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Earthquake hazards associated with the Verdugo-Eagle Rock and Benedict Canyon fault zones, Los Angeles County, California

1980; United States Department of the Interior; Linguagem: Inglês

10.3133/ofr81296

2332-4899

F. Harold Weber, Jason Bennett, R H Chapman, Gerald W. Chase, R.B. Saul,

Landslides and related hazards

fault zones compose a system of faults about 32 km in length that extends southeasterly from the south edge of the Pacoima Hills at the north edge of the San Fernando Valley to Pasadena where the San Rafael fault apparently terminates against the Raymond fault zone.Faults of the system generally separate pre-Late Cretaceous igneous and metamorphic rocks of the Verdugo Mountains and San Rafael Hills on the northeast from Cenozoic sedimentary rocks and sediments of the San Fernando Valley and other lowlands on the southwest.At the northwest end of the system, the Verdugo fault probably bends westward and joins the Mission Hills fault zone, although it may be truncated by an east-trending fault (not recognized at the ground surface) which lies between the Mission Hills and Northridge Hills faults.Faults of the Verdugo -Eagle Rock -San Rafael system dip gently to steeply northward, but only along the west part of the Eagle Rock fault are dips well-defined (15~30° north).The most active segment of the system may be the Verdugo fault between Verdugo Wash on the southeast A-l Hollywood -Glassell Park -Highland Park areas.Features of surface faulting In these areas are wel1-developed; and the areas are especially populous and contain many high-rise buildings, schools, hospitals and older, especially earthquake-prone buildings.New buildings will continue to be constructed as older areas are redeveloped.Additional targets of such analysis of surface features of faulting could be the Northridge Hills and other known and possible faults of the San Fernando Valley.