2011-3-7-Faults and folds

2011-3-7-Faults and folds - Svert Shmin vertical...

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Unformatted text preview: Svert Shmin vertical cross-section SHmax acts out of plane 63 Normal Faults - Stress a. parallel to fault strike b. parallel to fault dip di direction c. horizontal d. none of above of above Svert Shmin • horizontal extension • vertical shortening Svert > SHmax > Shmin vertical cross-section 64 Svert SHmax Shmin acts out of plane vertical cross-section 65 Reverse Faults - Stress a. parallel to fault strike b. parallel to fault dip di direction c. horizontal d. none of above of above Svert Shmax • vertical extension (thickening) • horizontal shortening Shmax > Shmin > Svert vertical cross-section 66 Map View, Vertical Fault Shmin Shmax • horizontal extension • horizontal shortening horizontal map view view 67 Strike-Slip Faults Stress • horizontal extension extension |||| Shmin • horizontal shortening | Shmin shortening ||| SHmax Shmax Shmax > Svert > Shmin a. parallel to fault strike b. parallel to fault dip di horizontal direction c. horizontal map view view d. none of above 68 Interpreting faults in Monterey Fm, California (Offset bedding) offshore core onshore outcrop 69 Faults are Shear Fract Fractures Slip Vector Vec 70 Bristol Channel, England Faults are Shear Fract Fractures Hanging Wall Footwall 71 Bristol Channel, England Faults are Shear Fract Fractures Hanging Wall Footwall horizontal stretching = extension 72 Bristol Channel, England Normal Fault with Basin Shaped Fold in Hanging Wall Fold in Hanging Wall shear sense = normal Foot Wall Hanging Wall Wall Slip vector Fault Plane Bedding 73 Fault drag & shale smear 74 Fault Drag 75 Ductile Deformation = Folding Sheep Mtn anticline, WY Folding – Anticlines and Synclines Folding – Plunging and Non-plunging Folds Folding – Plunging Folds Axial Trace of Plunging Anticline* * Note Landers Oil Field on crest of anticline on crest of anticline Kurt N. Coonstenius ...
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2011-3-7-Faults and folds - Svert Shmin vertical...

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