Project Results Cont.
Rotation
Below are contour maps of rotation during orogenesis. Rotation is calculated using the following formula:

w = 0.5(dDx/dy - dDy/dx)

Positive w indicates clockwise rotation whereas negative w indicates counterclockwise rotation.
Epoch 1: Time step between photos 1 and 2. Note that there is a broad region at the toe of the wedge that is undergoing clockwise rotation prior to the collision with the terrane. Velocity displacement vectors are indicated by the arrows.
Epoch 2: Time step between photos 2 and 3. Note that the toe of the wedge is still experiencing clockwise rotation, whereas portions of the terrane are experiencing minor counterclockwise rotation. Velocity displacement vectors are indicated by the arrows.
Epoch 3: Time step between photos 3 and 4. Note that the toe of the wedge is still undergoing clockwise rotation and the terrane is still undergoing slight counterclockwise rotation. Velocity displacement vectors are indicated by the arrows.
Epoch 4: Time step between photos 4 and 5. Note that the terrane is still undergoing a counterclockwise rotation and the overriding wedge is experiencing a slight clockwise rotation. Velocity displacement vectors are indicated by the arrows.
Epoch 5: Time step between photos 5 and 6. The same overall pattern persists as before. Velocity displacement vectors are indicated by the arrows.
Epoch 6: Time step between photos 6 and 7. The same overall pattern is evident, with actively deforming regions undergoing clockwise rotation. Velocity displacement vectors are indicated by the arrows.
Epoch 7: Time step between photos 7 and 8. Note that there is a broad region near the deformation front which is undergoing clockwise rotation. Velocity displacement vectors indicated by the arrows.
Epoch 8: The final state of strain. Note that the actively deforming region at the toe of the orogen is undergoing clockwise rotation, as is the case for all other epochs. Velocity displacement vectors are indicated by the arrows.
Rotation