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FORWARD AND INVERSE MODELLING OF GPS OBSERVATIONS FROM FENNOSCANDIA

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FORWARD AND INVERSE MODELLING OF GPS OBSERVATIONS FROM FENNOSCANDIA. G.A. Milne 1 , J.X. Mitrovica 2 , H.-G. Scherneck 3 , J.L. Davis 4 , J.M. Johansson 3 , H. Koivula 5 , M. Vermeer 6. 1 Dept. of Geological Sciences, University of Durham, UK 2 Dept. of Physics, University of Toronto, Canada

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slide1
FORWARD AND INVERSE MODELLING OF GPS OBSERVATIONS FROM FENNOSCANDIA

G.A. Milne1, J.X. Mitrovica2, H.-G. Scherneck3, J.L. Davis4, J.M. Johansson3, H. Koivula5, M. Vermeer6

1 Dept. of Geological Sciences, University of Durham, UK

2 Dept. of Physics, University of Toronto, Canada

3 Onsala Space Observatory, Sweden

4 Harvard-Smithsonian Center for Astrophysics, USA

5 Finish Geodetic Institute, Finland

6 Institute of Geodesy, Helsinki University of Technology, Finland

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BASELINE INFERENCES FOR FENNOSCANDIAN REBOUND OBSERVATIONS SEA LEVEL AND TECTONICS
  • Apply GPS to observe the present-day deformation field in Fennoscandia.
  • Employ observations to: (1) Infer GIA model parameters. (2) Estimate secular height shift of geoid. (3) Examine importance of neotectonic processes.
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GIA MODEL

Earth Rheology

Earth Forcing

Impulse response formalism

Linear Maxwell rheology

Compressible

1D structure

Rotational potential

Surface loading

Euler equations

Ocean

Ice

Sea-level equation

ICE-3G(Tushingham & Peltier, 1991)

FENN+BARENTS (Lambeck et al., 1998)

  • Time-dependent ocean function
  • Near-field water influx
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SUMMARY

● Forward modelling shows:

(1) FENN+BARENTS ice model produces significantly better fit compared to ICE-3G.

(2) Viscosity inference relatively insensitive to ice model.

(3) GIA model can account for most of observed signal.

● Inverse modelling shows:

(1) Depth sensitivity to viscosity is site dependent.

(2) Data can resolve two-layer upper mantle structure and a lower mantle layer to a depth of ~1200 km.

● Residual signal to be explored further:

(1) Neotectonics.

(2) Dynamic ice models.

(3) Lateral variations in earth structure.

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