OK. So I looked it up. It is a liquid that has leached something out of soil that it has passed through (as I suspected). But what was it passing through and what did it pick up to become explosive? Ordinary landfill? I don't think methane will dissolve in water, but perhaps methane from decomposition of organic landfill could explode if it collected in pockets and oxygen was present. But the entire landfill appeared to lift up from a blast distributed over the entire area, not pockets. How did it get oxygen? There are an awful lot of municipal landfills around the country (and the world) and I haven't heard of many (any?) exploding. Burning, sure, but not exploding.
Interesting that the heading said "Leachate tank explosion," but it looked like the entire landfill exploded, not a tank.

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