Shear Wall Failure Mechanisms
 

Top of Wall - Centerline
 


 

 Note the misalignment of the sheathing at the top of the wall.  The top plate can be seen where the right hand panel has shifted with respect to the framing.  A gap between the two panels has also opened up.
 

A close-up of the above picture, this image provides a good example of nail pull-through - one of the failure mechanisms for this wall.