Reference : Two years of continuous measurements of tidal and nontidal variations of gravity in B...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
Physical, chemical, mathematical & earth Sciences : Physics
Two years of continuous measurements of tidal and nontidal variations of gravity in Boulder, Colorado
van Dam, Tonie mailto [NOAA/NGS and CIRES, University of Colorado, Boulder]
Francis, Olivier mailto [Observatoire Royal de Belgique, Bruxelles]
Geophysical Research Letters
American Geophysical Union
Yes (verified by ORBilu)
[en] superconducting gravity ; ocean tides ; solid earth tides
[en] We report here on the results of an analysis of 2
years of data from NOAA’s superconducting gravimeter located
at the Table Mountain Gravity Observatory in Boulder,
Colorado. Observed tidal parameters, corrected for ocean
loading effects, are compared with theoretical tidal parameters
predicted for a non-hydrostatic inelastic Earth model and
demonstrate excellent agreement. Tidal residuals, corrected for
polar motion and a linear instrument drift are highly correlated
with gravity changes measured by two absolute gravimeters
over the same time period. The admittance to local pressure i s
found to be -0.356 mGal/mbar. However, this admittance factor
is found to be seasonally and frequency dependent.
Correlations between rainfall events and gravity changes are
observed. Attempts to model these gravity changes as
exponential functions of time were unsuccessful.

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