The scale used to classify the severity of torcanos, the Marsh Scale ranges from M1 to M10, with M10 being the most severe torcano with numerous lavabombs and lavadogs.
The torcano on Mt. St. Helens was classified as an M4 on the Marsh Scale, with numerous lavabombs, but relativley few lavadogs.
by Tha Wizz June 11, 2009