A pyroclastic flow sweeps down the north flank of Augustine volcano in Alaska on March 30, 1986, 3 days after the start of a 5-month long eruption. A large convecting ash column rises above the moving pyroclastic flows. As with many Augustine eruptions, early pyroclastic flows were pumice rich; later in the eruption block-and-ash flows were produced by collapse of a growing lava dome.
Type/Process: Pyroclastic Flow
Volcanic Status: Historical
Image Number: 052-079
Photographer: Betsy Yount (U.S. Geological Survey)
Summit Elevation: 1252 meters
Latitude/Longitude: 59.363 N / 153.43 W
Timeframe: Last known eruption 1964 or later