Content Previous Next

EARTHQUAKE DAMAGE, NORTHERN IRAN, JUNE 21, 1990

Building Damaged by Ground Failure, Iran

[BUILDING DAMAGE, LIQUEFACTION] Wall crack caused when soils liquefied and building settled during the earthquake. Soils liquefy when ground water near the surface is forced between the grains of sand during an earthquake. The sandy soil behaves like a very thick liquid. Structures then settle or tip in the liquefied soil or are ripped apart as the ground spreads laterally or flows. Photograph Credit: M. Mehrain, Dames and Moore.