About Time Variations of Gravity

• Main Authors: Melchior, P., van Dam, Tonie, Francis, Olivier, d'Oreye, N.
• Format: Book Part
• Language: English
• Published: American Geophysical Union 2001
• Subjects: European center for geodynamics and seismology (ECGS); Free-fall instruments; Gravity; Infer ice mass; Tidal gravimetry; Walferdange underground laboratory of geodynamics (WULG); Physical; chemical; mathematical & earth Sciences; Earth sciences & physical geography; Physique; chimie; mathématiques & sciences de la terre; Sciences de la terre & géographie physique; Greenland
• Online Access: https://orbilu.uni.lu/handle/10993/2249; https://doi.org/10.1029/CS007p0198

peer reviewed Advances in gravity instrumentation have allowed for the determination of the absolute acceleration of gravity to a precision of 3–5 μGal and observations of tidally driven changes in gravity on the order of nanogals. With observations of gravity and changes in gravity at these levels of precision we are able to investigate problems such as the resonance of the Earth's liquid inner core, to discriminate between the various ocean tidal models, understand the effects of atmospheric pressure loading on gravity observations, and perhaps to measure ice mass changes in Greenland. In this paper, we report on some of our results using absolute and superconducting gravimeter data. We describe a project to establish a site for international comparisons of absolute gravimeters in Luxembourg.