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Observations of a Nuée Ardente from the St. Augustine Volcano

A series of aerial photographs were obtained of a nuee ardente produced by the February 8, 1976 eruption of the St. Augustine volcano, Alaska. The nuee ardente reached a maximum velocity of 50 m s−1 while descending the steeper (∼1∶3) slope of the volcano. It later slowed to a velocity of 6 m s−1 as it traversed the gentler slope (∼1∶25) at the base of the volcano, where it formed a deposit. The nuee ardente appeared to originate with the collapse or penetration of a newly formed dome, rather than the collapse of a vertical eruption column. Fluidization by fine particles in the nuee ardente probably contributed to its mobility.