GGP - The "Global Geodynamics Project" has reached the end of its working lifetime.  All GGP activities and data are being imported into a new IAG/IFAGS service:


IGETS - "International Geodynamics and Earth Tide Service"

 IGETS management: Hartmut Wziontek (

IGETS data center: Jean-Paul Boy (


This GGP website will be available until all information has been transferred to IGETS

  IGETS data center GFZ Potsdam:  
IGETS Data Centers Data access: GFZ Potsdam Loading service: EOST Strasbourg    
EARTHQUAKE DATA Sumatra 2004 Chile 2010 Tohoku-Oki 2011  
ICET / BIM ICET Website BIM Recent Issues NEW! - volume 149 BIM Past Issues  
GGP FILES Header/Data Structure Repair Codes GGP-ICET Documents  
UTILITIES Seismic Noise Magnitude update Decimation Filters SG Phase Calibration  
CONFERENCES ETS2016: G-ET Symposium Trieste 2016 ETS2013: GWR INSTRUMENTS i Grav  
GGP Home Agreements Purpose / Goals Mailing Address / Email List Links
Newsletters Publications / Online Stations Glossary Maps

GGP, Phase 1, ran from 1 July 1997 to 1 July 2003. At the 2003 IUGG in Sapporo, GGP was officially integrated into the IAG as an Intercommision Project, reporting to Commission 3 (Earth Rotation and Geodynamics) and Commission 2 (The Gravity Field). GGP completed Phase 2 at the IUGG in Perugia, Italy, 2007, and will now continue indefinitely as an IAG Inter-Commission Project.

The purpose of GGP is twofold. Its main objective is to record the Earth's gravity field with high accuracy at a number of worldwide stations using superconducting gravimeters (SGs). Each site is visited at least twice per year with an absolute gravimeter to co-determine secular changes and check calibration. A list of publications related to GGP and SGs is available at this site, as are a number of newsletters published for the benefit of the community.

The data is used in an extensive set of studies of the Earth, ranging from global motions of the whole Earth such as the Chandler wobble to the surficial gravity effects of atmospheric pressure and groundwater. The SG stations are run independently by national groups of scientists who send data each month to the GGP Data Centre at the International Centre for Earth Tides (ICET) in Brussels. As of January 2008, ICET operations will be transferred to  Tahiti.

The second objective of GGP is to maintain standards for the deployment of all GWR SGs, including site, instrument, data acquisition, and processing guidelines for SG instruments, as acknowledged by agreements between the SG groups. For some of the GGP sites, the most recent data is temporarily restricted and will become available one or two years after collection. For other GGP sites, the data is available as soon as it has been sent to ICET, without restriction. Interested scientists can contact ICET, or the persons below, for details. Useful site links and other related information about gravimetry are also on this site.

For further information, contact David Crossley (Chairman) at, or Jacques Hinderer (Secretary) at

This Website, and the research described herein, is supported jointly by funding from NSF (National Science Foundation, USA) EAR 0409381 and CNRS (Centre National de la Recherche Scientifique, France).

EAS Department | EAS Home | Saint Louis University Home. Last updated September 7, 2010.