Contents of 12.7 How do we know ... that plates move in real time?

Image of data from a GPS station in Wisconsin showing plate motion.

12.7 How do we know ... that plates move in real time?

Fig 12.39

GPS data from a station in Wisconsin. From 1994 to 2004, it moved south by ~2.5 cm and west by 15 cm. This means a net plate motion of 1.5 cm/yr WSW.