Contents 1 Tectonic setting 2 Earthquake 2.1 Surface faulting 2.2 Aftershocks 2.3 Landslides 2.4 Strong motion 3 Damage 3.1 Olive View Hospital 3.2 Veterans Administration Hospital 3.3 Van Norman Dam 3.4 Transportation 3.5 Schools 4 Aftermath 5 See also 6 References 7 External links

Tectonic setting[edit] See also: Thrust tectonics The San Gabriel Mountains are a 37.3 mi (60.0 km) long portion of the Transverse Ranges and are bordered on the north by the San Andreas Fault, on the south by the Cucamonga Fault, and on the southwest side by the Sierra Madre Fault. The San Bernardino, Santa Ynez, and Santa Monica Mountains are also part of the anomalous east–west trending Transverse Ranges. The domain of the ranges stretches from the Channel Islands offshore, to the Little San Bernardino Mountains, 300 miles (480 km) to the east. The frontal fault system at the base of the San Gabriel Mountains extends from the San Jacinto Fault Zone in the east to offshore Malibu in the west, and is defined primarily by moderate to shallow north-dipping faults, with a conservative vertical displacement estimated at 4,000–5,000 feet (1,200–1,500 m).[9] Paleomagnetic evidence has shown that the western Transverse Ranges were formed as the Pacific Plate moved northward relative to the North American Plate. 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. The Transverse Ranges form the perimeter of a series of basins that begins with the Santa Barbara Channel on the west end. 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. A small number of damaging events have occurred, with three in Santa Barbara (1812, 1925, and 1978) and two in the San Fernando Valley (1971 and 1994), though other faults in the basin that have high Quaternary slip rates have not produced any large earthquakes.[10]

Earthquake[edit] CISN ShakeMap of the San Fernando earthquake mainshock See also: California earthquake forecast The San Fernando earthquake occurred on February 9 at 6:00:41 am Pacific Standard Time (14:00:41 UTC) with a strong ground motion duration of about 12 seconds. The origin of faulting was located five miles north of the San Fernando Valley. Considerable damage was seen in localized portions of the valley and also in the foothills of the San Gabriel Mountains above the fault block. The fault that was responsible for the movement was not one that had been considered a threat, and this highlighted the urgency to identify other similar faults in the Los Angeles metropolitan area. The shaking surpassed building code requirements and exceeded what engineers had prepared for, and although most dwellings in the valley had been built in the prior two decades, even modern earthquake-resistant structures sustained serious damage.[11] Several key attributes of the event were shared with the 1994 Northridge earthquake, considering both were brought about by thrust faults in the mountains north of Los Angeles, and each resulting earthquake being similar in magnitude, though no surface rupture occurred in 1994. 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] Surface faulting[edit] For more details on this topic, see Fault (geology). Prominent surface faulting trending N72°W was observed along the San Fernando Fault Zone from a point south of Sylmar, stretching nearly continuously for 6 miles (9.7 km) east to the Little Tujunga Canyon. 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. 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. As categorized during the intensive studies immediately following the earthquake, they were labeled the Mission Wells segment, Sylmar segment, Tujunga segment, Foothills area, and the Veterans fault.[13][14] Ground level and overhead view of the scarp at the Foothill Nursing Home 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. The initial surveyors of the extensive faulting in the valley, foothills, and mountains reported only tectonic faulting, while excluding fissures and other features that arose from the effects of compaction and landsliding. 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. Along the hill fronts of the Tujunga segment some ambiguous formations were present because some scarps may have had influence from downhill motion, but for the most part they were tectonic in nature.[13] In repeated measurements of the different fault breaks, the results remained consistent, leading to the belief that most of the slip had occurred during the mainshock. While lateral, transverse, and vertical motions were all observed, the largest individual component of movement was 5 ft 3 in (1.60 m) of left lateral slip near the middle of the Sylmar segment. The largest cumulative amount of slip of 6 feet 7 inches (2.01 m) occurred along the Sylmar and Tujunga segments. The overall fault displacement was summarized by geologist Barclay Kamb and others as "nearly equal amounts of north–south compression, vertical uplift (north side up), and left lateral slip and hence may be described as a thrusting of a northern block to the southwest over a southern block, along a fault surface dipping about 45° north."[15] Aftershocks[edit] A three-week inspection of the aftershock activity was undertaken that included events that were recorded by an array of permanent stations that were operated by the California Institute of Technology, a USGS instrument stationed at Point Mugu, and California Department of Water Resources seismometers at Pyramid Springs and Cedar Springs. Temporary seismometers that were set up in response to the mainshock were up and running from as soon as several hours to several days after the main event and provided additional data until March 1. The catalog of items was mostly complete and included 200 shocks of magnitude 3.0 or greater and four shocks of magnitude 5.0 or greater. During the first hour of activity, the larger aftershocks were overshadowing the smaller events.