TYPE OF FAULTING: thrust. The 1971 San Fernando Earthquake. The epicenter was located approximately 10 km northeast of LSFD at a focal depth of approximately 9 km. LAFD History – The Sylmar Tunnel Explosion: June 23, 1971. 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. Heaviest death toll was in San Fernando Valley, epicenter of the jolting, rumbling temblor. On February 9, 1971, the magnitude 6.5 San Fernando earthquake in the suburbs of Los Angeles was one big surprise that day. The 1971 San Fernando (a.k.a. • The epicenter of the magnitude 6.6 disastrous earthquake was in the foothills of the San Gabriel Mountains, at the northeastern edge of the Valley. Download a PDF of "San Fernando Earthquake of February 9, 1971" by the National Research Council for free. The unanticipated thrust earthquake had a magnitude of 6.5 on the ṃ scale, and a maximum Mercalli intensity of XI (Extreme). Seismologists call it the "San Fernando earthquake", as does the United States Geological Survey (USGS). It led to 64 deaths and more than $500 million in damage. The 1971 San Fernando earthquake (also known as the Sylmar earthquake) occurred in the early morning of February 9 in the foothills of the San Gabriel Mountains in southern California. Material from 1971 San Fernando earthquake was split to Sierra Madre Fault Zone on 23:28, 19 March 2017 from this version. The San Fernando Earthquake ofFebruary 9, 1971, offered a unique opportunity to assess many ofthe important scientific, engineering, and human concerns associated with earthquakes in a modern urban environment. The San Fernando Fault is a thrust fault , which means a section of land above the fault moved up … The 1971 San Fernando earthquake shook loose a massive slide in the upstream slope of the Lower San Fernando Dam that lowered the crest about 30 feet. On February 9th, 1971, magnitude 6.6 earthquake shook the San Fernando Valley in southern California for 12 seconds. The magnitude-6.6 temblor was the worst the region had experienced for decades. Wednesday, February 17, 2021. Explore. Bottom line: the 1971 Sylmar quake in Los Angeles produced the most destructive power of any earthquake in California since the Fort Tejon quake in 1857 (Richter 7.9). The unanticipated thrust earthquake had a magnitude of 6.5 on the Ms scale, and a maximum Mercalli intensity of XI (Extreme). By: Davis, Craig A., Yu, Kent, and Taciroglu, Ertugrul DOI: 10.34948/N3QP4X There has been 50-years of progress in lifeline earthquake engineering since its inception as a primary field of practice following the 1971 San Fernando Earthquake in … The quake’s epicenter was located five miles north of the San Fernando Valley, near the The Van Norman Dam, which at the time was the main water supply for the San Fernando Valley, was in its immediate path. The 1971 San Fernando quake led the USGS and Caltech to join forces, expanding seismic monitoring through the region. On February 9, 1971 a 6.5 rated earthquake struck Southern California near the city of San Fernando causing 64 fatalities, 3400 injuries and over 5 million dollars in property damage. Print. The 1971 San Fernando earthquake (also known as Sylmar earthquake) struck the San Fernando Valley near Sylmar at 6:00:55 a.m. PST on Feb. 9, 1971, with a magnitude of 6.6. LOCATION: 34° 24.67' N, 118° 24.04' W. MAGNITUDE: M W 6.5. Search again. 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. The quake happened at 6am Pacific Standard Time. earthquake that occurred on the morning of February 9, 1971, and measured a 6.6 on the Richter Scale. The 1971 San Fernando earthquake (also known as the Sylmar earthquake) occurred in the early morning of February 9 in the foothills of the San Gabriel Mountains in southern California. Sylmar seemed jinxed when another disaster, a few months after the earthquake, hit the area. It is postulated that the initial event took place at depth on the Sierra Madre fault zone which runs along the base of the San Gabriel Mountains. 