Supervolcanoes
Six calderas that have each produced at least one supereruption (VEI 7 or larger). Status comes from the official observatories where they publish an open feed. "Normal" is the usual state and nearly every volcano is normal nearly all the time.
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- Unrest is not an eruption. Earthquake swarms, ground uplift and gas release happen at many calderas for years or decades without erupting. Campi Flegrei has been at a yellow alert level since 2012.
- A long gap is not a countdown. Yellowstone's three big eruptions came roughly 2.1 million, 1.3 million and 0.63 million years ago, but the intervals vary and the system does not run on a clock. The USGS Yellowstone Volcano Observatory says as much on its site.
- Counts of people are lower bounds. They include only cities of 15,000 or more within 100 km. Yellowstone shows none because the nearest such cities are further away, though millions of visitors pass through each year.
- Toba and Aira (Sakurajima) have no live feed on this site. Monitoring exists (Sakurajima is watched by the Japan Meteorological Agency); it is just not ingested here.
What a supereruption could do: Supervolcano scenario → · Show on the map →