There are certain to be numerous detailed reports prepared on the effects of this earthquake in the future. This article is intended to provide a brief preliminary summary of the apparent behavior of prestressed and precast concrete under the seismic loads of this earthquake. The major damage appears to be centered between the Sylmer area and the Van Norman Dam reservoir. Newspaper coverage was quite extensive on the failures at the San Fernando Veterans Administration Hospital and the Olive View Tuberculosis Sanitarium in Sylmer, California. The Veterans Administration Hospital buildings which collapsed were built in the 1920's and were of cast-in-place reinforced concrete construction. The Tuberculosis Sanitarium was recently completed and was a cast-in-place moment-resisting structure. Non-load-bearing precast concrete curtain wall panels were used on the exterior of the Sanitarium building. The Van Norman Lake Dam, an earth-filled structure, suffered such severe damage that housing areas below the dam were evacuated. Between these two areas, extensive damage occurred to homes and highway structures. At some of the collapsed bridges there was evidence of severe vertical displacement of the ground up to 3 feet and horizontal ground displacement of up to 6 feet. Also, preliminary reports from California indicated that superimposed loads on structures may have reached approximately 25 percent of gravity. In the Los Angeles area recording instruments are required in new structures and more precise data on the actual earthquake loads will be available later. These may substantiate or correct the above load intensity information. The the Los Angeles city area, more than 20 miles from the epi-center, precast concrete behaved in an excellent manner in both tall buildings and smaller structures.