Questions 1: Figure 1 shows a hypothetical system comprising Plates A, B and C. Plates A and B are separated by a mid-ocean ridge that is spreading at a half rate of 20 mm/yr. The southern end of the ridge is offset by a transform fault. Plates A and C are separated by a right-lateral strike-slip fault slipping at a rate of 30 mm/yr. The three plates intersect at a point known as a "triple junction". Mid-Ocean Ridge Plate B Plate C Triple Junction Transform Fault Plate A Strike-Slip Fault a) Figure 1: llustration of the movement of 3 plates on a flat Earth a) Mark on the figure the slip direction along the transform fault. b) What is the slip rate along the transform fault? c) Using the given motions of Plate B with respect to Plate A and Plate A with respect to Plate C calculate the motion of Plate B with respect to Plate C. d) What is the direction (i.e. azimuth) of this motion? e) What does the motion of Plate B with respect to Plate C indicate to you about the nature of the plate boundary that separates the two plates and the geological processes that are occurring there?

Applications and Investigations in Earth Science (9th Edition)
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Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
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Chapter1: The Study Of Minerals
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Questions 1:
Figure 1 shows a hypothetical system comprising Plates A, B and C. Plates A and Bare separated
by a mid-ocean ridge that is spreading at a half rate of 20 mm/yr. The southern end of the ridge
is offset by a transform fault. Plates A and C are separated by a right-lateral strike-slip fault
slipping at a rate of 30 mm/yr. The three plates intersect at a point known as a "triple junction".
Mid-Ocean
Ridge
Plate B
Plate C
Triple
Junction
Transform
Fault
Plate A
Strike-Slip
Fault
a) Figure 1: Illustration of the movement of 3 plates on a flat Earth
a) Mark on the figure the slip direction along the transform fault.
b) What is the slip rate along the transform fault?
c) Using the given motions of Plate B with respect to Plate A and Plate A with respect to
Plate C calculate the motion of Plate B with respect to Plate C.
d) What is the direction (i.e. azimuth) of this motion?
e) What does the motion of Plate B with respect to Plate C indicate to you about the nature
of the plate boundary that separates the two plates and the geological processes that are
occurring there?
f) What is the nature of the triple junction and comment whether you think the
configuration of Plates A, B and Cin Figure 1 is a stable or unstable one.
Transcribed Image Text:Questions 1: Figure 1 shows a hypothetical system comprising Plates A, B and C. Plates A and Bare separated by a mid-ocean ridge that is spreading at a half rate of 20 mm/yr. The southern end of the ridge is offset by a transform fault. Plates A and C are separated by a right-lateral strike-slip fault slipping at a rate of 30 mm/yr. The three plates intersect at a point known as a "triple junction". Mid-Ocean Ridge Plate B Plate C Triple Junction Transform Fault Plate A Strike-Slip Fault a) Figure 1: Illustration of the movement of 3 plates on a flat Earth a) Mark on the figure the slip direction along the transform fault. b) What is the slip rate along the transform fault? c) Using the given motions of Plate B with respect to Plate A and Plate A with respect to Plate C calculate the motion of Plate B with respect to Plate C. d) What is the direction (i.e. azimuth) of this motion? e) What does the motion of Plate B with respect to Plate C indicate to you about the nature of the plate boundary that separates the two plates and the geological processes that are occurring there? f) What is the nature of the triple junction and comment whether you think the configuration of Plates A, B and Cin Figure 1 is a stable or unstable one.
Mid-Ocean
Ridge
Plate B
Plate C
?|
N
Triple
Junction
Transform
Fault
Plate A
Strike-Slip
Fault
Transcribed Image Text:Mid-Ocean Ridge Plate B Plate C ?| N Triple Junction Transform Fault Plate A Strike-Slip Fault
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