The Global Geodynamics Project (GGP) is a proposal to monitor changes in the Earth's gravity field at periods of seconds and longer. The GGP is named to indicate the application of gravity data to the solution of a number of geodynamic problems; additionally GGP may become a source for absolute gravimeter data as well as other geodynamic data. 

The measurements will be taken over a time span of 6 years at a small number of permanent observatories where there is a superconducting gravimeter (SG) currently installed. The 6-year period has been chosen as the minimum length of data required to separate annual and 14 month Chandler wobble components in the gravity record. The Observation Period will commence July 1995. 

The SG has been, for the past two decades, the most sensitive, stable instrument for the measurement of the vertical component of the Earth's gravity field. Each of the currently operating SGs is the focus of a national effort to provide a continuous gravity record for geodetic and geophysical research. The GGP is an opportunity for the various SG groups to participate in a global campaign to monitor the gravity field and to exchange the raw data. 

Precise global measurements of the Earth's gravity field are essential to answer a number of important questions in geophysics, which we outline in more detail in the next section (a) do internal gravity waves (inertial waves if the fluid is neutrally stratified) exist in the Earth's liquid core and are their gravitational effects at the Earth's surface detectable ? (b) what is the gravity effect of the global atmospheric loading and mass re-distribution on the solid Earth ? (c) through global tidal analysis, can we refine estimates of the nearly diurnal free wobble of the Earth and models of oceanic loading on the solid Earth ? (d) what changes in gravity are associated with slow and silent earthquakes, tectonic motions, sea-level changes and post-glacial rebound ? (e) can we monitor the location of the rotation pole of the Earth on a time scale of minutes ? (f) can SG recordings of the earth's normal modes enhance the global long period seismic and spring gravimeter networks ?