A major sector collapse occurred on the western flank of the edifice , with the deposit formed by the collapse extending west from it . Debris from the collapse flowed for into the Salar de San Martin/Salar de Carcote , which slowed down the landslide . Only the distal sector of the collapse deposit is still visible ; the parts higher up on the edifice have been buried by more recent lava domes and lava flows . The distal segment is also slightly raised compared to the more proximal parts . The collapse deposit covers a surface area of and has a hummocky appearance , similar to the collapse deposit formed by the 1980 eruption of Mount St. Helens . The avalanche deposit separates the Salar de San Martin from the Salar de Ollague
1980 eruption of Mount St. Helens
1980 eruption of Mount St. Helens
Ollagüe