A shallow-dipping dike fed the 1995 flank eruption at fernandina volcano, galapagos, observed by satellite radar interferometry

Sigurjón Jónsson*, Howard Zebker, Peter Cervelli, Paul Segall, Harold Garbeil, Peter Mouginis-Mark, Scott Rowland

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

70 Scopus citations

Abstract

Satellite radar interferometry data reveal strong localized uplift in a semi- circular pattern on the southwest flank of Fernandina volcano, Galapagos, where an eruption took place in January to April, 1995. The observations show a maximum decrease in radar range of 0.75 m, and they are consistent with a model of a shallow-dipping dike intrusion feeding this fissure eruption. We solve for the best-fit single rectangular dislocation dike source using non-linear inversion techniques where simulated annealing searching algorithm is used to avoid local minima. The best-fit dike is 3.8 km long, 2.3 km high, 0.86 m thick and with a 34° dip. The total dike volume (7.5 × 10-3 km3) is ∼40% of the volume of extrusive materials estimated to have been produced during the eruption. The data do not permit a sub-vertical dike, implying that the least principal stress direction is not horizontal as is usually assumed.

Original languageEnglish (US)
Pages (from-to)1077-1080
Number of pages4
JournalGeophysical Research Letters
Volume26
Issue number8
DOIs
StatePublished - Jan 1 1999

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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