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. We still plan to mark the event anniversary with a special online program from 12-1 pm on February 9, 2021. Approximations used in that work are checked in this report using more exact methods. The model is then modified to fit observations of an aftershock of the 1975 Oroville earthquake. (Author). The quake’s epicenter was located five miles north of the San Fernando Valley, near the Feb 24, 2016 - 1971 San Fernando earthquake - Wikipedia, the free encyclopedia. Why California is Safer Because of the 1971 San Fernando Earthquake #SanFernando71 “The San Fernando Earthquake changed how the state approached earthquake hazards,” said Dr. Steve Bohlen, Acting State Geologist of California and head of the California Geological Survey. Sylmar) earthquake (Mw = 6.6) occurred in the early morning hours of February 9. The collapse cut off a main north south route. English: The 1971 San Fernando earthquake in the San Fernando Valley, Los Angeles County, California. 1971 San Fernando earthquake. The presence in California of major universities with strong and active earthquake research This paper compares the distribution of damage from the San Fernando, 1971, and Northridge, 1994, earthquakes. On Feb. 9, 1971, the deadly San Fernando Earthquake rattled Southern California, leaving more than 60 people dead and causing more than $500 million in property damage. Also known as the Sylmar Earthquake, the magnitude-6.5 quake was reported on a Tuesday at about 6:01 a.m. The epicenter of the quake was located in the San Gabriel Mountains, with numerous nearby Los Angeles communities affected. Today. San Francisco Earthquake 1906. Measuring a magnitude of 6.6 on the Richter scale, it occurred on 9 February 1971 and created a liquefaction failure at the Lower San Fernando dam and reservoir on the northern edge of the greater metropolitan Los Angeles area. The 1971 San Fernando Earthquake — sometimes referred to as the Sylmar earthquake — struck the Sylmar area right at 6 a.m. on Feb. 9, wreaking death and destruction throughout the region. Off., 254 p. Part or all of this report is presented in Portable Document Format (PDF). The 1971 San Fernando and 1994 Northridge earthquakes were two such landmarks in terms of building codes. The risk of an aftershock forced the three-day evacuation of residents of … This monograph attempts to amalgamate recent research input comprising the vivifying components or urban seismology at a level useful to those having an interest in the earthquake and its effects upon an urban environment. Sylmar seemed jinxed when another disaster, a few months after the earthquake, hit the area. From left: Duane L. Georgeson, Jules Bergman examine damage in the aftermath of the Sylmar Earthquake / 1971 San Fernando earthquake, in the Walt Disney Television via Getty Images / … Search again. Wikipedia article … February 9 marks 50 years since the devastating 1971 San Fernando earthquake that rocked Los Angeles. 1971. Feb 24, 2016 - 1971 San Fernando earthquake - Wikipedia, the free encyclopedia. "Anytime" came Feb. 9, 1971, when the Santa Clarita and San Fernando valleys were devastated by the 6.6-magnitude "Sylmar" earthquake, aka San Fernando earthquake, whose actual epicenter was in the Iron Canyon section of Sand Canyon in the SCV. The unanticipated thrust earthquake had a magnitude of 6.5 on the Ms scale, and a maximum Mercalli intensity of XI (Extreme). The 1971 San Fernando earthquake (also known as the Sylmar earthquake) occurred in the early morning of February 9 in the foothills of the San Gabriel Mountains in southern California. Saved by David. C. R. Allen and his co‐workers assigned the main shock parameters: 34°24.7′N, 118°24.0′W, focal depth h = 8.4 km, and local magnitude M L = 6.4. San Fernando Earthquake 1971. 