Volcanic activity is one of the main agents responsible for shaping the landscape, environment and climate of planets and moons. On Earth, volcanic eruption can also have catastrophic consequences for human society.
This work provides a detailed picture of the rockslide-debris avalanches of the May 18, 1980, eruption of Mount St. Helens Volcano. The work provides a characterization of the deposit, a reinterpretation of the details of the first minutes of the eruption of May 18, and insight into the transport mechanism of the mass movement.