[4] Main shock Mercalli intensities MMI Locations XI (Extreme) Sylmar X (Extreme) San Fernando IX (Violent) Kagel Canyon VIII (Severe) Granada Hills, Newhall VII (Very strong) Los Angeles, Northridge VI (Strong) Malibu, Ontario V (Moderate) Santa Barbara, San Diego, Barstow IV (Light) Las Vegas, Parkfield, Bishop III (Weak) Merced, Moss Landing, Palo Verde U.S. Earthquake Intensity Database, NGDC The overall pattern of aftershock activity appeared in the shape of a symmetrical inverted "U" but with slightly more concentrated activity on the southwest flank. Several of the smaller shocks approached the area of surface faulting, but for the most part, the area that experienced the heaviest shaking and damage (as a result of the mainshock) lacked aftershock activity. The Pacoima Dam, with its unusually high peak ground acceleration reading, laid very close to the center of that aftershock-free zone.[4] Landslides[edit] See also: Landslide classification The USGS commissioned a private company and the United States Air Force to take aerial photographs over 97 sq mi (250 km2) of the mountainous areas north of the San Fernando Valley. Analysis revealed that the earthquake triggered over 1,000 landslides. Highly shattered rock was also documented along the ridge tops, and rockfalls (which continued for several days) were the result of both the initial shock and the aftershocks. Few of the slides that were logged from the air were also observed from the ground. The greatest number of slides were centered to the southwest of the mainshock epicenter and close to the areas where surface faulting took place. The slides ranged from 49–984 feet (15–300 m) in length, and could be further categorized as rock falls, soil falls, debris slides, avalanches, and slumps. The most frequently-encountered type of slide was the surficial (less than 3 feet (0.91 m) thick) debris slides and were most often encountered on terrain consisting of sedimentary rock.[16] Strong motion[edit] 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. 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. Part of the reason there were so many stations to capture the event was a 1965 ordinance that required newly constructed buildings in Beverly Hills and Los Angeles over six stories in height to be outfitted with three of the instruments. This stipulation ultimately found its way into the Uniform Building Code as an appendix several years later. One hundred seventy-five of the recordings came from these buildings, another 30 were on hydraulic structures, and the remainder were from ground-based installations near faults, including an array of the units across the San Andreas Fault.[17] The instrument that was installed at the Pacoima Dam recorded a peak horizontal acceleration of 1.25 g, a value that was twice as large as anything ever seen from an earthquake. The extraordinarily high acceleration was just one part of the picture, considering that duration and frequency of shaking also play a role in how much damage can occur. The accelerometer was mounted on a concrete platform on a granite ridge just above one of the arch dam's abutments. 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. As a result of what was considered a fortunate accident, the machine kept recording for six minutes (until it ran out of paper) and provided scientists with additional data on 30 of the initial aftershocks.[17]

Damage[edit] See also: Convento Building (Mission San Fernando) and Mission San Fernando Rey de España 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 unincorporated districts of Newhall, Saugus, and Solemint Junction had moderate damage, even to newer buildings. 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 Santa Monica Mountains and the Los Angeles River to the south, and along the Verdugo Mountains to the east. Loss of life that was directly attributable to the earthquake amounted to 58 (a number of heart attack and other health-related deaths were not included in this figure). Most deaths occurred at the Veterans and Olive View hospital complexes, and the rest were located at private residences, the highway overpass collapses, and a ceiling collapse at the Midnight Mission in downtown Los Angeles.[18] Partly detached staircase and severely damaged buildings at the Olive View Hospital The damage was greatest near and well north of the surface faulting, and at the foot of the mountains. The hospital buildings, the freeway overpasses, and the Sylmar Juvenile Hall were on coarse alluvium that overlay thousands of feet of loosely consolidated sedimentary material. In the city of San Fernando, underground water, sewer, and gas systems suffered breaks too numerous to count, and some sections were so badly damaged that they were abandoned. 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. Accentuated damage near alluvium had been documented during the investigation of the effects of the 1969 Santa Rosa earthquakes. A band of similarly intense damage further away near Ventura Boulevard at the southern end of the valley was also identified as having been related to soil type.[19] Federal, county, and private hospitals suffered varying degrees of damage, with four major facilities in the San Fernando Valley suffering structural damage, and two of those collapsing. The Indian Hills Medical Center, the Foothill Medical Building, and the Pacoima Lutheran Professional building were heavily damaged. Nursing homes also were affected. The one-story Foothill Nursing Home sat very close to a section of the fault that broke the surface and was raised up three feet higher than the street. Scarps ran along the sidewalk and across the property. The building was not in use and remained standing. Though the reinforced concrete block structure was afflicted by the shock and uplift, the relatively good performance was in stark contrast to that of the Olive View and Veterans Hospital complexes.[20] Olive View Hospital[edit] Main article: Olive View – UCLA Medical Center Most of the buildings at the Los Angeles County–owned, 880-bed hospital complex had been built before the adoption of new construction techniques that had been put in place after the 1933 Long Beach earthquake. The group of one-story structures 300 feet west of the new facility, and some other buildings, were not damaged. The damaged buildings variously were wood-frame and masonry structures. The five-story, reinforced-concrete Medical Treatment and Care Building was one of three new additions to the complex (all three of which sustained damage), was assembled with earthquake-resistant construction techniques, and was completed in December, 1970. 