A comparison of VLBI data with the Ice‐3G Glacial Rebound Model

James, Thomas S.; Lambert, A.

doi:10.1029/93gl00865

Cited by 77 publications

(48 citation statements)

References 6 publications

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“…Thus, the systematic pattern of tangential velocities radiating outward from the uplift centres can be difficult to separate from plate tectonic motion (James and Lambert, 1993;Argus et al, 1999). GPS offers the currently most cost-efficient method to tailor dense observation networks for continuous monitoring.…”

Section: Introductionmentioning

confidence: 99%

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BIFROST project: 3-D crustal deformation rates derived from GPS confirm postglacial rebound in Fennoscandia

et al. 2014

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Since autumn 1993 the BIFROST project has provided daily GPS solutions of geodetic positions from a network of more than 40 stations covering a large area of the Baltic shield. This area is expected to show large vertical motion due to glacial isostatic rebound following the deglaciation at the end of the Pleistocene. This paper will discuss the inference of three-dimensional rates of crustal motion at the GPS stations with respect to (1) a plate-fixed average for the horizontal components; (2) a geocentric reference in order to infer absolute changes of sea level from vertical crustal motion and models of geoidal rebound. We show that the horizontal strain rate pattern is largely dominated by unilateral extension and not exhibiting horizontal shear to an important extent. In regard to the vertical motion a crucial issue is the stability of the geocentre in the GPS frame. We show results from an Empirical Orthogonal Function analysis that attenuates regionally correlated noise. In all components our observations suggest reasonably close agreement with forward computions on the basis of postglacial isostatic adjustment. A dominant tectonic signal would lead to a certain fraction of the batch of baselines to exhibit shortening. A tectonic process leading to a similar pattern of horizontal motion as expected from postglacial rebound can safely be dismissed in the context of the currently accepted plate tectonic setting. Thus, our baseline rate comparison will be a critical first order test of the prevailing style of deformation.

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Section: Introductionmentioning

confidence: 99%

“…Many space geodetic techniques have the sensitivity to recover horizontal deformation components due to post-glacial rebound (James and Lambert, 1993;Mitrovica et al, 1993;Argus et al, 1999;Campbell and Nothnagel, 2000;Haas et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

BIFROST project: 3-D crustal deformation rates derived from GPS confirm postglacial rebound in Fennoscandia

et al. 2014

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“…Our results based on ARC3+ANT4b indicate that the predicted deformation fields are very sensitive to the lower mantle viscosity (see also Mitrovica et al, 1994b). James and Lambert (1993) have predicted the crustal motions due to postglacial rebound, and suggested that horizontal motions are much sensitive to the mantle viscosity than radial motions. Our conclusion, however, indicates that spatial variations and amplitudes of both horizontal and vertical crustal motions are equally sensitive to the viscosity structure of the mantle.…”

Section: Discussionmentioning

confidence: 85%

Effects of water load on geophysical signals due to glacial rebound and implications for mantle viscosity

Okuno

Nakada

2014

Earth Planet Sp

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We investigate the effects of the ocean function on predictions of the sea-level changes and other geophysical signals due to glacial rebound. To precisely predict these signals, a realistic ocean function including the effects of the palaeotopography, the distribution of ice sheet and meltwater influx is required. The adoption of a precise ocean function is very important in simulating the observables in Hudson Bay for an earth model with a low lower mantle viscosity of ∼10 21 Pa s. In this case, the contribution from water loads can be comparable to that from ice loads. In the Fennoscandian region, however, the predictions are less sensitive to the details of the ocean function, because the width of the Gulf of Bothnia is very small compared with that of Hudson Bay. With an assumption that the ice model is represented by ARC3+ANT4b, we have examined the viscosity structure using relative sea-levels, gravity anomaly and solid surface gravity changes in North America and northern Europe. This study suggests a lower mantle viscosity of greater than 10 22 Pa s and a upper mantle viscosity of (4 ∼ 10) × 10 20 Pa s.

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“…There have been recent studies comparing VLBI measurements at northern latitude sites with the expected signals from post glacial rebound. Tushingham [1991] discusses the effects to be expected and Mitrovica et al [1993], James andLambert [1993], andMiirovica et al [1994] all report on the comparison of VLBI measurements with the signals both in the horizontal and vertical directions expected from post glacial rebound. All of these studies indicate that the precision in height rates of change or of baseline length rates of the change is not yet sufficient to make any definitive statements about the current accuracy of post glacial rebound models.…”

Section: Global Sea Level and Post Glacial Reboundmentioning

confidence: 99%

VLBI data, acquisition, environmental effects

Herring¹

1995

Reviews of Geophysics

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During this quadrennium, very long baseline interferometry (VLBI) data acquisition and system development has focused on improving the accuracy of the system sufficiently to allow the determination of reliable estimates of height variations. Associated with this aim has been improvements in the determinations of horizontal velocity fields, monitoring water vapor delay using interferometric methods, and improvements to Earth rotation measurements. The primary aims of the improvements to height measurement accuracy have been to directly measure the contemporary magnitudes of post glacial rebound, and to determine a height reference system for measuring global sea level rise. High frequency Earth rotation studies have been carried out to better define the transformation parameters from an inertial coordinate system to an Earth fixed one, and to better understand the coupling between the components of the atmosphere‐ocean‐solid Earth system. Two major VLBI campaigns were carried out in support of these studies: (1) Epoch‐92 in July 1992 and (2) Cont‐94 in January 1994. Each of these campaigns lasted approximately two‐weeks and involved multiple VLBI networks operating simultaneously in addition to other space geodetic systems operating during these periods.

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A comparison of VLBI data with the Ice‐3G Glacial Rebound Model

Cited by 77 publications

References 6 publications

BIFROST project: 3-D crustal deformation rates derived from GPS confirm postglacial rebound in Fennoscandia

BIFROST project: 3-D crustal deformation rates derived from GPS confirm postglacial rebound in Fennoscandia

Effects of water load on geophysical signals due to glacial rebound and implications for mantle viscosity

VLBI data, acquisition, environmental effects

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