Ground deformation near Gada 'Ale volcano, Afar, observed by radar interferometry

Falk Amelung, Clive Oppenheimer, P. Segall, H. Zebker

Research output: Contribution to journalArticle

30 Scopus citations

Abstract

Radar interferometric measurements of ground-surface displacement using ERS data show a change in radar range, corresponding to up to 12 cm of subsidence near Gada 'Ale volcano in northern Afar, Ethiopia, that occurred between June 1993 and May 1996. This is the area of lowest topography within the Danakil Depression (-126 m). Geodetic inverse modeling and geological evidence suggest a volcanic origin of the observed deformation; it was probably caused by a combined process of magma withdrawal from a larger reservoir and normal faulting. There is no evidence of subaerial eruption. This is the only identifiable deformation event during June 1993-October 1997 in the 80 km long Erta 'Ale volcanic range, indicating surprising inactivity elsewhere in the range.

Original languageEnglish (US)
Pages (from-to)3093-3096
Number of pages4
JournalGeophysical Research Letters
Volume27
Issue number19
DOIs
StatePublished - Jan 1 2000
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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