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 20th century. • The epicenter of the magnitude 6.6 disastrous earthquake was in the foothills of the San Gabriel Mountains, at the northeastern edge of the Valley. Contact seller. Earthquake title=1971 San Fernando earthquake date= 9 February 1971 magnitude = 6.6 M w depth=convert|8.4|km|mi|sp=us location=coord|34.416|N|118.37|W|region:US|display=inline countries affected = USA (Southern California) casualties = 65 killedThe 1971 San Fernando earthquake (also known as Sylmar earthquake) struck the San Fernando … The 1971 San Fernando earthquake (also known as the Sylmar earthquake) occurred in the early morning of February 9 in the foothills of the San Gabriel Mountains in southern California. TIME: February 9, 1971 / 6:01 am PST. Trace of the main reverse fault where it crosses Little Tujunga Road. The slide carried away much of the crest and upstream concrete facing of the 2,100-foot-long dam. The San Fernando earthquake has been extensively studied by many seismologists, geologists, and earthquake engineers. This report extracts significant facts learned from past earthquake investigations between 1971 and 1986 and covers a range of disciplines. Topics for future research are suggested. San Fernando Earthquake. The earthquake is known by different names. It prompted Governor Ronald Reagan to declare Los Angeles County a disaster area and President Richard Nixon to send Vice President Spiro Agnew to inspect the area. 10. Category:1971 San Fernando earthquake. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. The 1971 San Fernando earthquake damaged the Lower San Fernando Dam, which sits less than half-mile above the neighborhoods of the San Fernando Valley in southern California. That’s because a fault with the provocative name of the Santa Susana thrust exhibited a lot of movement that day, with the result being an earthquake measured at 6.6 at its epicenter. Yet, according to geologists, this disaster was only seconds away from being a really bad disaster to a historic catastrophic disaster. It is evident, however, that more faults in the San Fernando Valley area may be active today than are now recognized." The San Fernando, California, Earthquake of February 9, 1971, 1971. found : Wikipedia, Feb. 24, 2006 (The Sylmar earthquake struck at 6:00:55 a.m. PST on the morning of February 9, 1971. The San Fernando earthquake (also known as the Sylmar earthquake) rumbled along a 12.5-mile fault area beneath the foothills of the San Gabriel Mountains, across the San Fernando Valley in southern California, at about 6:00 a.m. on Feb. 9, 1971. On February 9, 1971, just after 6:00 a.m., a M6.5 earthquake struck the San Gabriel mountains, in the northwestern part of Los Angeles County. Types of data acquired from dwelling inspections after the 1971 San Fernando earthquake A3 Evolving Codes: Ductility Example. Upper and Lower San Fernando Dams in the 1971 Earthquake X. S. Li Hong Kong University of Science and Technology 11/10/2003. The 1971 San Fernando earthquake (also known as the Sylmar earthquake) occurred in the early morning of February 9 in the foothills of the San Gabriel Mountains in southern California. The event was one in a series that affected Los Angeles county in the late 20th century. Description. Woodland Hills California Southern California San Gabriel Valley Earthquake And Tsunami Canoga Park San Luis Obispo County San Fernando Valley California History Valley Girls. The magnitude 6.6 Sylmar earthquake shook Southern California on Feb. 9, 1971, causing significant damage and 64 deaths. The epicenter of the earthquake was in the vicinity of Magic Mountain, about six … The scarp indicates more than 1-meter reverse dip-slip movement. Advances in structural dynamics by the late 1960s encouraged structural engineers to consider not only seismic forces, but also the movement or “ductility” a structure must undergo in an earthquake. The san fernando earthquake occurred on february 9, 1971, at 6:00:41 am pacific standard time (14:00:41 utc) with a strong ground motion duration of about 12 seconds as recorded by seismometers, although the whole event was reported to have lasted about 60 seconds. The San Fernando, California, earthquake of February 9, 1971: a preliminary report; geological survey professional paper 733. The largest events in the San Fernando earthquake series, initiated by the main shock at 14h 00m 41.8s UT on February 9, 1971, were chosen for analysis from the first three months of activity, 87 events in all. Damage was locally severe in the northern San Fernando Valleyand surface faulting was extens… On February 9, 1971 at 6:01 am PST, a devastating