Crustal Deformation, or Geodetic Data
Geodetic data is used to determine the crustal deformation and its potential effect on the faults.
In some cases, crustal deformation can yield information about the existence of faults that do not crop out at the surface, or of location and extent of faults that dip shallowly for long distances beneath the crust (as with subduction zones).
Crustal deformation rate can be used to estimate recurrence on faults. This is important when no occurrence or slip rate information is available from the usual geologic studies.
Also, when rates from the usual geologic studies conflict with recurrence rates determined from crustal deformation, this may be a sign that the tectonic regime may have changed since the time of the older geologic information.