Tokyo, one of the world’s most densely populated megacities, sits on a highly active seismic zone where the threat of major earthquakes is ever-present. One of the most destructive aspects of seismic events in Tokyo is a geological phenomenon known as soil liquefaction. This occurs when the intense shaking from an earthquake causes saturated, loosely packed soil to temporarily lose its strength and stiffness, essentially causing the ground to behave like a liquid.