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The Potential of GOCE in Constraining the Structure of the Crust and Lithosphere from Post-Glacial Rebound

  • L. L. A. Vermeersen
Chapter
Part of the Space Sciences Series of ISSI book series (SSSI, volume 17)

Abstract

Glacial Isostatic Adjustment (GIA) due to Pleistocene glaeiation and deglaciation lias left clear imprints in the present-day geoid. The solid-earth models that are commonly used in simulating these geoid anomalies usually have the upper layer (crust/lithosphere) clastic. While this is a good approximation for oceanic litliosphere, it is over-simplified for many continental crustal areas, of which some are submerged at continental margins. At many places, these continental areas have a lower crustal zone that has low viscosities. Also at the top of the mantle (asthenosphere) such zones with low viscosities can exist.

Modeling results show that, due to their shallowness and due to the laterally non-homogeneous water load, these low-viscosity layers induce discernible signatures in the high-harmonic steady-state components of the geoid. These patchlike patterns have typical length scalcs ranging from about 100 – 1000 km, and typical magnitudes of 1 cm – 1 m, depending on, a.o., depth and width of the low-viscosity zone, viscosity and shoreline geometry.

Complications in correlating GIA modeling results with observed geoid anomalies might arise from uncertainties in isostatic corrections (topography and non-uniform composition of crust and litliosphere) and from other non-GIA related contributions to the observered anomalies. The characteristic forms of the patterns might assist in separating the various contributions to the observed geoid anomalies. This can be illustrated for the Adriatic coast of Italy, where the best fit to the spatial sca-levcl curve pattern is provided by a combination of GIA and regional plate tcctonics.

Keywords

crust geoid GOCE litliosphere low-viscosity solid-Earth zones post-glacial rebound shallow solid-Earth structure 

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References

  1. Crough. S.T. and Jurdy, D.M.: 1980, Subducted tithosphcre, hotspots, and the geoid, Earth Planet. Sci Lett., 48, 15 - 22.Google Scholar
  2. Di Donato, G., Mitrovica, J.X., Sabadini, R. and Vermeersen, L.L.A.: 2000a, The influence of a ductile crustal zone on glacial isostatic adjustment: Geodetic observables along the U.S. East Coast, Geophys. Res. Lett., 27, 3,017-3, 020.Google Scholar
  3. Di Donato, G., Negredo, A.M., Sabadini, R, and Vermeersen, L.L.A.: 1999, Multiple processes causing sea level rise in the central Mediterranean, Geophys. Res. Lett.. 26, 1,769-1, 772.Google Scholar
  4. Di Donato, G., Vermeersen, L.L.A. and Sabadini, R.: 2000b, Sea-level changes, geoid and gravity anomalies due to Plcistoccne dcglaciation by means of multilaycrcd. analytical Earth models, Tectonophvs.. 320, 409 - 418.Google Scholar
  5. Dziewonski, A.M. and Anderson, D.L.: 1981, Preliminary reference Earth model (PREM), Phys. Earth Planet. Inter.. 25, 297 - 356.CrossRefGoogle Scholar
  6. Heiskanen, W.A. and Veiling Mcinesz, F.A,, The Earth and its Gravity Field, McGraw-Hill, New York, 1958.Google Scholar
  7. Kaufmann, G.: 2000, Ice-ocean mass balance during the Late Pleistocene glacial cyclcs in view of CHAMP and GRACE satellite missions, Geophys. J. Int., 143, 142 - 156.CrossRefGoogle Scholar
  8. Mitrovica, i.X, and Peltier, W.R.; 1989, Pleistocene deglaciation and the global gravity field,,/, Geophys. Res., 94, 13,651-13, 671.Google Scholar
  9. Peltier, W.R., Forte, A.M., Mitrovica, J.X. and Dziewonski, A.M.: 1992, Earth's gravitational field: Scismic tomography resolves the enigma of the Laurentian anomaly, Geophys, Res. Lett., 19, 1, 555 - 1, 558.Google Scholar
  10. Ricard, Y., Fleitout, L. and Froidevaux, C.: 1984, Geoid heights and lithospheric stresses for a dynamic Earth. Ann. Geophys., 2. 267 - 286.Google Scholar
  11. Richards, M.A. and Hager, B.H.: 1984, Geoid anomalies in a dynamic earth, J. Geophys. Res., 89, 5,987-6, 002.Google Scholar
  12. Shell, Z.-K., Jackson, D.D., Feng, Y„ Cline, M„ Kim, M„ Fang, P. and Bock, Y.: 1994, Postseismic deformation following the 1992 Landers earthquake. Seism. Soc. Am. Bull., 84, 780 - 791.Google Scholar
  13. Simons, M. and Hager, B.H.: 1997, Localization of the gravity field and the signature of glacial rebound, Nature, 390, 500 - 504.CrossRefGoogle Scholar
  14. Ter Voorde, M„ Van Balen. R.T., Bcrtotti, G. and Cloetingh, S.A.P.L.: 1998, The influence of a stratified rheology on the llcxural response of the lithosphcrc to (un)loading by extensions! faulting, Geophys. J. Int., 134, 721 - 735.CrossRefGoogle Scholar
  15. Tureotte, D.L. and Schubert, D.L., Geodynamics: Applications of Continuum Physics to Geological Problems, John Wiley Sons, New York. 1982.Google Scholar
  16. Tushingham, A.M. and Peltier, W.R.; 1991, ICE-3G: A new global model of late Pleistocene deglaciation based upon geophysical predications of postglacial relative sea level change, J. Geophys. Res., 96, 4. 497 - 523.Google Scholar
  17. Vermeersen, L.L.A., Founder, A. and Sabadini, R.: 1997, Changes in rotation ituluccd by Plcistoccnc ice masses with stratified analytical Earth models,,/, Geophys. Res., 102, 27,689-27, 702.Google Scholar
  18. Vermeersen, L.L.A. and Sabadini, R.: 1997, A new class of stratified viscoelastic models by analytical techniques, Geophys. J. Int., 129, 531 - 570.CrossRefGoogle Scholar
  19. Visser, P.N.A.M, Rummel, R.. Balm ino, G., Sùnkel, H,, Jobannessen, J., Aguirre, M.. Wood worth, PL., Le Provost, C., Tscheming, C.C. and Sabadini, R.: 2002, The European Earth explorer mission GOCE: Impact for the geosciences, in: Ice Sheets, Sea Level and the Dynamic Earth, J.X. Mitrovica and L.L.A, Vermeersen (eds), AGI! Geodynamics Series. 29, American Geophysical Union, Washington, 95 - 107.CrossRefGoogle Scholar
  20. Wahr, J.M. and Davis, J.L.: 2002, Geodetic constraints on glacial isostatic adjustment, in: Ice Sheets. Sea Level and the Dynamic Earth, J.X. Mitrovica and L.L.A. Vermeersen (cds), AGU Geodynamics Series, 29. American Geophysical Union, Washington, 3-32,Google Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2003

Authors and Affiliations

  • L. L. A. Vermeersen
    • 1
  1. 1.Delft Institute for Earth-Oriented Space ResearchDelft University of TechnologyDelftThe Netherlands

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