![]() ![]() When soil liquefies, as with quicksand, it loses strength and behaves like a viscous liquid rather than a solid, according to the Utah Geological Survey. To understand quicksand, you have to understand the process of liquefaction. The vibration plus the water barrier reduces the friction between the sand grains and causes the sand to behave like a fluid. Larry Barron of the New South Wales Geological Survey. ![]() Vibration tends to enhance the quickness, so what is reasonably solid initially may become soft and then quick, according to Dr. The liquefied surface loses strength, causing buildings or other objects on that surface to sink or fall over. Earthquakes: The force of the shaking ground can increase the pressure of shallow groundwater, which liquefies sand and silt deposits.Flowing underground water: The force of the upward water flow opposes the force of gravity, causing the granules of sand to be more buoyant.
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