There are 161 potentially active volcanoes in the United States. USGS Volcano Observatories release regular notifications to communicate increases or decreases in volcanic activity and to explain any unusual or hazardous circumstances.
Volcano Observatory staff monitor, research, and issue formal notices of activity for volcanoes in assigned geographic areas. Scientists also assess volcano hazards and work with communities to prepare for volcanic eruptions.
California Volcano Observatory News
Cascades Volcano Observatory News
Yellowstone Volcano Observatory News
Clear Lake Volcanic Field News
Mammoth Mountain News
Mauna Loa News
Mauna Kea News
Mount Shasta News
Volcanoes (Current Alerts for U.S.)
Hawaii Volcano Observatory (HVO) News
Volcano Hazards Program: Last 7 days—Volcano Updates (includes Mariana Islands)