This photo shows a Divergent fault line.

A divergent fault line occurs on a divergent boundary. This happens when two plates are moving in an opposite direction. The space inbetween the seperated crust is called a ridge. When the fault line was created many many years ago, magma would have crept up and cooled, making new crust in the form of a ridge.

 

Photo Cited:

Carter, F. M. (2011, May 02). Earthquakes, Tsunamis and Liquefaction. Retrieved January 18, 2017, from https://fionamariecarter.wordpress.com/2011/04/20/earthquakes/