# 2011-4-6-LectureTest Review+SteadyState - strike Stress...

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Explanation for Next 3 slides In the following slides, we • choose which diagram indicates the proper ientation of the horizontal stresses relative to orientation of the horizontal stresses relative to fault strike AND oose e proper relative magnitude of the • choose the proper relative magnitude of the vertical stress amongst the three principal stresses.

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A C S Hmax Normal Faulting max S in S hmin S Hmax hmin B S Hmax D a) S vert = S 1 S hmin b) S vert = S 2 S S S hmin max c) S vert = S 3 these are all map view S Hmax
A C S Hmax Thrust Faulting max S in S hmin S Hmax hmin B S Hmax D a) S vert = S 1 S hmin b) S vert = S 2 S S S hmin max c) S vert = S 3 these are all map view S Hmax

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A C S Hmax Strike-slip Faulting max S in S hmin S Hmax hmin B S Hmax D a) S vert = S 1 S hmin b) S vert = S 2 S S S hmin max c) S vert = S 3 these are all map view S Hmax
• For the following slides, the question is which answer amongst a, b, c, and d best describes the orientation of a hydraulic fracture for the given stress regime ands for “hydraulic fracture” hf stands for hydraulic fracture 64

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Normal Faulting tress Regime a. hf strike parallel to fault

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Unformatted text preview: strike Stress Regime S ert • horizontal b. hf strike parallel to fault dip direction f horizontal vert extension • vertical c. hf is horizontal d. none of above S hmin shortening vertical oss ction 65 cross-section S vert > S Hmax > S hmin Reverse Faulting Stress egime a. hf strike parallel to fault strike Regime • vertical b. hf strike parallel to fault dip direction f horizontal S vert extension (thickening) c. hf is horizontal d. none of above S hmax • horizontal shortening vertical oss ction 67 S hmax > S hmin > S vert cross-section Strike-Slip Faulting t R i a. hf strike parallel to fault strike Stress Regime • horizontal b. hf strike parallel to fault dip direction f horizontal S hmin extension || S hmin • horizontal ortening c. hf is horizontal d. none of above S hmax shortening || S Hmax horizontal ap view 69 S hmax > S vert > S hmin map view...
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