Character, mass, distribution, and origin of tephra-fall deposits from the 2009 eruption of Redoubt Volcano, Alaska-Highlighting the significance of particle aggregation

► Magmatic explosions, dome-building, and collapse are common at this volcano. ► Ash plumes and fallout are one of the primary hazards from this volcano. ► Redoubt is a natural laboratory for the study of particle aggregation and sedimentation. ► Economic losses due to disruptions to airline travel by volcanic ash were significant.