InSAR observations performed in the years 1998 to 2000 have yielded evidence of a pattern of ground uplift centered between Lastarria and Cordón del Azufre. This pattern, also known as Lazufre, covers a surface area of . This uplift appears to be caused by the injection of magma at depth, with a pattern of progressively increasing flux between 2003 and 2006. The source of this uplift appears to lie at depths of , later recalculated at . This uplift may have been ongoing for about 400,000 years and has influenced the final position of lava flows of Lastarria and other volcanoes in the area.