Hi Ken -- they're listed with our reports: https://www.avo.alaska.edu/activity/avoreport.php You can also find them on the VHP site, including a legend for the icons used on maps: http://volcanoes.usgs.gov/activity/alertsystem/index.php Thanks, -Seth -------- Ken Koch wrote: Hello, I cannot find anywhere on your site that the alert levels and aviation color codes are defined. Could you tell me where these definitions are located, or send them to me? Thanks. -- Seth Snedigar Alaska Volcano Observatory Alaska Division of Geological and Geophysical Surveys seth.snedigar@alaska.gov 907-451-5033 http://www.avo.alaska.edu/