This is a superb example of how geology fault lines can create what are considered horst and graben areas on a very small scale.
Horsts are the higher, uplifted or not sunk areas. Grabens are the lower or not raised up areas.
Horst and graben systems are usually considered to be the geological explanation for ridge and valley areas or mountain and valley systems.
Horst and Graben fault, Iran
Horsts and grabens system
Malta geology: horst and graben features
Could some other force or process have created the fault lines, the high and low blocks of land (the horsts and grabens)? Especially on the limestone islands of Malta and Gozo?