Liquefaction occurs when waterlogged, loosely packed sediments at or near the ground's surface start to lose strength as a result of violent ground shaking. During earthquakes, liquefaction beneath buildings and other structures can result in significant damage. For instance, the 1964 Niigata earthquake in Japan triggered widespread liquefaction, which led to the destruction of numerous structures. Additionally, the liquefaction of the sediments and debris used to create a lagoon during the Loma Prieta, California earthquake in 1989 resulted in significant subsidence, fracture, and horizontal sliding of the ground surface in the Marina neighborhood of San Francisco.

The following types of sediment are particularly prone to liquefaction: artificial fill, beach sand, dunes, river deposits, and relatively young sediment. Learn more about the potential for liquefaction of the material that lies beneath your house. For maps with potential for liquefaction, consult the Geologic Information Portal: https://buff.ly/3NBLryu

https://buff.ly/3NDYuzx

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