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If conditions are right, the fused sand forms long hollow tubes called fulgurite. The term comes from the Latin word fulgur, which means lightning. Although lightning strikes earth at least a million times each day, only rarely does fulgurites form. Fulgurites are usually found beneath the surface of the sand, generally decreasing in diameter and sometimes branching outs as they descend.
In the 1811-12 earthquakes the sand blows were enormous and covered large regions of the Missouri bootheel. Liquefaction can cause other problems as the soil loses it ability to resist shear and flows much like quick sand. Anything relying on the substrata for support can shift, tilt, rupture, or collapse.