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. 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.[20] Fallen stair towers and damaged basement at the Olive View Hospital The Medical Treatment and Care Building included a basement that was exposed (above grade) on the east and south sides, mixed (above and below grade) on the west side, and below grade on the north side of the building, the variation being due to the shallow slope at the site. The complete structure, including the four external staircases, could be considered five separate buildings, because the stair towers were detached from the main building by about four inches. Earthquake bracing used in the building's second through fifth floors consisted of shear walls, but a rarely used slip joint technique used with the concrete walls at the first floor kept them from being part of that system. Damage to the building, including ceiling tiles, telephone equipment, and elevator doors, was excessive at the basement and the first floor, with little damage further up. The difference in rigidity at the second floor was proposed as a cause of the considerable damage to the lower levels. Because the first floor almost collapsed, the building was leaning to the north by almost two feet, and three of the four concrete stair towers fell away from the main building.[20] On the grounds, there were cracks in the pavement and soil, but no surface faulting. In addition to the collapse of the stairways, the elevators were out of commission. Electrical power and communications failed at the hospital at the time of the earthquake, but very few people occupied the lower floors and the stairways at the early hour. Casualties in these highly affected areas might have increased had the shock occurred later in the day. The duration of strong ground motion at that location was probably similar to the 12 seconds observed at the Pacoima Dam, and another few seconds' shaking is thought to have been enough to bring the building to collapse.[20] Veterans Administration Hospital[edit] Collapse of four buildings at the Veterans Hospital complex The Veterans Administration Hospital entered into service as a tuberculosis hospital in 1926 and became a general hospital in the 1960s. By 1971, the facility comprised 45 individual buildings, all lying within 5 km (3.1 mi) of the fault rupture in Sylmar, but the structural damage was found to have occurred as a result of the shaking and not from ground displacement or faulting. Twenty-six buildings that were built prior to 1933 had been constructed following the local building codes and did not require seismic-resistant designs. These buildings suffered the most damage, with four buildings totally collapsing, which resulted in a large loss of life at the facility. Most of the masonry and reinforced concrete buildings constructed after 1933 withstood the shaking and most did not collapse, but in 1972 a resolution came forth to abandon the site and the remaining structures were later demolished, the site becoming a city park.[21] Few strong motion seismometer installations were present outside of the western United States prior to the San Fernando earthquake but, upon a recommendation by the Earthquake and Wind Forces Committee, the Veterans Administration entered into an agreement with the Seismological Field Service (then associated with NOAA) to install the instruments at all VA sites in Uniform Building Code zones two and three. It had been established that these zones had a higher likelihood of experiencing strong ground acceleration, and the plan was made to furnish the selected VA hospitals with two instruments. One unit would be installed within the structure and the second would be set up as a free-field unit located a short distance away from the facility. As of 1973, a few of the highest risk (26 were completed in zone 3 alone) sites that had been completed were in Seattle, Memphis, Charleston, and Boston.[21] Van Norman Dam[edit] Damage to the Lower Van Norman Dam See also: Baldwin Hills Reservoir and Bull Creek (Los Angeles County) Both the Upper and Lower Van Norman dams were severely damaged as a result of the earthquake. 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. This was done as a precaution to accommodate further collapse due to a strong aftershock. 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 damage at the lower dam consisted of a landslide that dislocated a section of the embankment. The earthen lip of the dam fell into the reservoir and brought with it the concrete lining, while what remained of the dam was just 5 feet (1.5 m) above the water level. The upper lake subsided 3 feet (0.91 m) and was displaced about 5 feet (1.5 m) as a result of the ground movement, and the dam's concrete lining cracked and slumped.[22] The upper dam was constructed in 1921 with the hydraulic fill process, three years after the larger lower dam, which was fabricated using the same style. An inspection of the lower dam in 1964 paved the way towards an arrangement between the State of California and the Los Angeles Department of Water and Power that would maintain the reservoir's water level that was reduced 10 feet lower than was typical. Since the collapse of the dam lowered its overall height, the decision to reduce its capacity proved to be a valuable bit of insurance.[22] Differential ground motion and strong shaking (MMI VIII (Severe)) was responsible for serious damage to the Sylmar Juvenile Hall facility and the Sylmar Converter Station (both located close to the Upper Van Norman lake). The Los Angeles Department of Water and Power, as well as the County of Los Angeles, investigated and verified that local soil conditions contributed to the ground displacement and resulting destruction. The area of surface breaks on the ground at the site was 900 ft (270 m) (at its widest) and stretched 4,000 ft (1,200 m) down a 1% grade slope towards the southwest. As much as 5 ft (1.5 m) of lateral motion was observed on either end of the slide, and trenches that were excavated during the examination at the site revealed that some of the cracks were up to 15 ft (4.6 m) deep. 