Seasonal variations in the Earth's gravitational field are investigated through the analyis of LAGEOS I satellite laser ranging measurements and are compared with those produced by atmospheric mass redistribution as inferred from global surface pressure date from the National Centers for Environmental Prediction (NCEP) reanalyses.

LAGEOS↗

NASA NTRS1997

Estimating Regional Deformation from a Combination of Space and Terrestrial Geodetic Data

We discuss an approach for efficiently combining different types of geodetic data to estimate time-dependent motions of stations in a region of active deformation.

deformation analysis↗

NASA NTRS1997

Geocenter Variations Caused by Atmosphere, Ocean and Surface Groundwater

The geocenter variations reflect the global scale mass redistribution and the interaction between the solid Earth and the mass load.

geocenter variations↗

NASA NTRS1996

Predictions fo the Effect of Oceanic Density Fluctuations on the Earth's Time-Varying Gravitational Field

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horizontal redistribution redistribution perturbat↗

NASA NTRS1995

Seasonal Variations of the Earth's Gravitational Field: An Analysis of Atmospheric Pressure, Ocean Tidal, and Surface Water Excitation

Seasonal variations in the Earth's gravitational field are investigated through the analysis of LAGEOS I satellite laser ranging measurements spanning 1984 to 1992. Global surface pressure data are analyzed; a self-consistent equilibrium ocean tide model is used to compute the effect of the gravitational field on tides. Laser ranging measurements are used to model gravitational field effects.

Laser↗

NASA NTRS1994

Interannual Polar Motion and its Geophysical Contributors

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interannual polar motion↗

NASA NTRS1994

Tectonic Deformation of the Southern Coast Ranges and Santa Maria Basin, California

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GPS deformation Santa Maria basin Ventura basin↗

NASA NTRS1994

Geodetic Measurements of Four Decades of Horizontal Strain Near the White Wolf Fault, Southern California

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GPS Global Positioning System Kern County Earthqua↗

NASA NTRS1994

Variations of the Earth's Gravity Field for 1980-1992 from LAGEOS

Thirteen years of satellite laser ranging measurements to LAGEOS (1980-1992) have been analyzed to investigate the variations of the Earth's gravity field.

global gravity anomalies rotational variations↗

NASA NTRS1994

Seasonal Variations of the Earth's Gravitational Field: An Analysis of Atmospheric and Ocean Tidal Excitation

Laser ranging measurements to single satellite are sensitive to the Earth's gravitational field and its temporal variations. Using 13 years (1980-1992) of LAGEOS I laser ranging data, we have recovered monthly mean linear combinations of even and odd degree zonal spherical harmonic coefficients of the Earth's gravitational field.

ocean tides↗

NASA NTRS1994

Changes in Global Gravitational Energy Induced by Earthquakes

Besides operating its own energy budget, an earthquake acts as an agent transferring a much greater amount of energy among the Earth's rotation, elastic field, gravitational field, and internal heat.

global gravitational energy↗