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AGU: Geophysical Research Letters

 

Index Terms

  • Geodesy and Gravity
  • Geodesy and Gravity: Instruments and techniques
  • Information Related to Geographic Region: Europe

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 28, NO. 12, PP. 2317-2320, 2001
doi:10.1029/2000GL012438

Absolute gravity measurements at UK tide gauges

Simon D. P. Williams

Proudman Oceanographic Laboratory, Bidston, United Kingdom

Trevor F. Baker

Proudman Oceanographic Laboratory, Bidston, United Kingdom

Graham Jeffries

Proudman Oceanographic Laboratory, Bidston, United Kingdom

Absolute gravity near 3 of the United Kingdom's (UK) core tide gauges was repeatedly measured using an FG5 gravimeter over a period of 3–4 years to determine vertical land movements at those gauges. The absolute gravity sites were established at Newlyn and Aberdeen in 1995 and in Lerwick in 1996. Assuming a height change of 1 mm causes a change in gravity of 0.2 µgal we see vertical land movements of 1.0±1.4 mm/yr at Newlyn, −3.8±1.6 mm/yr at Lerwick and 0.9±3.1 mm/yr at Aberdeen. These land movements are, within the error estimates, in agreement with land movement predicted by a model of post‐glacial rebound/subsidence. To ensure that our absolute gravimeter is giving accurate results it has been regularly intercompared with other absolute gravimeters and was verified to be in agreement at the 2 µgal level.

Received 5 October 2000; accepted 16 March 2001; .

Citation: Williams, S. D. P., T. F. Baker, and G. Jeffries (2001), Absolute gravity measurements at UK tide gauges, Geophys. Res. Lett., 28(12), 2317–2320, doi:10.1029/2000GL012438.

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