72°SE and 225°/37°SE. The interlimb angle of the fold in degrees is ........... (In integer)

Hint:

The interlimb angle of a fold is the angle between the planes of the two limbs, and can be calculated using the difference in dip and strike between the two limbs.

Answer 1

Step 1: Understand the given data.
- The orientation of the first limb is 045°/72°SE, which means:
- The strike is 045°.
- The dip is 72° SE.
- The orientation of the second limb is 225°/37°SE, which means:
- The strike is 225°.
- The dip is 37° SE.
Step 2: Calculate the angle between the two limbs.
The angle between the two limbs can be calculated using the formula: \[ \theta = 180^\circ - |\text{Strike}_1 - \text{Strike}_2| \] where \( \text{Strike}_1 = 045^\circ \) and \( \text{Strike}_2 = 225^\circ \). Substituting the values: \[ \theta = 180^\circ - |045^\circ - 225^\circ| = 180^\circ - | -180^\circ | = 180^\circ - 180^\circ = 0^\circ \] The interlimb angle is the difference between the dips: \[ \text{Interlimb angle} = 72^\circ - 37^\circ = 35^\circ \] Final Answer: \[ \boxed{35} \]