M6.6 earthquake struck the densely populated metropolitan area of Los Angeles, leaving death and destruction in its wake. During the early morning hours of February 9, 1971, a 6.5 magnitude earthquake centered in the Sylmar area of the San Fernando Valley shook Los Angeles. The 1971 San Fernando earthquake (also known as the Sylmar earthquake) occurred in the early morning of February 9 in the foothills of the San Gabriel Mountains in southern California. Fourteen persons were killed today, nine of them in hospitals as a minute-long earthquake rolled over Los Angeles and suburbs at 6:02 a.m. The quake lasted technically for 12 seconds – it felt like a lot more than that! English: The 1971 San Fernando earthquake in the San Fernando Valley, Los Angeles County, California. Search our library’s catalog with this term. The 1971 San Fernando earthquake, also known as the “Sylmar Quake,” took place on the morning of February 9, 1971 around 6:01am. FAULT INVOLVED: San Fernando fault zone; minor offset reported on the eastern Santa Susana fault zone. The San Fernando earthquake (also known as the Sylmar earthquake) was a magnitude 6.6 earthquake that struck on February 9th, 1971 at 6:00 AM PST. The earthquake was generated by thrust faulting on the Sierra Madre fault. Tuesday marks 50 years since the 1971 Sylmar-San Fernando earthquake unleashed its fury on Los Angeles just after 6 a.m. The Lockheed Shipbuilding and Construction Company of Seattle was digging a 5.5 mile-long tunnel, 170 feet underground, for the Metropolitan Water District’s Feather River Project. The death toll of this earthquake was about 58, but the property damage was enormous. The 1971 San Fernando earthquake (also known as the Sylmar earthquake) occurred in the early morning of February 9 in the foothills of the San Gabriel Mountains in southern California. 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. Advances in structural dynamics by the late 1960s encouraged structural engineers to consider not only seismic forces, but also the movement or “ductility” a structure must undergo in an earthquake. The two geologists Carl Wentworth and Robert Yerkes from the US Geological Survey in Pasadena later wrote that "the San Fernando fault was discovered to be active only when it ruptured the ground surface on February 9, 1971. When autocomplete results are available use up and down arrows to review and enter to select. The southern California soil shook violently the morning of February 9, 1971. Off., 254 p. Part or all of this report is presented in Portable Document Format (PDF). 1971 San Fernando Valley, CA earthquake (M 6.6) – damage from ground shaking (note time on clock) St_SF_EQ-39 1971 San Fernando Valley, CA earthquake (M 6.6) – Rayleigh waves crossing a field during an aftershock . By the time this photograph was taken 0830 11 February 1971) a dirt ramp at right had been built up the scarp. Both events had similar size, occurred on blind thrust faults beneath the densely populated San Fernando Valley of the Los Angeles metropolitan area, and hence offer a rare opportunity to compare the effects of the two earthquakes. The 1971 San Fernando earthquake (also known as the Sylmar earthquake) happened in the early morning of February 9 in the San Gabriel Mountains.It was at the northern edge of the San Fernando Valley in southern California.The quake measured 6.6 on the Richter scale.The damage was severe near the San Fernando Valley. The magnitude-6.6 temblor was the worst the region had experienced for decades. 1971 San Fernando earthquake - Collapse of four buildings at the Veterans Hospital - The earthquake killed 60 and cost $1 billion in damages. When the Sylmar-San Fernando earthquake struck Southern California in 1971, 64 people were killed and more than 2,500 injured. But at 42 seconds after 6 a.m. on a Tuesday morning 25 years ago this week, Feb. 9, 1971, the Sylmar-San Fernando earthquake hit the Valley and … The other surprise … Sylmar, Los Angeles1971 San Fernando earthquakeAntelope ValleyEmergency! Abstract. The magnitude 6.6 earthquake left 65 dead; injured another 2,000 people and caused half a billion dollars in damage (about $3.2 billion today). The Lockheed Shipbuilding and Construction Company of Seattle was digging a 5.5 mile-long tunnel, 170 feet underground, for the Metropolitan Water District’s Feather River Project. The 1971 San Fernando and 1994 Northridge earthquakes were two such landmarks in terms of building codes. San Diego. The 1971 San Fernando earthquake (also known as the Sylmar earthquake) occurred in the early morning of February 9 in the foothills of the San Gabriel Mountains in southern California. Abstract. But at 42 seconds after 6 a.m. on a Tuesday morning 25 years ago this week, Feb. 9, 1971, the Sylmar-San Fernando earthquake hit the Valley and … The 1971 San Fernando earthquake, also known as Sylmar earthquake, struck the San Fernando Valley near Sylmar at 6:00:55 a.m. PST on Feb. 9, 1971, with a magnitude of 6.6. On Feb. 9, 1971, the deadly San Fernando Earthquake rattled Southern California, leaving more than 60 people dead and causing more than $500 million in … Lower and Upper San Fernando Dams after 1971 Earthquake Steinbrugge Collection, Earthquake Engineering Research Center Photo: Cluff, LLoyd motions recorded during the 1971 San Fernando earthquake. 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 … As shown in the photograph at right, only a narrow shattered wall of dirt remained. San Francisco Earthquake 1906. One of the hardest-hit buildings was the just-completed San Fernando Veterans Administration Hospital, whose unreinforced concrete wings collapsed, killing at … The 1971 earthquake ruptured a subsection named the San Fernando Fault Zone, which extends from the western San Fernando Valley to Big Tujunga Wash, about 12 and a half miles (20 km) across. Evolving Codes: Ductility Example. 1971 San Fernando (California) Earthquake Archive. However, motions of many more buildings recorded during recent earthquakes, including the 1989 Lorna Prieta and 1994 Northridge earthquakes, are now available. earthquake that occurred on the morning of February 9, 1971, and measured a 6.6 on the Richter Scale. Published by US Geological Survey and National Oceanic and Atmosphere Administration at the USGPO, Washington (1971) Seller: Bolerium Books Inc., San Francisco, CA, U.S.A. Not the oft-referenced "big one," this magnitude 6.6 earthquake nonetheless caused 65 fatalities, 2,000 additional casualties, and damage of about $3.2 billion in today's dollars. 1971 San Fernando M6.6 earthquake Occurring just after 6 a.m., the San Fernando Earthquake was a wake-up call in every sense. One of the motivations for scheduling the original event in February 2021 was to mark the 50-year anniversary of the 1971 San Fernando earthquake, which was a seminal event in the history of Lifelines Earthquake Engineering. The hospital was severely damaged six weeks after it opened during the 6.5–6.7 1971 San Fernando earthquake (February 9, 1971), which caused the collapse of the four stairwell wings, as well as the parking structure. THE 1971 SAN FERNANDO EARTHQUAKE. In the San Fernando earthquake, the number of deaths (65), of people sustaining serious injuries (over 1,000) and amount of major structural damage was almost entirely confined to portions of San Fernando and Tujunga Valleys, and the Newhall-Saugus area (map, page 62). San Fernando Rd. On February 9, 1971 a 6.5 rated earthquake struck Southern California near the city of San Fernando causing 64 fatalities, 3400 injuries and over 5 million dollars in property damage. What few realized at the time was how close it … DEPTH: 8.4 km. U.S. Govt. H alf a century ago, a 6.6-magnitude earthquake shook Southern California in the early morning of Feb. 9, 1971, causing 64 deaths and major damage to critical infrastructure. San Fernando Earthquake 1971. 