Question

In the block diagram, the net slip (=100 m) is resolved into strike slip (s) and dip slip (d) components. The value (in m, correct to two decimal places) of "s" is ..... 

Hint:

When resolving a slip into strike and dip components, use the sine function for strike slip and the cosine function for dip slip.

Answer 1

Correct Answer: 86 - 87

Given:

• Net slip = 100 m
• Angle between net slip and strike direction = 30°
• Net slip makes angle with fault plane

Concept:

The net slip can be resolved into two components:

• Strike slip (s): Component parallel to the strike of the fault
• Dip slip (d): Component parallel to the dip direction of the fault

From the diagram:

The angle shown is 30° between the net slip vector (100 m) and the strike direction.

Resolving the net slip:

The strike slip component (s) is the horizontal component along the strike:

$$s = \text{Net slip} \times \cos(\text{pitch angle})$$

where the pitch angle is the angle between the net slip and the strike direction.

$$s = 100 \times \cos(30°)$$

$$s = 100 \times 0.866$$

$$s = 86.6 \text{ m}$$

Rounding to two decimal places:

$$s = 86.60 \text{ m}$$

Answer: 86.60 m