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| Titel |
The gravity footprint of the Sumatra-Andaman and Nias earthquakes - detection and interpretation |
| VerfasserIn |
I. Einarsson, A. Hoechner, R. Wang, J. Kusche |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250027453
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| Zusammenfassung |
| Over four years have passed since the 2004 earthquake and tsunami offshore
Sumatra, which a few months later was followed by a large earthquake by the island
Nias. Earthquakes of this size cause mass-dislocation on such a scale, that it is
measureable by the GRACE gravity satellite mission. Furthermore, the dislocated
masses disturbs the isostasy equilibrium of the crust, thus triggering a long-term
relaxation process, the postseismic relaxation.
We discuss the problems related to identifying and separating the footprints of the
co- and postseismic gravity signals of both earthquakes. We also compare those to
predicted gravity signals by a viscoelastic model calibrated by dislocation of
GPS stations and other data. |
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