Question

In San Francisco's Marina district in 1989, some fill underwent permanent deformation and settling, and some formed slurries as underground water and loose sediment flowed like a fluid in a process known as __________.

Answer 1

Liquefaction

Step-by-step explanation:

Liquefaction occurs when the soil particles are made to lose contact with one another due to vibration or water pressure on the soil.

When this happens the soil behaved like a liquid and loses its ability to support and hence can flow like water.

In 1989, in San Francisco's Marina, there was a liquefaction occurrence.

Answer 2

liquefaction

Step-by-step explanation:

According to historical reports in Oct. 17, 1989 the San Francisco's Marina district was hit hard by the Loma Prieta earthquake where liquefaction occurred after the earthquake.

The liquefaction process occurs when the strength and stiffness of a soil is reduced by earthquake shaking or other rapid loading.