Alert levels and aviation color code icons for volcanoes within the...
Detailed Description
Alert levels and aviation color code icons for volcanoes within the USGS area of responsibility.
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
