This is probably the fastest lava in the world – http://www.youtube.com/watch?v=qputaVyn7TE
it’s from a volcano I’ve written about here /speedj13-zone/2013/06/25/what-volcano-is-the-most-abnormal-one-on-earth-why-is-it-abnormal/
The reason it is so fast is because it has a very low viscosity – meaning it flows easily. Think of it like cooking oil, whereas most volcanoes are more like treacle or marmite!
You can out-run most lavas, but what goes really fast is pyroclastic flows – they can go at up to 600 km per hour….! check this one out:
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