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| Titel |
Short-period variations of the Earth's rotation rate and global deformation processes in the Lithospere |
| VerfasserIn |
V. Milyukov, A. Mironov, V. Kravchuk, A. Amoruso, L. Crescentini |
| 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 |
250061366
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| Zusammenfassung |
| Strain data recorded by two laser interferometer-strainmeters operating in the Baksan
(Northern Caucasus, Russia) and Gran Sasso (Italy) underground observatories, and the
length-of-day (LOD) data describing the variable rate of the Earth’s rotation are used to
study the relation between the deformation processes in the lithosphere and the
global geodynamics of the Earth over short time intervals. The methods applied
are based on analysis of the coherence of the studied processes, and correlation
analysis.
A significant (90%) correlation is revealed between the local deformation fields at two
remote observation stations, which proves the existence of a global (at least on
the scale of the Eurasian plate) component in the Earth’s deformation field that
manifests itself at characteristic time intervals of up to 1–2 months. At the same level of
significance, the correlation between the local deformation fields and variations in
the rate of the Earth’s rotation has also been identified. The found correlations in
the tidal low-frequency range are caused by the direct impact of the long-period
tidal loading (Mf and Mtm waves) on the lithosphere and the length-of-the-day
(LOD).
On the contrary, the significant correlation in the non-tidal range is probably linked to
irregular perturbations of the continental character, which create a coherent interference in the
studied processes. The global mechanism that causes this coherent noise requires further
study. As candidates, the atmospheric influence, the strongest earthquakes, and other global
geodynamic processes can be considered.
This work is supported by the Russian Foundation for Basic Research. |
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