USGS Monitoring Four US Volcanoes Showing Signs of Activity and Unrest

The USGS continues to keep a close eye on volcanoes around the US, with four now at elevated Orange / Watch due to the activity noticed at the four of them. The Great Sitkin, Pavlof, Semisopochnoi, and Kilauea are the four volcanoes showing signs of unrest. Except for Hawaii's Mauna Loa, which remains Yellow / Advisory, all other volcanoes the USGS is keeping a close eye on are Green or unrated.