International Terrestrial Reference System and Frame

New ITRF solutions are produced every few years, using the latest mathematical and surveying techniques to attempt to realize the ITRS as precisely as possible.

[1] The ITRS and ITRF solutions are maintained by the International Earth Rotation and Reference Systems Service (IERS).

7910 8998 This version introduces extra parameters to describe the year-periodic motion of the stations: A (amplitude) and φ (phase) per-axis.

This sort of seasonal variation has an amplitude of around 1 cm and is attributed to non-tidal loading effects (e.g. the shifting weight of water).

[9] On 7 January 2024 move to IGS20 happened, so WGS 84 is now aligned with ITRF2020, including PSD (post-seismic deformation), also called G2296.