What unit of measurement is used to measure the movement of the plates?

Answer 1

The movement of techtonic plates is measured by the use of repeated satellite image comparisons. Therefor you are using latitudes and longitudes, inches, meters, miles, kilometers, etc.

Answer 2

The movement of plates is measured in units of distance, typically using centimeters (cm) or millimeters (mm). It is measured using techniques such as GPS (Global Positioning System) or satellite-based radar interferometry.