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 narrow band of ground disturbances were found to have been the result of settling of the soft soil in a downhill motion. Soil liquefaction played a role within confined areas of the slide, but it was not responsible for all the motion at the site, and tectonic slip of faults in the area was also excluded as a cause.[23] Transportation[edit] See also: Southern California freeways Substantial disruption to about 10 miles of freeways in the northern San Fernando Valley took place, with most of the damage occurring at the Foothill Freeway / Golden State Freeway interchange, and along a five-mile stretch of Interstate 210. 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. Several landslides occurred between Balboa Boulevard and California State Route 14, but the most significant damage occurred at the two major interchanges. The Antelope Valley Freeway had damage from Newhall Pass to the northeast, primarily from settling and alignment issues, as well as splintering and cracking at the Santa Clara River and Solemint bridges.[24] Golden State Freeway – Antelope Valley Freeway Interchange Aerial view of the damage suffered by the Newhall Pass interchange. Main article: Newhall Pass interchange While the Newhall Pass interchange was still under construction at the time of the earthquake, the requisite components of the overpass were complete. Vibration caused two of the bridge's 191-foot sections to fall from a maximum height of 140 ft (43 m), along with one of the supporting pillars. The spans slipped off of their supports at either end due to lack of proper ties and insufficient space (a 14 in (360 mm) seat was provided) on the support columns. Ground displacement at the site was ruled out as a major cause of the failure, and in addition to the fallen sections and a crane that was struck during the collapse, other portions of the overpass were also damaged. Shear cracking occurred at the column closest to the western abutment, and the ground at the same column's base exhibited evidence of rotation.[25] Golden State Freeway – Foothill Freeway Interchange Interstate 210 / Interstate 5 overpass collapsed onto San Fernando Road Main articles: Interstate 5 in California and Interstate 210 and State Route 210 (California) This interchange is a broad complex of overpasses and bridges that was nearly complete at the time of the earthquake and not all portions were open to traffic. Several instances of failure or collapse at the site took place and two men were killed while driving in a pickup truck as a result. The westbound I-210 to southbound I-5, which was complete except for paving at the ramp section, collapsed to the north, likely because of vibration that moved the overpass off its supports due to an inadequate seat. Unlike the situation at the Antelope Valley Interchange, permanent ground movement (defined as several inches of left-lateral displacement with possibly an element of thrusting) was observed in the area. The movement contributed to heavy damage at the Sylmar Juvenile Hall facility, Sylmar Converter Station, and the Metropolitan Water District Treatment Plant, but its effects on the interchange was not completely understood as of a 1971 report from the California Institute of Technology.[25] Schools[edit] See also: Atwater Avenue Elementary School (Los Angeles); Bishop Alemany High School; John Marshall High School (Los Angeles); and Patrick Henry Middle School (Los Angeles, California) The large number of public school buildings in the Los Angeles area displayed mixed responses to the shaking, and those that were built after the enforcement of the Field Act clearly showed the results of the reformed construction styles. The Field Act was put into effect just one month following the destructive March 1933 Long Beach earthquake that damaged many public school buildings in Long Beach, Compton, and Whittier. The Los Angeles Unified School District had 660 schools consisting of 9,200 buildings at the time of the earthquake, with 110 masonry buildings that had not been reinforced to meet the new standards. More than 400 portable classrooms and 53 wood frame pre-Field Act buildings were also in use. All these buildings had been previously inspected with regard to the requirements of the Act, and many were reinforced or rebuilt at that time, but earthquake engineering experts recommended further immediate refurbishment or demolition after a separate evaluation was done after the February 1971 earthquake, and within a year and a half the district followed through with the direction with regard to about 100 structures.[26] At Los Angeles High School (20 mi (32 km) from Pacoima Dam) where the exterior walls of the main pre-Field Act building (constructed 1917) were unreinforced brick masonry, long portions of the parapet and the associated brick veneer broke off and some fragments fell through the roof to a lower floor, while other material landed on an exit stairway and into a courtyard area. The main building was demolished at a cost of $127,000, and none of the various post-Field Act buildings were damaged at the site. Except for the concrete gymnasium, all of the buildings at Sylmar High School (3.75 mi (6.04 km) from Pacoima Dam) were post-Field Act, one-story, wood construction. Abundant cracks formed in the ground at the site, and some foundations and many sidewalks were also cracked. The estimate for repairs at the site was $485,000. At 2 mi (3.2 km), Hubbard Street Elementary School was the closest school to Pacoima dam, and was also less than a mile from the Veterans Hospital complex. The wood frame buildings (classrooms, a multipurpose building, and some bungalows) were built after the Field Act, and damage and cleanup costs there totaled $42,000. Gas lines were broken and separation of the buildings' porches was due to lateral displacement of up to six inches.[26]

