Ash Fall 2 : Fine (less than 4 mm in diameter) unconsolidated volcanic debris blown into the atmosphere during an eruption; can remain airborne for long periods of time and travel considerable distance from the source
The International Disaster Database (EM-DAT), The EM-DAT Glossary, Centre for Research on the Epidemiology of Disasters (CRED), School of Public Health, Universit catholique de Louvain, Brussels, Belgium 2009. http://www.emdat.be/glossary/9, (ND/ Gen - Brit) {855}