Volcano Alert Levels

Volcano Alert Levels

Detailed Description

The USGS Alert-Notification System for Volcanic Activity includes Volcano Alert Levels, which rank a volcano’s status for people on the ground, and Aviation Color Codes, which rank airborne ash hazards for the aviation sector. This four-tiered system ranges from Normal/Green to Warning/Red to indicate increasing level of concern.

Details

Image Dimensions: 900 x 564

Location Taken: US