Earthquakes occur when movement along a fault is quick and sudden
slow and steady
slowing down

quick and sudden

Explanation:

The forces that move the plates create stresses within the Earth's crust, and can cause the crust to suddenly fracture. The area of contact between the two fractured crustal masses is called a fault. Earthquakes result from sudden movements along faults, creating a release of energy.

hope this is correct and i hope this helped have a great rest of your day :)