Aftermath[edit] See also: List of fault zones Following many of California's major earthquakes, lawmakers have acted quickly to develop legislation related to seismic safety. After the M6.4 1933 Long Beach earthquake the Field Act was passed the following month, and after the 1989 Loma Prieta earthquake, the Seismic Hazards Mapping Act and Senate Bill 1953 (hospital safety requirements) were established. Following the San Fernando event, earthquake engineers and seismologists from established scientific organizations, as well as the newly formed Los Angeles County Earthquake Commission, stated their recommendations that were based on the lessons learned. The list of items needing improvements included building codes, dams and bridges being made more earthquake resistant, hospitals that are designed to remain operational, and the restriction of development near known fault zones. New legislation included the Alquist-Priolo Special Studies Zone Act and the development of the Strong Motion Instrumentation Program.[27][28] Alquist-Priolo Special Studies Zone Act See also: Al Alquist 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. The act restricts construction of buildings designed for human occupancy across potentially active faults. Since it is presumed that surface rupture will likely take place where past surface displacement has occurred, the state geologist was given the responsibility for evaluating and mapping faults that had evidence of Holocene rupture, and creating regulatory zones around them called Earthquake Fault Zones. State and local agencies (as well as the property owner) were then responsible for enforcing or complying with the building restrictions.[28] California Strong Motion Instrumentation Program Prior to the San Fernando earthquake, some structural engineers had already believed that the existing groundwork for seismic design required enhancement. Although instruments had recorded a force of .33g during the 1940 El Centro earthquake, building codes only required structures to withstand a lateral force of .1g as late as the 1960s. Even at that time, engineers were against the idea of constructing buildings to resist the high forces that were seen in the El Centro shock, but after a 1966 earthquake peaked at .5g, and a maximum of 1.25g was observed at the Pacoima Dam during the San Fernando event, debate began as to whether that low requirement was sufficient.[27] Despite the compelling seismogram from the 1940 event in El Centro, strong-motion seismology was not explicitly sought until later events occurred—the San Fernando earthquake made evident the need for more data for earthquake engineering applications. 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. By the late 1980s, the program had instrumented more than 450 structures, bridges, dams, and power plants. The 1979 Imperial Valley and 1987 Whittier Narrows earthquakes were presented as gainful events that were recorded during that period, because both produced valuable data that increased knowledge of how moderate events affect buildings. The success of the Imperial Valley event was especially pronounced because of a recently constructed and fully instrumented government building that was shaken to the point of failure.[29][30]

See also[edit] Los Angeles portal California State Route 126 Interstate 105 (California) List of earthquakes in 1971 List of earthquakes in California Long Beach Search and Rescue San Gabriel Fault Wadsworth Chapel

References[edit] ^ Maley, R. P.; Cloud, W. K. (1971), "Preliminary strong-motion results from the San Fernando earthquake of February 9, 1971", The San Fernando, California, earthquake of February 9, 1971; a preliminary report published jointly by the U.S. Geological Survey and the National Oceanic and Atmospheric Administration, Geological Survey Professional Paper 733, United States Government Printing Office, p. 163  ^ SCEDC (2013). "Significant Earthquakes and Faults – San Fernando Earthquake". Southern California Earthquake Data Center.  ^ ISC (2014), ISC-GEM Global Instrumental Earthquake Catalogue (1900–2009), Version 1.05, International Seismological Centre  ^ a b c Allen, C. R.; Engren, G. R.; Hanks, T. C.; Nordquist, J. M.; Thatcher, W. R. (1971), "Main shock and larger aftershocks of the San Fernando earthquake, February 9 through March 1, 1971", The San Fernando, California, earthquake of February 9, 1971; a preliminary report published jointly by the U.S. Geological Survey and the National Oceanic and Atmospheric Administration, Geological Survey Professional Paper 733, United States Government Printing Office, pp. 17–19  ^ a b Stover, C. W.; Coffman, J. L. (1993), Seismicity of the United States, 1568–1989 (Revised) – U.S. Geological Survey Professional Paper 1527, United States Government Printing Office, p. 92  ^ a b c USGS (September 4, 2009), PAGER-CAT Earthquake Catalog, Version 2008_06.1, United States Geological Survey  ^ Reich, Kenneth (February 4, 1996). "'71 Valley Quake a Brush With Catastrophe". Los Angeles Times.  ^ Cloud & Hudson 1975, pp. 278, 287 ^ Morton, D. M.; Baird, A. K. (1975), "Tectonic setting of the San Gabriel mountains", San Fernando, California, earthquake of 9 February 1971, Bulletin 196, California Division of Mines and Geology, pp. 3, 5  ^ Yeats, R. (2012), Active Faults of the World, Cambridge University Press, pp. 111–114, ISBN 978-0-521-19085-5  ^ Steinbrugge, K. V.; Schader, E. E.; Bigglestone, H. C.; Weers, C. A. (1971). San Fernando Earthquake: February 9, 1971. Pacific Fire Rating Bureau. p. vii.  ^ Bolt, B. (2005), Earthquakes: 2006 Centennial Update – The 1906 Big One (Fifth ed.), W. H. Freeman and Company, pp. 106–107, ISBN 978-0716775485  ^ a b Kamb et al. 1971, pp. 41–43 ^ U.S Geological Survey Staff (1971), "Surface faulting", The San Fernando, California, earthquake of February 9, 1971; a preliminary report published jointly by the U.S. Geological Survey and the National Oceanic and Atmospheric Administration, Geological Survey Professional Paper 733, United States Government Printing Office, p. 57  ^ Kamb et al. 1971, p. 44 ^ Morton, D. M. (1971b), "Seismically triggered landslides in the area above the San Fernando Valley", The San Fernando, California, earthquake of February 9, 1971; a preliminary report published jointly by the U.S. Geological Survey and the National Oceanic and Atmospheric Administration, Geological Survey Professional Paper 733, United States Government Printing Office, p. 99  ^ a b Cloud & Hudson 1975, pp. 273, 277, 287 ^ Steinbrugge, Schader & Moran 1975, pp. 323–325 ^ Steinbrugge, Schader & Moran 1975, pp. 350–353 ^ a b c d Steinbrugge, Schader & Moran 1975, pp. 341–346 ^ a b Bolt, B.; Johnston, R. G.; Lefter, J.; Sozen, M. A. (1975), "The study of earthquake questions related to Veterans Administration hospital facilities", Bulletin of the Seismological Society of America, Seismological Society of America, 65 (4): 937, 938, 943–945  ^ a b Youd, T. L.; Olsen, H. W. (1971), "Damage to constructed works, associated with soil movements and foundation failures", The San Fernando, California, earthquake of February 9, 1971; a preliminary report published jointly by the U.S. Geological Survey and the National Oceanic and Atmospheric Administration, Geological Survey Professional Paper 733, United States Government Printing Office, pp. 126–129  ^ Smith, J. L.; Fallgren, R. B. (1975), "Ground displacement at San Fernando Valley Juvenile Hall and the Sylmar Converter Station", San Fernando, California, earthquake of 9 February 1971, Bulletin 196, California Division of Mines and Geology, pp. 157–158, 163  ^ California Division of Highways (1975), "Highway damage in the San Fernando earthquake", San Fernando, California, earthquake of 9 February 1971, Bulletin 196, California Division of Mines and Geology, p. 369  ^ a b Jennings, P. C.; Wood, J. H. (1971), "Earthquake damage to freeway structures", Engineering features of the San Fernando earthquake of February 9, 1971, California Institute of Technology, pp. 366–385  ^ a b Meehan, J. F. (1975), "Performance of public school buildings", San Fernando, California, earthquake of 9 February 1971, Bulletin 196, California Division of Mines and Geology, pp. 355, 356, 359–364  ^ a b Geschwind, C. (2001). California Earthquakes: Science, Risk, and the Politics of Hazard Mitigation. Johns Hopkins University Press. pp. 166, 170, 171. ISBN 978-0801865961.  ^ a b Bryant, W. A. (2010). "History of the Alquist-Priolo Earthquake Fault Zoning Act, California, USA" (PDF). Environmental & Engineering Geoscience. Geological Society of America. XVI (1): 7–10. doi:10.2113/gseegeosci.16.1.7.  ^ Lee, W. H. K. (2002), "Challenges in observational seismology", International Handbook of Earthquake & Engineering Seismology, Part A, Volume 81A (First ed.), Academic Press, p. 273, ISBN 978-0124406520  ^ Shakal, A. F.; Huang, M.; Ventura, C. E. (1988). The California Strong Motion Instrumentation Program: Objectives, Status, and Recent Data. from the 9th World Conference on Earthquake Engineering, Tokoyo, Japan, August 2–9, 1988. pp. 1–4.  Sources Allen, C.; Hanks, T. C.; Whitcomb, J. H. (1975), "Seismological studies of the San Fernando earthquake and their tectonic implications", San Fernando, California, earthquake of 9 February 1971, Bulletin 196, California Division of Mines and Geology, pp. 257–262  Cloud, W. K.; Hudson, D. E. (1975), "Strong motion data from the San Fernando, California, earthquake of February 9, 1971", San Fernando, California, earthquake of 9 February 1971, Bulletin 196, California Division of Mines and Geology, pp. 273–303  Kamb, B.; Silver, L. T.; Abrams, M. J.; Carter, B. A.; Jordan, T. H.; Minister, J. B. (1971), "Pattern of faulting and nature of fault movement in the San Fernando earthquake", The San Fernando, California, earthquake of February 9, 1971; a preliminary report published jointly by the U.S. Geological Survey and the National Oceanic and Atmospheric Administration, Geological Survey Professional Paper 733, United States Government Printing Office, pp. 41–54  Steinbrugge, K. V.; Schader, E. E.; Moran, D. F. (1975), "Building damage in the San Fernando Valley", San Fernando, California, earthquake of 9 February 1971, Bulletin 196, California Division of Mines and Geology, pp. 323–353 

External links[edit] San Fernando Earthquake – Southern California Earthquake Center Historic Earthquakes – San Fernando, California – United States Geological Survey California Geological Survey – About CSMIP – California Department of Conservation The International Seismological Centre has a bibliography and authoritative data for this event. Veterans Memorial Community Regional Park – Los Angeles County Department of Parks and Recreation v t e ← Earthquakes in 1971 → San Fernando (6.5–6.7, Feb 9) † Bingöl (6.9, May 22)†‡ Solomon Islands (8.0/8.1, July 14/26) † indicates earthquake resulting in at least 30 deaths ‡ indicates the deadliest earthquake of the year v t e Earthquakes in California Very Large (7.0–7.9) 1812 San Juan Capistrano (6.9–7.5) 1838 San Andreas (6.8–7.2) 1857 Fort Tejon (7.9) 1872 Lone Pine (7.4–7.9) 1892 Laguna Salada (7.1–7.2) 1906 San Francisco (7.8) 1952 Kern County (7.3) 1980 Eureka (7.3) 1992 Cape Mendocino (7.2) 1992 Landers (7.3) 1999 Hector Mine (7.1) 2010 Baja California (7.2) Large (6.0–6.9) 1868 Hayward (6.3–6.7) 1892 Vacaville–Winters (6.4, 6.2) 1898 Mare Island (5.8–6.4) 1918 San Jacinto (6.7) 1925 Santa Barbara (6.8) 1932 Eureka (6.4) 1933 Long Beach (6.4) 1940 El Centro (6.9) 1948 Desert Hot Springs (6.4) 1971 San Fernando (6.5–6.7) 1979 Imperial Valley (6.4) 1983 Coalinga (6.2) 1984 Morgan Hill (6.2) 1986 North Palm Springs (6.0) 1986 Chalfant Valley (6.2) 1989 Loma Prieta (6.9) 1992 Big Bear (6.5) 1994 Northridge (6.7) 2003 San Simeon (6.6) 2010 Eureka (6.5) 2014 South Napa (6.0) Moderate (5.0–5.9) 1957 San Francisco (5.7) 1969 Santa Rosa (5.6, 5.7) 1973 Point Mugu (5.8) 1979 Coyote Lake (5.7) 1987 Whittier Narrows (5.9) 1990 Upland (5.7) 1991 Sierra Madre (5.6) 2000 Yountville (5.0) 2007 Alum Rock (5.6) 2008 Chino Hills (5.5) v t e Earthquakes in the United States Historical 1638 