1971 2/09 14:01 UTC 34.40N 118.39W 5km deep Ms=6.5, San Fernando, California. At 6:00 a.m. on February 9, 1971, a magnitude 6.6 earthquake - the first large quake in the Los Angeles area in nearly 38 years -- shook the Southland, and was centered in the San Gabriel Mountains north of Sylmar. Sixty four people lost their lives in the temblor, the first significant quake since the 6.4 Long Beach Earthquake in... 1971 San Fernando Earthquake Collapsed Freeway Overpasses About This Piece Interstate and Highway were closed the inland main highway from Los Angeles to San Francisco The quake measured on the Richter Scale Sylmar California Feb Cultural Art Never lose touch with your roots or embrace a new culture with world art. Print. The 1971 San Fernando-Sylmar earthquake, which measured 6.7 on the Richter scale of ground motion, occurred on a buried fault that was later named the Sierra Madre fault. On February 9, 1971, a magnitude 6.6 earthquake shook the San Fernando Valley -- the first in the L.A. area in nearly 38 years -- caused major damage in the community of Sylmar. Evidence is presented which suggest that the 1971 San Fernando earthquake may have been a double event that occurred on two separate, subparallel thrust faults. 50 years after the 1971 San Fernando Earthquake Structural impacts and subsequent earthquakes on the California Hospital Seismic Program. Touch device users, explore by touch or with swipe gestures. The San Fernando Earthquake of 1971 (also known as Sylmar earthquake occurred) to February 9, 1971 at 6:00:55 am local time (14:00 UTC) in the San Fernando Valley near Sylmar, a suburb of Los Angeles, with a magnitude M w of 6.6.. The 1971 San Fernando, or Sylmar, earthquake was the worst to hit an urban area of California since the 1933 magnitude-6.4 Long Beach quake. 50th Anniversary of the San Fernando Earthquake. U.S. Govt. The earthquake that rocked the northern San Fernando Valley, near Sylmar measured magnitude 6.6 on the Richter magnitude scale. The San Fernando Earthquake, also called the Sylmar Earthquake, struck at 6 a.m. on February 9, 1971 just north of the San Fernando Valley. It was the worst recorded quake in the city's history. The 6.6 magnitude earthquake with an epicenter located along a 12 mile fault zone below the San Gabriel Mountains lasted approximately 12 seconds and affected the entire San Fernando Valley. Search our library’s catalog with this term. This "Instrumental Intensity" is based on a combined regression of peak acceleration and velocity amplitudes vs. observed intensity for eight significant California earthquakes (1971 San Fernando, 1979 Imperial Valley, 1986 North Palm Springs, 1987 Whittier, 1989 Loma Prieta, 1991 Sierra Madre, 1992 Landers, and 1994 Northridge). According to USGS, the San Fernando quake, also known as the Sylmar earthquake, is one of the deadliest earthquakes in California history. The largest events in the San Fernando earthquake series, initiated by the main shock at 14h 00m 41.8s UT on February 9, 1971, were chosen for analysis from the first three months of activity, 87 events in all. The former page's history now serves to provide attribution for that content in the latter page, and it must not be deleted so long as the latter page exists. The 1971 earthquake was a massive disaster resulting in collapsed freeways, destroyed homes, and way too many ruined lives. The event was one in a series that affected the Los Angeles area in the late … It led to 64 deaths and more than $500 million in damage. 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). 12:00pm-1:00pm. San Fernando Earthquake, February 9, 1971, 6:01am PST. St_SF_EQ-8 1971 San Fernando Valley, CA Graph showing recommended loss over deductible versus deductible, based on equations 4-6 A60 TABLES 1. The 1971 San Fernando, or Sylmar, earthquake was the worst to hit an urban area of California since the 1933 magnitude-6.4 Long Beach quake. Category:1971 San Fernando earthquake. Map showing the city of San Fernando and the Sylmar and Pacoima districts of Los Angeles, which were part of the 1971 San Fernando earthquake region A59 15. The 1971 San Fernando earthquake (also known as the Sylmar earthquake) occurred in the early morning of February 9 in the foothills of the San Gabriel Mountains in southern California. The San Fernando Fault, located 6 mi northwest of Burbank's downtown, caused the 6.6 magnitude 1971 San Fernando earthquake. San Fernando earthquake is noted down in history as one of Southern California's significant seismic events. 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