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1971 san fernando earthquake damage

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The unincorporated districts of Newhall, Saugus, and Solemint Junction had moderate damage, even to newer buildings. There was no movement on the faults near the hospital; damage to the building has been attributed to the intense shaking to which it was subjected. 100% satisfaction guaranteed. Damage from the San Fernando, 1971, earthquake. Nursing homes also were affected. The two facilities, located near Grapevine and Weldon canyons that channel water and debris off the Sierra Madre Mountains, are lined by steep ridges and have formed alluvial fans at their mouths. The largest cumulative amount of slip of 6 feet 7 inches (2.01 m) occurred along the Sylmar and Tujunga segments. Although the complete Sierra Madre Fault Zone had previously been mapped and classified by name into its constituent faults, the clusters of fault breaks provided a natural way to identify and refer to each section. The landslides they mapped included those in the eastern half of the San Fernando quadrangle. In the vicinity of the Sylmar Fault segment, there was a low possibility of landslides due to a lack of elevation change, but in the foothills and mountainous area a large amount of landsliding occurred and more work was necessary to eliminate the possibility of misidentifying a feature. Intact blocks of embankment material moved tens of feet on liquefied hydraulic fill shell material (figures D-8-1 and D-8-2). Earthquake Damage Photos . [26][27], Introduced as Senate Bill 520 and signed into law in December 1972, this legislation was originally known as the Alquist-Priolo Geologic Hazard Zones Act, and had the goal of reducing damage and losses due to surface fault ruptures or fault creep. New legislation included the Alquist-Priolo Special Studies Zone Act and the development of the Strong Motion Instrumentation Program. The damage at the lower dam consisted of a landslide that dislocated a section of the embankment. Olive View Hospital, a county-owned structure, is such a lesson. A little known fact was that the Van Norman … This made the earthquake the most documented event, at the time, in terms of strong-motion seismology; by comparison, the 1964 Alaska earthquake did not provide any strong motion records. In addition to the collapse of the stairways, the elevators were out of commission. The area where the heaviest effects were present was limited by geographical features on the three remaining margins, with the Santa Susana Mountains on the west, the [8], Paleomagnetic evidence has shown that the western Transverse Ranges were formed as the Pacific Plate moved northward relative to the North American Plate. Ground displacement damaged sidewalks and roads, with cracks in the more rigid asphalt and concrete often exceeding the width of the shift in the underlying soil. Peter Fischer, of Whittier College, had the foresight and was instrumental in making arrangements for Marine Corps support. It was California's third worst earthquake in terms of lives lost (exceeded by San Francisco, 1906 and Long Beach, 1933) and second in terms of property damage (exceeded by San Francisco, 1906). As a result, building of new structures for human occupancy across active fault lines was banned. Abundant cracks formed in the ground at the site, and some foundations and many sidewalks were also cracked. The California Strong Motion Instrumentation Program was initiated in 1971 with the goal of maximizing the volume of data by furnishing and maintaining instruments at selected lifeline structures, buildings, and ground response stations. Only three lives were lost: two were patients who died when forcibly cut off from their positive pressure breathing equipment, and one staff member was killed by falling debris outside the building. [16], The areas that were affected by the strongest shaking were the outlying communities north of Los Angeles that are bounded by the northern edge of the San Fernando Valley at the base of the San Gabriel Mountains. The difference in rigidity at the second floor was proposed as a cause of the considerable damage to the lower levels. [25], Following many of California's major earthquakes, lawmakers have acted quickly to develop legislation related to seismic safety. Since both occurred in urban and industrial areas and resulted in significant economic impairment, each event drew critical observation from planning authorities, and has been thoroughly studied in the scientific communities. [12][13], All segments shared the common elements of thrust faulting with a component of left-lateral slip, a general east–west strike and a northward dip, but they were not unified with regard to their connection to the associated underlying bedrock. On February 9, 1971, a magnitude 6.6 earthquake in California’s San Fernando Valley claimed 65 lives. An hour before sunrise, at 6:01 AM, PST, on February 9, 1971, the San Fernando region was struck by one of the most devastating earthquakes in California history. This was done as a precaution to accommodate further collapse due to a strong aftershock. On February 9th, 1971, at approximately 6:00am, the foothills of the San Gabriel Mountains were struck by a 6.7 earthquake. Two were due to power failure of life-support systems and one, that of an employee who was struck by part of the collapsing building as he or she tried to exit the building, was a direct result of the destruction. Since the collapse of the dam lowered its overall height, the decision to reduce its capacity proved to be a valuable bit of insurance. One of the hardest-hit buildings was the just-completed San Fernando Veterans Administration Hospital, whose unreinforced concrete wings collapsed, killing at … the 1971 san fernando earthquake An hour before sunrise, at 6:01 AM, PST, on February 9, 1971, the San Fernando region was struck by one of the most devastating earthquakes in California history. Some canals in the area of the dams were damaged and not usable, and dikes experienced slumping but these did not present a hazard. The unincorporated districts of Newhall, Saugus, and Solemint Junction had moderate damage, even to newer buildings. 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. There was evidence to suggest the slope failure took place after the shaking had stopped. The narrow band of ground disturbances were found to have been the result of settling of the soft soil in a downhill motion. Moving eastward, there is the Ventura Basin, the San Fernando Valley, and the San Gabriel Basin, with active reverse faults (San Cayetano, Red Mountain, Santa Susana, and Sierra Madre) all lining the north boundary. On Interstate 5, the most significant damage was between the Newhall Pass interchange on the north end and the I-5 / I-405 interchange in the south, where subsidence at the bridge approaches and cracking and buckling of the roadway made it unusable. The success in this area spurred the initiation of California's Strong Motion Instrumentation Program. Cracks formed in the rocks and a rock slide came within 15 feet (4.6 m) of the apparatus, and the foundation remained undamaged, but a small (half-degree) tilt of the unit was discovered that was apparently responsible for closing the horizontal pendulum contacts. The hospital was staffed by 98 employees and had 606 patients at the time of the earthquake; all three deaths that occurred at the Olive View complex were in this building. As the plate shifted to the north, a portion of the terrane that was once parallel with the coast was rotated in a clockwise manner, which left it positioned in its east–west orientation. Find art you love and shop high-quality art prints, photographs, framed artworks and posters at Art.com. 1971 San Fernando (California) Earthquake Archive. [15], In early 1971, the San Fernando Valley was the scene of a dense network of strong-motion seismometers, which provided a total of 241 seismograms. Additional breaks occurred farther to the east that were in a more scattered fashion, while the western portion of the most affected area had less pronounced scarps, especially the detached Mission Wells segment. The lower dam was very close to breaching, and approximately 80,000 people were evacuated for four days while the water level in the reservoir was lowered. Sylmar, Los Angeles 1971 San Fernando earthquake Antelope Valley Emergency! The unanticipated thrust earthquake had a magnitude of 6.5 on the M s scale, and a maximum Mercalli intensity of XI (Extreme).The event was one in a series that affected the Los Angeles area in the late … On the day following the earthquake, State Geologist Wesley Bruer convened a meeting of more than 40 geologists and seismologists engaged in studying the earthquake, so that all investigative activities might be coordinated. 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