At least two sources are considered to represent permanent zones of magma storage given their persistent or recurrent activity. Elastic deformation models indicate the presence of a flat-topped magma reservoir at ∼1.1 km below sea level and an oblate-spheroid cavity at ∼4.9 km b.s.l. The two reservoirs are hydraulically connected. Ref 1.
Fernandina exhibits a semi-circular fringe pattern on its southwest flank (Fig. 1), which has been modelled with a dipping, radial dyke coincident with the 1995 eruption⁶. Uplift of 0.1 m from September 1998 to March 1999 suggests refilling of a shallow magma chamber. Ref 2