Presentations (1-2 of 2)

1. Size of volcanic ash

   08 Feb 2011 | Contributor(s):: William I Rose

   Size of ash particles is discussed--ash, lapilli, fine and very fine ash, phi sizes, lognormal distributions and bimodal ones. Patterns of fallout and grain size distributions.

2. Origin of volcanic ash: Mechanisms for formation

   08 Feb 2011 | Contributor(s):: William I Rose

   Mechanisms for the formation of volcanic ash are reviewed and discussed, including explosive vesiculation, phreatomagmatic explosions and milling/comminution.