Transform faults I believe.

Transform faults I believe.

A transform plate boundary shears horizontally against each other. When one crust moves up, the other one moves down. A transform plate boundary produces the second worst earthquakes with (S) waves (Shear or secondary waves). Every boundary including a transform plate boundary are located on a fault.

Kinetic energy

A Transform fault boundaries are where two plates are sliding horizontally past one another. They sometimes even get stuck. the longer the time before the plates slip, the stronger the earthquake.