The art (and science) of assigning Volcano Alerts Levels

2200479_web1_USGS-Volcano-Alerts-Aviation-Colors_copy.jpg
The U.S. Geological Survey Hawaiian Volcano Observatory changed the Volcano Alert Level and Aviation Color Code for Mauna Loa Volcano from normal/green to advisory/yellow on Thursday. This change reflects HVO’s determination that the volcano is showing persistent signs of low-level