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USGS Volcano Notification Service informs island residents about Hawaiian volcan

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. To learn more, please visit https://volcanoes.usgs.gov/vhp/about_alerts.html.

Sources/Usage

Public Domain.