The deformation field of the August 2003 eruption at Piton de la Fournaise, Reunion Island, mapped by ASAR interferometry
| Autor: | Thomas Staudacher, Jean-Luc Froger, T. Souriot, Nicolas Villeneuve, Yo Fukushima, Pierre Briole |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Flank
geography geography.geographical_feature_category INTERFEROMETRIE Field (physics) Deformation (mechanics) TELEDETECTION SPATIALE TOPOGRAPHIE RADAR MODELISATION Overpressure CRATERE Intrusion Interferometry VOLCAN Geophysics ERUPTION VOLCANIQUE Impact crater Volcano General Earth and Planetary Sciences Geology Seismology |
| Zdroj: | Geophysical Research Letters. 31 |
| ISSN: | 0094-8276 |
| Popis: | [1] Three independent ASAR interferograms spanning the August 2003 Piton de la Fournaise eruption, reveal a 3 by 3 km asymmetric pattern of range changes centred on the Dolomieu crater northern flank. It corresponds to 30 cm of displacement towards the satellite east of the eruptive fissures and 7 cm away from the satellite west of the fissures. Displacements are caused by dyke emplacement below fissures. We model the deformation using a 3D mixed boundary element method for elastic media. This consists of a dyke defined by six geometric parameters and an overpressure gradient. A neighbourhood algorithm was applied to explore this 7 dimensional parameter space. The best-fit model is a 57° eastward dipping dyke with a base lying around 1520 m a.s.l. The model provides new evidence of the dyke intrusion – related seaward displacements of the volcano eastern flank. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text