Liquefaction also caused about 15 cm of settlement and extensive pavement cracking in the parking lot at the plant. At both the filtration plant and the nearby San Fernando Juvenile Hall, ground failures produced by the Northridge Earthquake were significantly less severe than those from the 1971 San Fernando Earthquake, but they occurred at the same locations. In the yacht club at King Harbor in Redondo Beach, liquefaction of sand fill resulted in settlement distortions of two buildings and large lateral spreading movements that severely damaged a concrete retaining wall and several mooring pylons. At the swimming lagoon, a long diving platform and a concession building also settled differentially. The King Harbor area, which was developed during the early 1960s, reportedly did not have liquefaction effects during the 1971 San Fernando Earthquake.
Sand boils at a city swimming lagoon in King Harbor.
Landslides and Slope Movements Landslides and rockfalls triggered by the earthquake were common on steep slopes surrounding the epicentral region. Numerous slope failures occurred along steep slopes and shattered ridge crests in the Santa Susana Mountains, particularly along their northern flank. In the Granada Hills area, a portion of an apartment building in a hillside condominium development collapsed because of foundation movements in an area that appeared to have had downslope movement prior to the earthquake. References for Map Information Hill, M. L. 1954. Tectonics of Faulting in Southern California.