Earthquake vibrations can turn soil into a liquid. This process is called liquefaction. This 1.5 minute video provides visual demonstrations of how liquefaction occurs using the large shaker at NEES@Texas to vibrate the ground.
Researchers should cite this work as follows:
Kenneth Stokoe; NEES EOT (2013), "Quake Turns Ground to Liquid (Hacking the Planet episode)," http://nees.org/resources/7381.