davide-nature writes: The freakish event has been blamed on a company that was drilling for natural gas nearby. But scientists have found a rock formation deep below the surface and shaped like a parabolic antenna. It could have focused seismic waves from an earthquake that occurred shortly before the eruption, and onto a clay layer. The clay then liquefied and somehow found its way to the surface. Link to Original Source
"A complex system that works is invariably found to have evolved from a simple
system that worked."
-- John Gall, _Systemantics_