Very High Threat is the USGS classification for the eighteen most dangerous volcanoes in the United States. This channel is about them -- and about the faults, subduction zones and tsunami sources that share the same problem: a mapped hazard, a published report, and a town at the bottom of it.

Each documentary takes one American threat and builds the whole picture: the geology, the rupture record, the official hazard assessment, and what actually happens to the people living on top of it.

No doomsday predictions. No conspiracy theories. Just published research and the arithmetic of overdue.

New long-form documentary every week. Every source cited in the description below each video.