STRIKE SLIP FAULTS

Strike-Slip faults= wrench faults  

Anderson's Classification

        2 is vertical, s1 and 3 are horizontal.

        3 bisects the obtuse angle

STRIKE-SLIP FAULTS

      Displace rock units along strike

    Steeply dipping faults

    Horizontal displacement                                        

STRIKE SLIP FAULT SYSTEMS:

   Sinistral- left lateral  

    Dextral- right lateral

Riedel Shears- subsidiary strike slip shear fractures

set of conjugate shear fractures (R,R�) that develop in strike-slip fault systems

   R- synthetic faults

   R�- antithetic faults

   P-throughcutting; link R,R�

En Echelon Faults-

   sub-parallel, offset faults

Imbricate Fans-

   subsidiary faults

   sole into a master fault

Duplexes-

   occur at fault bends/stepovers

    2 master faults bound structure

   Link subsidiary faults

   Transtension or transpression

Flower Structures                             

    Positive (Palm Tree)- Transpression

Negative (Tulip) structure-  transtension

Restraining Bends-      

      transpressional zones  

      occurring at fault bends

       Push Up Ridges

Releasing Bends-

   transtensional zones

   occur at fault bends       

   Pull Apart Basins  

Major Settings:

1.

1.Transcurrent Faults-

    Regional strike slip faults

    Occur in continental crust

    Not at plate boundaries

2.Tear Faults-                

   Relatively small scale

   Local strike-slip faults

   Link other fault or fold systems  

3.Transform Faults-

  Major strike slip faults       

        Occur at plate boundaries

      Mid Ocean Ridge

       San Andreas Fault

            Figure courtesy of USGS

  Strike Slip Fault Examples:

      San Andreas Fault System  

Figures courtesy of USGS

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