Discussion
The three principal stresses Sv, SH and Sh represent the magnitudes of vertical component of stress, maximum horizontal stress and minimum horizontal stress. According to Anderson's faulting theory, a strike-slip fault movement may be inferred if :
Answer: C
A strike-slip fault is inferred when \(S_{H} \gt S_{v} \gt S_{h}\).
Anderson's theory takes one principal stress to be vertical, since the Earth's surface carries no shear stress, and says that faults form in the plane containing the intermediate stress. So the type of fault depends on which stress is vertical:
- \(S_{v}\) greatest (\(S_{v} \gt S_{H} \gt S_{h}\)): normal fault.
- \(S_{v}\) intermediate (\(S_{H} \gt S_{v} \gt S_{h}\)): strike-slip fault.
- \(S_{v}\) least (\(S_{H} \gt S_{h} \gt S_{v}\)): reverse or thrust fault.
So the first option describes thrusting and the fourth normal faulting. The second is impossible, since \(S_{h}\) is by definition the smaller horizontal stress.
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