Page "Transform fault" Paragraph 24

Constant length faults: In other cases, transform faults will remain at a constant length.

This consistency can be attributed to many different reasons.

In the case of a ridge-to-ridge transforms, it is caused by the continuous growth by both ridges outward, canceling any change in length.

The opposite occurs when a ridge linked to a subducting plate, where all the lithosphere ( new sea floor ) being created by the ridge is being subducted, or swallowed up, by the subduction zone.

Finally, when two upper subduction plates are linked there is no change in length.

This is due to the plates moving parallel with each other and no new lithosphere is being created to change that length.