Volcanoes
Smithsonian GVP + NWS · Updated Daily · Source: Smithsonian GVP + NWS
About Volcanoes
The United States has over 160 potentially active volcanoes, concentrated in Alaska, Hawaii, the Cascade Range (Washington, Oregon, California), and Yellowstone. Volcanic hazards include lava flows, pyroclastic flows, ashfall, lahars (volcanic mudflows), and volcanic gases. Even distant eruptions can affect air travel across the continent through ash clouds at flight altitudes.
Data Source
Volcano locations and metadata come from the Smithsonian Institution's Global Volcanism Program database, the authoritative scientific record of Earth's volcanoes and their eruptive histories. Current alert levels and eruption bulletins are maintained by the USGS Volcano Hazards Program (VHP) through its network of volcano observatories (USGS-AVO, HVO, CVO, YVO, etc.). NWS volcanic ashfall alerts are retrieved from api.weather.gov.
| Detail | Value |
|---|---|
| Provider | Smithsonian Institution Global Volcanism Program and NOAA National Weather Service |
| Update Frequency | Daily |
| Coverage | United States (all 50 states and territories) |
| API / Data Feed | volcano.si.edu/database/ and api.weather.gov |
What the Map Shows
All Holocene-age (last 11,700 years) US volcanoes from the Smithsonian GVP database, color-coded by current USGS Volcano Alert Level (Normal, Advisory, Watch, Warning). Active NWS volcanic ashfall advisories and warnings are overlaid. Clicking a volcano marker shows its elevation, last known eruption, and current monitoring status.
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