After it was brought to my attention that Mt. St. Helens was falsely showing on my volcano display, even though it wasn't active for a couple of months, I had to change the data source, away from the Smithsonian Institution.
My data now are from the International Volcano Research Centre, at Apache Junction, Arizona. I thank R. B. Trombley,Ph.D. and his associates for permission to use the data.
Scale of volcanic acitivities:
(Volcano Alert Level 1)
(Volcano Alert Level 2-4)
Data from: http://www.intlvrc.org/alerts.htm
Update interval: twice daily.