New Hampshire 1663 Charlevoix 1700 Cascadia 1755 Cape Ann 1811–12 New Madrid 1838 San Andreas 1857 Fort Tejon 1865 Memphis 1867 Manhattan, Kansas 1868 Hawaii 1868 Hayward 1872 Lone Pine 1872 North Cascades 1886 Charleston 1887 Sonora 1892 Laguna Salada 1892 Vacaville–Winters 1898 Mare Island 20th-century 1906 San Francisco 1906 Aleutian Islands 1909 Wabash River 1915 Pleasant Valley 1916 Irondale 1918 San Jacinto 1925 Santa Barbara 1931 Valentine 1932 Eureka 1933 Long Beach 1935 Helena 1940 El Centro 1940 New Hampshire 1944 Cornwall–Massena 1946 Aleutian Islands 1947 Wisconsin 1948 Desert Hot Springs 1949 Olympia 1952 Kern County 1957 Andreanof Islands 1957 San Francisco 1959 Hebgen Lake 1964 Alaska 1965 Rat Islands 1965 Puget Sound 1968 Illinois 1969 Santa Rosa 1971 San Fernando 1973 Point Mugu 1975 Near Islands 1975 Morris 1975 Hawaii 1979 Coyote Lake 1979 Imperial Valley 1980 Eureka 1983 Coalinga 1983 Borah Peak 1984 Morgan Hill 1986 North Palm Springs 1986 Chalfant Valley 1987 Whittier Narrows 1989 Loma Prieta 1990 Upland 1991 Sierra Madre 1992 Cape Mendocino 1992 Landers 1992 Big Bear 1993 Scotts Mills 1993 Klamath Falls 1994 Northridge 1995 Marathon 1996 Duvall 1998 Pymatuning 1999 Hector Mine 2000 Yountville 21st-century 2001 Nisqually 2002 Denali 2003 Alabama 2003 San Simeon 2006 Gulf of Mexico 2006 Kiholo Bay 2007 Alum Rock 2008 Illinois 2008 Chino Hills 2010 Eureka 2010 Baja California 2010 Indiana 2011 Colorado 2011 Virginia 2011 Oklahoma 2014 Aleutian Islands 2014 Southeast Alaska 2014 South Napa 2016 Oklahoma 2016 Hawthorne 2018 Alaska Swarms 2001 Enola 2008 Reno 2010–11 Guy-Greenbrier 2012 Brawley 2009–18 Oklahoma Retrieved from "" Categories: Earthquakes in CaliforniaHistory of Los AngelesSan Fernando Valley1971 earthquakes1971 in CaliforniaDisasters in Los AngelesGeology of Los Angeles County, CaliforniaFebruary 1971 eventsHidden categories: Use mdy dates from February 2012Coordinates on Wikidata

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Sylmar_earthquake - Photos and All Basic Informations

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1971 San Fernando Earthquake Is Located In CaliforniaMoment Magnitude ScaleGeographic Coordinate SystemSierra Madre Fault ZoneFault (geology)Greater Los Angeles AreaSouthern CaliforniaUnited States DollarMercalli Intensity ScalePacoima DamSan Gabriel MountainsMoment Magnitude ScaleMercalli Intensity ScaleSan Fernando ValleySylmar, Los AngelesSan Fernando, CaliforniaOlive View – UCLA Medical CenterStrong Ground MotionUnited States Department Of Veterans AffairsSeismometerDam1933 Long Beach EarthquakeThrust TectonicsTransverse RangesSan Andreas FaultSierra Madre Fault ZoneSan Bernardino MountainsSanta Ynez MountainsSanta Monica MountainsChannel Islands Of CaliforniaLittle San Bernardino MountainsSan Jacinto Fault ZoneStrike And DipPaleomagnetismPacific PlateNorth American PlatePlate TectonicsTerraneSanta Barbara ChannelFault (geology)San Cayetano Fault1925 Santa Barbara Earthquake1994 Northridge EarthquakeQuaternaryEnlargeCalifornia Earthquake ForecastPacific Time ZoneCoordinated Universal TimeStrong Ground MotionFault BlockLos Angeles Metropolitan AreaBuilding Code1994 Northridge EarthquakeFault (geology)Sierra Madre Fault ZoneStrike And DipBedrockBarclay KambAftershockCalifornia Institute Of TechnologyPoint Mugu, CaliforniaCalifornia Department Of Water ResourcesMercalli Intensity ScaleSylmar, Los AngelesSan Fernando, CaliforniaKagel Canyon, CaliforniaGranada Hills, Los AngelesNewhall, Santa Clarita, CaliforniaLos AngelesNorthridge, Los AngelesMalibu, CaliforniaOntario, CaliforniaSanta Barbara, CaliforniaSan DiegoBarstow, CaliforniaLas VegasParkfield, CaliforniaBishop, CaliforniaMerced, CaliforniaMoss Landing, CaliforniaPalo Verde, CaliforniaPacoima DamLandslide ClassificationUnited States Air ForceAerial PhotographyRockfallSlump (geology)Sedimentary RockSeismogramSeismology1964 Alaska EarthquakeLocal OrdinanceBeverly Hills, CaliforniaUniform Building CodeHydraulic StructureSan Andreas FaultPacoima DamPeak Ground AccelerationAccelerometerGraniteArch DamConvento Building (Mission San Fernando)Mission San Fernando Rey De EspañaLos AngelesNewhall, Santa Clarita, CaliforniaSaugus, Santa Clarita, CaliforniaSanta Susana MountainsSanta Monica MountainsLos Angeles RiverVerdugo MountainsMidnight MissionEnlargeAlluvium1969 Santa Rosa EarthquakesVentura BoulevardSoil TypePrivate HospitalConcrete Masonry UnitOlive View – UCLA Medical CenterLos Angeles County, California1933 Long Beach EarthquakeEarthquake-resistant StructuresEnlargeBasementShear WallSlip JointEnlargeSeismometerUnited States Department Of Veterans AffairsNational Oceanic And Atmospheric AdministrationUniform Building CodeSeattle, WashingtonMemphis, TennesseeCharleston, South CarolinaBoston, MassachusettsEnlargeBaldwin Hills ReservoirBull Creek (Los Angeles County)SubsidenceHydraulic FillState Of CaliforniaLos Angeles Department Of Water And PowerSylmar Converter StationLos Angeles Department Of Water And PowerAlluvial FanSoil LiquefactionSouthern California FreewaysInterstate 210 (California)Interstate 5 In CaliforniaInterstate 405 (California)Balboa BoulevardCalifornia State Route 14Santa Clara River (California)EnlargeNewhall Pass InterchangeNewhall Pass InterchangeEnlargeInterstate 5 In CaliforniaInterstate 210 And State Route 210 (California)Pickup TruckCalifornia Institute Of TechnologyAtwater Avenue Elementary School (Los Angeles)Bishop Alemany High SchoolJohn Marshall High School (Los Angeles)Patrick Henry Middle School (Los Angeles, California)Field ActCompton, CaliforniaWhittier, CaliforniaLos Angeles Unified School DistrictMasonryPortable ClassroomTimber FramingLos Angeles High SchoolUnreinforced Masonry BuildingParapetSylmar High SchoolList Of Fault Zones1933 Long Beach Earthquake1989 Loma Prieta EarthquakeAl AlquistAlquist Priolo Special Studies Zone ActFault CreepActive FaultHolocene1940 El Centro EarthquakePacoima Dam1979 Imperial Valley Earthquake1987 Whittier Narrows EarthquakePortal:Los AngelesCalifornia State Route 126Interstate 105 (California)List Of Earthquakes In 1971List Of Earthquakes In