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[quote user="blue streak 1"]That vibration by earthquakes is exactly what happens to cause the liquefaction damages that are so destructive on fill and settlement soils.[/quote] Earthquakes are one probable cause for soil liquefaction. Other vibrations, like heavy trains, can have the same effect. <a href="https://www.youtube.com/watch?v=Rd6W2aP2dkA">https://www.youtube.com/watch?v=Rd6W2aP2dkA</a> Wiki explanation "Soil liquefaction": Soil liquefaction occurs when a saturated or partially saturated <a title="Soil" href="https://en.wikipedia.org/wiki/Soil">soil</a> substantially loses <a title="Shear strength (soil)" href="https://en.wikipedia.org/wiki/Shear_strength_(soil)">strength</a> and <a title="Stiffness" href="https://en.wikipedia.org/wiki/Stiffness">stiffness</a> in response to an applied <a title="Shear stress" href="https://en.wikipedia.org/wiki/Shear_stress">stress</a> such as shaking during an <a title="Earthquake" href="https://en.wikipedia.org/wiki/Earthquake">earthquake</a> or other sudden change in stress condition, in which material that is ordinarily a solid behaves like a liquid. Regards, Volker
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