The 1971 San Fernando earthquake occurred in the early morning of February 9 in the foothills of the San Gabriel Mountains in southern California. The unanticipated thrust earthquake had a magnitude of 6.5 on the Ms scale and 6.6 on the Mw scale, and a maximum Mercalli intensity of XI (Extreme). The event was one in a series that affected Los Angeles county in the late 20th century. Damage was locally severe in the northern San Fernando Valley and surface faulting was extensive to the south of the epicenter in the mountains, as well as urban settings along city streets and neighborhoods. Uplift and other effects affected private homes and businesses.

The San Fernando Valley, known locally as the Valley, is an urbanized valley in Los Angeles County, California. Situated to the north of the Los Angeles Basin, it contains a large portion of the city of Los Angeles, as well as several unincorporated areas; and the incorporated cities of Burbank, Calabasas, Glendale, Hidden Hills, and San Fernando. The valley is well known for its film studios such as Warner Bros. Studios and Walt Disney Studios. In addition, it is home to the Universal Studios Hollywood theme park.