Glacial isostatic adjustment in Fennoscandia for a laterally heterogeneous earth

Details Glacial isostatic adjustment in Fennoscandia for a laterally heterogeneous earth Glacial isostatic adjustment in Fennoscandia for a laterally heterogeneous earth

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000geoji.143..262k&link_type=abstract

Geophysical Journal International, Volume 143, Issue 1, pp. 262-273.

Astronomy and Astrophysics

Astronomy

25

Asthenosphere, Fennoscandia, Lateral Heterogeneity, Lithosphere, Postglacial Rebound

Scientific paper

Glaciation and deglaciation in Fennoscandia during the last glacial cycles has significantly perturbed the Earth's equilibrium figure. Changes in the Earth's solid and geoidal surfaces due to external and internal mass redistributions are recorded in sequences of ancient coastlines, now either submerged or uplifted, and are still visible in observations of present-day motions of the surface and glacially induced anomalies in the Earth's gravitational field. These observations become increasingly sophisticated with the availability of GPS measurements and new satellite gravity missions. Observational evidence of the mass changes is widely used to constrain the radial viscosity structure of the Earth's mantle. However, lateral changes in earth model properties are usually not taken into account, as most global models of glacial isostatic adjustment assume radial symmetry for the earth model. This simplifying assumption contrasts with seismological evidence of significant lateral variations in the Earth's crust and upper mantle throughout the Fennoscandian region. We compare predictions of glacial isostatic adjustment based on an ice model over the Fennoscandian region for the last glacial cycle for both radially symmetric and fully 3-D earth models. Our results clearly reveal the importance of lateral variations in lithospheric thickness and asthenospheric viscosity for glacially induced model predictions. Relative sea-level predictions can differ by up to 10-20m, uplift rate predictions by 1-3mmyr-1 and free-air gravity anomaly predictions by 2-4mGal when a realistic 3-D earth structure as proposed by seismic modelling is taken into account.

Affiliated with

Also associated with

No associations

Rating

Glacial isostatic adjustment in Fennoscandia for a laterally heterogeneous earth does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Glacial isostatic adjustment in Fennoscandia for a laterally heterogeneous earth, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Glacial isostatic adjustment in Fennoscandia for a laterally heterogeneous earth will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-868666