During October – November 2005, an episode of surface uplift (3 – 5 cm) occurred encompassing both Tanaga and Takawanga volcanoes. In addition to this broad deformation signal, small localised displacements on the southeast flank of Takawanga correspond to a region of unusual seismicity. The broad region of uplift is modelled as a pressurising magma reservoir using a point source or a shallow-dipping prolate source that is elongate in the east-west direction. The source depth is inferred to be 5 – 8 km with a volume increase of 0.002 – 0.008 km³.