Ground uplift has been detected at Lastarria itself, amounting to . The uplifting region is wide, smaller than Lazufre. The Lastarria uplift started later than the Lazufre uplift and may be influenced by the latter. Possibly, magma injected into a Lazufre magma chamber is influencing the Lastarria hydrothermal system, with changes in fumarole output observed in 2006-2012. Modelling indicates that the source of this uplift lies at a depth of about and has the shape of a sphere. Another estimate places the source inside the volcanic edifice and assumes a size of , with the volume increasing by about .