Tilt Meter

A tilt-meter measures small changes in the inclination of the ground or a structure, resolving angular tilt to microradian level. In geodesy and geophysics it tracks crustal deformation, volcanic inflation, fault creep, and subsidence by detecting how the surface slope changes over time. Borehole and platform tilt-meters monitor reservoir compaction and dam or jetty stability. Output is reported in microradians or arc-seconds, where one microradian is about a 1 mm rise over a 1 km baseline. Tilt records complement GNSS and InSAR by capturing rapid local deformation that broader geodetic networks sample too coarsely.