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| Titel |
Solid-Earth Processes and Secular Geocenter Motion |
| VerfasserIn |
V. Klemann, Z. Martinec |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250063016
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| Zusammenfassung |
| In this talk, we will discuss the glacial isostatic adjustment (GIA) contribution to the
geocenter motion (GCM) which is presently assumed to be the largest contribution to the
secular motion of the center of mass of the Earth against the center of figure of the
Earth.
The predicted GIA contribution ranges by one order in amplitude from 0.1
to 1.0Â mm/yr, depending on the considered rheological structure of the earth’s
mantle, but is quite robustly directed towards Laurentide pointing inward. It means
that in spite of the amplitude of the GIA-induced GCM its direction is predicted
quite accurately. In comparison to observations, the amplitude of secular GCM
is by a factor of 100 smaller than the observed periodic GCM which is mainly
induced by surface-mass transport processes. Furthermore, the secular motion is
presently determined with an accuracy of ±Â 1 mm/yr and, so, an improvement
by one order of magnitude is demanded to relate the observations to solid earth
processes.
One further aspect which has to be discussed is the integral formulation for
the prediction of the GCM opposing the non-uniform station distribution for its
observation. |
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