CaliforniaLong Beach Search And RescueSan Gabriel FaultWadsworth ChapelUnited States Government Printing OfficeInternational Seismological CentreUnited States Government Printing OfficeUnited States Government Printing OfficeUnited States Geological SurveyLos Angeles TimesCalifornia Geological SurveyCambridge University PressInternational Standard Book NumberSpecial:BookSources/978-0-521-19085-5W. H. Freeman And CompanyInternational Standard Book NumberSpecial:BookSources/978-0716775485United States Government Printing OfficeUnited States Government Printing OfficeBruce BoltSeismological Society Of AmericaT. Leslie YoudUnited States Government Printing OfficeCalifornia Geological SurveyCalifornia Geological SurveyCalifornia Institute Of TechnologyCalifornia Geological SurveyJohns Hopkins University PressInternational Standard Book NumberSpecial:BookSources/978-0801865961Geological Society Of AmericaDigital Object IdentifierAcademic PressInternational Standard Book NumberSpecial:BookSources/978-0124406520Clarence Allen (geologist)Thomas C. HanksCalifornia Geological SurveyCalifornia Geological SurveyBarclay KambThomas H. JordanUnited States Government Printing OfficeCalifornia Geological SurveySouthern California Earthquake CenterUnited States Geological SurveyCalifornia Department Of ConservationLos Angeles County Department Of Parks And RecreationTemplate:Earthquakes In 1971Template Talk:Earthquakes In 1971Template:Earthquakes In 1970List Of Earthquakes In 1971Template:Earthquakes In 19721971 Bingöl Earthquake1971 Solomon Islands EarthquakesTemplate:Earthquakes In CaliforniaTemplate Talk:Earthquakes In CaliforniaList Of Earthquakes In California1812 San Juan Capistrano Earthquake1838 San Andreas Earthquake1857 Fort Tejon Earthquake1872 Lone Pine Earthquake1892 Laguna Salada Earthquake1906 San Francisco Earthquake1952 Kern County Earthquake1980 Eureka Earthquake1992 Cape Mendocino Earthquakes1992 Landers Earthquake1999 Hector Mine Earthquake2010 Baja California Earthquake1868 Hayward Earthquake1892 Vacaville–Winters Earthquakes1898 Mare Island Earthquake1918 San Jacinto Earthquake1925 Santa Barbara Earthquake1932 Eureka Earthquake1933 Long Beach Earthquake1940 El Centro Earthquake1948 Desert Hot Springs Earthquake1979 Imperial Valley Earthquake1983 Coalinga Earthquake1984 Morgan Hill Earthquake1986 North Palm Springs Earthquake1986 Chalfant Valley Earthquake1989 Loma Prieta Earthquake1992 Big Bear Earthquake1994 Northridge Earthquake2003 San Simeon Earthquake2010 Eureka Earthquake2014 South Napa Earthquake1957 San Francisco Earthquake1969 Santa Rosa Earthquakes1973 Point Mugu Earthquake1979 Coyote Lake Earthquake1987 Whittier Narrows Earthquake1990 Upland Earthquake1991 Sierra Madre Earthquake2000 Yountville Earthquake2007 Alum Rock Earthquake2008 Chino Hills EarthquakeTemplate:Earthquakes In The United StatesTemplate Talk:Earthquakes In The United StatesList Of Earthquakes In The United States1638 New Hampshire Earthquake1663 Charlevoix Earthquake1700 Cascadia Earthquake1755 Cape Ann Earthquake1811–12 New Madrid Earthquakes1838 San Andreas Earthquake1857 Fort Tejon Earthquake1865 Memphis Earthquake1867 Manhattan, Kansas Earthquake1868 Hawaii Earthquake1868 Hayward Earthquake1872 Lone Pine Earthquake1872 North Cascades Earthquake1886 Charleston Earthquake1887 Sonora Earthquake1892 Laguna Salada Earthquake1892 Vacaville–Winters Earthquakes1898 Mare Island Earthquake1906 San Francisco Earthquake1906 Aleutian Islands Earthquake1909 Wabash River Earthquake1915 Pleasant Valley Earthquake1916 Irondale Earthquake1918 San Jacinto Earthquake1925 Santa Barbara Earthquake1931 Valentine Earthquake1932 Eureka Earthquake1933 Long Beach Earthquake1935 Helena Earthquake1940 El Centro Earthquake1940 New Hampshire Earthquakes1944 Cornwall–Massena Earthquake1946 Aleutian Islands Earthquake1947 Wisconsin Earthquake1948 Desert Hot Springs Earthquake1949 Olympia Earthquake1952 Kern County Earthquake1957 Andreanof Islands Earthquake1957 San Francisco Earthquake1959 Hebgen Lake Earthquake1964 Alaska Earthquake1965 Rat Islands Earthquake1965 Puget Sound Earthquake1968 Illinois Earthquake1969 Santa Rosa Earthquakes1973 Point Mugu Earthquake1975 Near Islands Earthquake1975 Morris Earthquake1975 Hawaii Earthquake1979 Coyote Lake Earthquake1979 Imperial Valley Earthquake1980 Eureka Earthquake1983 Coalinga Earthquake1983 Borah Peak Earthquake1984 Morgan Hill Earthquake1986 North Palm Springs Earthquake1986 Chalfant Valley Earthquake1987 Whittier Narrows Earthquake1989 Loma Prieta Earthquake1990 Upland Earthquake1991 Sierra Madre Earthquake1992 Cape Mendocino Earthquakes1992 Landers Earthquake1992 Big Bear Earthquake1993 Scotts Mills Earthquake1993 Klamath Falls Earthquakes1994 Northridge Earthquake1995 Marathon Earthquake1996 Duvall Earthquake1998 Pymatuning Earthquake1999 Hector Mine Earthquake2000 Yountville Earthquake2001 Nisqually Earthquake2002 Denali Earthquake2003 Alabama Earthquake2003 San Simeon Earthquake2006 Gulf Of Mexico Earthquake2006 Kiholo Bay Earthquake2007 Alum Rock Earthquake2008 Illinois Earthquake2008 Chino Hills Earthquake2010 Eureka Earthquake2010 Baja California Earthquake2010 Indiana Earthquake2011 Colorado Earthquake2011 Virginia Earthquake2011 Oklahoma Earthquake2014 Aleutian Islands Earthquake2014 Palma Bay Earthquake2014 South Napa Earthquake2016 Oklahoma Earthquake2016 Hawthorne Earthquakes2018 Gulf Of Alaska EarthquakeEnola Earthquake Swarm2008 Reno EarthquakesGuy-Greenbrier Earthquake SwarmBrawley Seismic Zone2009–18 Oklahoma Earthquake SwarmsHelp:CategoryCategory:Earthquakes In CaliforniaCategory:History Of Los AngelesCategory:San Fernando ValleyCategory:1971 EarthquakesCategory:1971 In CaliforniaCategory:Disasters In Los AngelesCategory:Geology Of Los Angeles County, CaliforniaCategory:February 1971 EventsCategory:Use Mdy Dates From February 2012Category:Coordinates On WikidataDiscussion About Edits From This IP Address [n]A List Of Edits Made From This IP Address [y]View The Content Page [c]Discussion About The Content Page [t]Edit This Page [e]Visit The Main Page [z]Guides To Browsing 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