Plate tectonics measured by Doris

Image of the Month - October 2017

Horizontal displacement of the Doris stations, reflecting the plate tectonique motion; some are over 5 cm/yr (Credits Cnes/CLS/IDS)

The idea that the Earth continents are moving has been mentionned during the XIXe century (by A. von Humboldt, among others), and formalized by A. Wegener in the early XXe. Now, it is not "just" an idea with indirect proofs such as the continents'contours fitting together, but something measured daily and continuously by a number of instruments all over Earth.

Doris, among other system has been doing such a monitoring for the past 27 years, and is continuing. Doris has about fifty stations all over Earth, used to track satellites on their orbits (mostly altimetry satellites, which embarked a Doris instrument for all of them since 2002 and since 1992 for the T/P-Jason series). It is fully part of the International Terrestrial Reference Frame system, which is providing precise georeferencing to all systems in need of it -- GPS, etc.

Doris will be launched on the next Sentinel-3 (B, C & D), some of the next HY-2 (C, D and E), Jason-CS / Sentinel-6 (A & B), and of course SWOT. The system should thus continues on in the next decades and more

See also

Websites on this subject

References

  • Moreaux, G.; Lemoine, F.G.; Capdeville, H.; Kuzin, S.; Otten, M.; Štěpánek, P.; Willis, P.; Ferrage, P., 2016. The International DORIS Service contribution to the 2014 realization of the International Terrestrial Reference Frame, in DORIS Special Issue: Scientific Applications of DORIS in Space Geodesy, F. Lemoine and E.J.O. Schrama (Eds.), ADVANCES IN SPACE RESEARCH, 58(12):2479-2504, DOI: 10.1016/j.asr.2015.12.021