Scotland's Volcanoes: 793 Dormant, 3 Active — But All Extinct in Practice
Scotland has 793 dormant and 3 "active" volcanoes — but none have erupted in 300+ million years. The "active" classification is geological (not currently erupting but not eroded to roots), not operational.
The Numbers
- Dormant: 793 (identified volcanic necks, plugs, dikes, flows)
- Active (geological definition): 3 — Arthur's Seat (Edinburgh), Castle Rock (Edinburgh), Bass Rock (Firth of Forth)
- Last eruption: Carboniferous Period (~340 Ma) — before dinosaurs
Why "Active" If No Eruptions?
- Geological "active" = not completely eroded / still has volcanic form
- Arthur's Seat: 350 Ma volcano, glacial sculpting — shape intact
- Castle Rock: Volcanic plug — Edinburgh Castle sits on it
- Bass Rock: Phonolite plug — gannet colony, sheer cliffs
Major Volcanic Provinces (Extinct)
| Region | Age | Features |
|---|
| Midland Valley | Carboniferous (340 Ma) | Arthur's Seat, Castle Rock, Bathgate Hills, Clyde plateau lavas |
| Hebridean Igneous Province | Paleogene (60 Ma) | Skye (Cuillin), Rum, Mull, Ardnamurchan — central complexes, dikes |
| North Atlantic Igneous Province | Paleogene | Giant's Causeway (NI), Staffa (Fingal's Cave) — columnar basalt |
| Orkney / Shetland | Devonian (380 Ma) | Old Red Sandstone volcanics |
Real Volcanic Risk for Scotland
- Iceland: 1,000 km NW — ash disruption (2010 Eyjafjallajökull closed UK airspace)
- Jan Mayen (Norway): 800 km N — Beerenberg volcano
- Azores: 2,500 km SW — mid-Atlantic ridge
Scotland's volcanoes are geological monuments, not hazards. The risk comes from elsewhere. Visit Arthur's Seat for the view — not the eruption.
Wanderlust World