1. A TRUE DIP FROM TWO APPARENT DIPS

Problem: Dipping planes show a different dip depending on the orientation of the viewer: this dip is known as the apparent dip and is NOT the true dip. The "true" dip of the plane is the maximum dip. Often you may not be able to measure the true dip but you can estimate the true dip if you have two apparent dips.

Question: Derive graphically the true dips from the following apparent trends and plunges (lines).

1. N60E/20 N75E/32

2. N60E/67 N4W/34

3. N40W/35 N85W/15

4. N75E/28 S70E/43

5. S70E/43 S2W/25

6. S35W/24NW S15W/13
 
 
 
 
2. THREE-POINT BED PROBLEM

Problem: A plane can also be defined provided that the position of any three points on the plane be known. The plane that is common to all three is unique.

(a) Use the attached Map (#14)

(i) to calculate the strike and dip of the coal seam and,

(ii) to calculate the depth to the coal seam at D.
 
 
 
 

  1. From Map # 17, ONLY calculate the strike and dip of the beds.