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| Titel |
Checking the validity of superimposing analytical deformation models |
| VerfasserIn |
Karen Pascal, Jurgen Neuberg, Eleonora Rivalta |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250052645
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| Zusammenfassung |
| The displacement field due to magma movements in the subsurface is commonly modelled
using the solutions for a point source (Mogi, 1958), a finite spherical source (McTigue,
1987), or a dislocation source (Okada, 1992) embedded in a homogeneous elastic
half-space. When the magmatic system is represented by several sources, their respective
deformation fields are summed, and the assumption of homogeneity in the half-space is
violated.
We have investigated the effects of neglecting the interaction between sources on the
surface deformation field. To do so, we calculated the vertical and horizontal displacements
for models with adjacent sources and we tested them against the solutions of corresponding
numerical 3D finite element models. We implemented several models combining
spherical pressure sources and dislocation sources, varying the pressure and the
relative position of the sources. As examples we also considered models adapted from
Soufrière Hills Volcano (Montserrat, West Indies) and the Dabbahu rift segment (Afar,
Ethiopia).
For certain conditions, we found combining analytical sources can cause an error of up to
300%, mostly due to the source spacing. For the error to be neglected ( |
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