Respuesta :

-Most of them happen around plate boundaries.
-The crust begins to break when the forces of the plate motion something like push or pull the crust so much. 
"Most faults occur along plate boundaries, where the forces of plate motion push or pull the crust so much that the crust breaks. There are three main types of faults: normal faults, reverse faults, and strike-slip faults." 
Not mine. But I wanted to help you. Hope this helps and take care.