minimizing volcanic hazard (volcanic alert or warning)

 
 

 
 
 
 
 

VOLCANIC ALERT OR WARNING

At what point should the public be alerted or warned that a volcanic eruption may occur?

The USGS Volcano Hazard Program has adopted an alert notification system nationwide for characterizing the level of unrest and eruptive activity at volcanoes.

The standardized USGS alert-notification system for volcanic activity was designed to be useful to people on the ground and to those in aviation. 

To meet these goals, the alert-notification system has two parts -

•  a four-tiered Volcano Alert Level 
•  a four-tiered Aviation Color Code

                                                      Ground based volcano alert level