The deformation field of the August 2003 eruption at Piton de la Fournaise, Reunion Island, mapped by ASAR interferometry

J. L. Froger, Y. Fukushima, P. Briole, T. Staudacher, T. Souriot, N. Villeneuve

Research output: Contribution to journalArticlepeer-review

72 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)L14601 1-5
JournalGeophysical Research Letters
Volume31
Issue number14
DOIs
Publication statusPublished - 2004 Jul 28
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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