The Haiti earthquake of 2010 was caused by movement along the Enriquillo-Plantain Garden fault zone, a transform fault that separates the North American Plate and the Caribbean Plate.

Here's a breakdown:

* Transform fault: This type of fault is where two plates slide past each other horizontally.

* North American Plate: This plate includes North America, Greenland, and part of northeastern Siberia.

* Caribbean Plate: This plate includes most of the Caribbean islands, as well as parts of Central and South America.

The Haiti earthquake occurred when the North American Plate moved westward relative to the Caribbean Plate. This movement caused a slip along the Enriquillo-Plantain Garden fault zone, releasing a massive amount of energy that resulted in the devastating earthquake.