GEOL101 LAB 7
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San Diego State University *
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101
Subject
Geology
Date
Feb 20, 2024
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3
Uploaded by ChancellorMask13509
GEOL101 Dynamics of the Earth – Fall 2023
Name:
Lily Razzano
Laboratory 7: Rock Deformation
Section: 03
1.
By examining the dip directions on the strike and dip symbols, which direction is
the north limb (upper half) dipping: north, south, east, or west?
Based on the strike and dip symbols, the north limb ( upper half ) is dipping north and the
south limb ( lower half ) is dipping south.
2.
By examining the dip directions on the strike and dip symbols, which direction is
the south limb (lower half) dipping: north, south, east, or west?
The south limb ( lower half ) is dipping south.
3.
Based on your answers to Questions 1 and 2 what type of fold is this, syncline or
anticline?
Anticline because the dip direction is away from each other.
4.
Would the limbs on this fold form a topographic high or a topographic low?
The limbs of this fold form a topographic high because the figure indicates an anticline.
A fold found in the central portion of Iran is shown to the right. Use this screenshot from Google
Earth to answer Questions 5 to 8. The fold axis is depicted by the black line, and some strikes
and dips on both limbs of the fold are included. Note that North is up in this image!
5. By examining the dip directions on the strike and dip symbols, which direction is the
west limb (left half) dipping: north, south, east, or west?
The west limb (left half) dips towards the west.
6. By examining the dip directions on the strike and dip symbols, which direction is the
east limb (right half) dipping: north, south, east, or west? Refer to Figures 3C and 4C for
examples.
The east limb (right half) dips towards the east.
7. Based on your answers to Questions 1 and 2, what type of fold is this, a syncline or
anticline?
Based on the above observation, it's a syncline. As both limbs dip towards each other.
8. Would the limbs on this fold form a topographic high or a topographic low?
The limbs of the fold form a topographic low as the limbs dip towards the center.
9. How many anticlines are in Figure 5?
There are 4 anticines in figure 5.
10. How many synclines are in Figure 5?
There are 3 synclines in figure 5.
11. Based on the fold pattern you observe in Figure 5 what type of fold would you
hypothesize to be located to the north of fold G? And similarly, to the south of fold A?
Based on the fold pattern, there should be a syncline to the north of fold G and another syncline
to the south of fold A.
12. Line D-E is drawn perpendicular (at a right angle) to the folds present in Figure 5.
Starting at D and moving towards E, choose the pattern below that matches the fold
sequence:.
A. syncline, anticline, syncline, anticline, syncline, anticline, syncline
B. anticline, anticline, syncline, syncline, anticline, anticline, syncline
C. anticline, syncline, anticline, syncline, anticline, syncline, anticline
D. syncline, syncline, anticline, anticline, syncline, syncline, anticline
13. Examine the outcrop in Figure 7 above and locate the fault. If you drew a line along
the faulty surface, which two letters would this line most likely intersect?
Letters J & D
14. In Figure 7, which side of the fault is the hanging wall block: Left or right?
Right, the right side of the fault is the hanging wall block
15. Did the hanging wall block in Figure 7 move up or down relative to the foot wall?
Moving up the wall
16. What type of fault is depicted in Figure 7?
The given figure depicts a reverse fault figure.
17. Based on your answer to Question 15, did this fault form under compression or
extension?
Compression
17. Examine the outcrop in Figure 8 above and locate the fault. If you drew a line along
the fault’s surface, which two letters would this line most likely intersect?
18. Which side of the image in Figure 8 is the hanging wall block?
Right side
19. In Figure 8, does the hanging wall block move up or down relative to the footwall
block?
Moves down
20. Under what conditions would a fault, like the one depicted in Figure 8 occur?
Extension or compression?
Extension
21. What type of fault is shown in Figure 8?
Normal Fault
21. Figure 10 is an aerial image of a fault in China. Notice the landscape and how certain
features are being offset by a fault. Identify the fault orientation. Which two letters would
this line most likely intersect?
C & M Normal
22. Based on how the landscape is offset what type of strike slip fault can be found here?
How do you know? Use evidence in the picture to justify your answer.
Left Lateral Strike-Slip Fault. The faulted blocks have moved anticlockwise.
23. Figure 11 is a picture of a fault in Southern California. Using a pen or pencil, draw in
the trace of the fault across the picture.
Straight line from the left to the right side about in the middle.
24. What type of strike slip fault is this based on Figure 11? How do you know? Use
evidence in the picture to justify your answer.
Right lateral strike slip fault. The movement is clockwise, The top section has moved toward the
right.
25. Which of the three major plate boundaries, convergent, divergent, or transform,
commonly show strike slip faults? What is the name of the closest strike slip fault along
a major plate boundary and why is that relevant to San Diego? Think back to the plate
tectonics lab
Strike-slip faults are associated with transform plate boundaries. San Diego is associated with
Rose Canyon Fault, a right-lateral strike-slip fault passing along the north-to-south direction.
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