For the October 2011-March 2012 eruption, and the two phases of subsequent earthquake activity, plotting has shown that in all cases the magma rose under the area of Tanganasoga. In the eruption it worked south-eastwards to near La Restinga; in the February upsurge in activity followed the same path. Modelling of ground deformation measured with radar interferometry confirmed two shallow magma reservoirs, consistent with the migration of earthquakes epicenters. The June 2012 earthquake activity had the magma moving to the west of the island, and the current (mid September) earthquake activity has shown that the magma moving south from Tanganasoga.