[OneVike]

When was that, because one of the theories is that it was a phenomenon called a "Sand blow". or "Sand Volcano".

This is something that occurs (usually after an earthquake) when an Intense seismic shaking causes the sediments that are loose to change from a solid to liquid (not literally), due to the the pressure of the seismic shaking. This opens up gaps between the clay. A fracture occurs through the loose sediment that causes an upward flow of sand to fly out of the ground that looks like a geyser.

However, there were no earthquakes nor tremors anywhere near the region before this occurred.

[Roccus]

New Madrid quakes were 1811 - 1812.