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Surface deformation at Nyamuragira Volcano, DRC measured by L- and C-band InSAR

Geoff Wadge(1) and Andy Toombs(1)

(1) University of Reading, 3 Earley Gate, Whiteknights, Reading RG6 6AL, United Kingdom

Abstract

Nyamuragira is Africa’s most active volcano, with large flank eruptions of lava, on average, every two years. However, there is currently no ground-based geodetic monitoring programme to help understand the shallow deformation processes associated with this activity, and thus InSAR has a major role to play. The signals from C-band InSAR (ERS, Envisat) are largely restricted to the lava flowfields. Deformation over parts of the volcano covered by forest is only revealed by L-band InSAR (Palsar). InSAR studies to date show that: some flank eruptions have major surface displacements, (dykes/fissures) for example in 2006, whilst others do not, as in 2004; there is no pattern of strong inter-eruption inflation, nor is there a caldera-wide deformation field of the same magnitude as that measured by ground survey during the 1980s. We are working on the removal of the lava flow subsidence signal which obscures any wider deformation field and on how the active rift-related faulting affects the volcano.

 

 

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