san fernando valley earthquake 1971

Download a PDF of "San Fernando Earthquake of February 9, 1971" by the National Research Council for free. San Fernando Valley earthquake of Feb. 1971, Sylmar, California Public Domain By the late 1990s, the San Fernando Valley had become more urban and more ethnically diverse with rising poverty and crime. The colored dots represent locations of the respective aftershocks of each quake. The documentary moves along quickly and uses actual newsreel footage as well as well-staged re-enactments, blended together in a leanly edited narrative. The unanticipated thrust earthquake had a moment magnitude of 6.5 or 6.7 (as determined by several independent institutions) and â¦ Figure 1: After the partial collapse of the Van Norman Dam in the San Fernando earthquake, the water came dangerously close to overtopping the dam. It bans construction on active faults in California. The earthquake that rocked the northern San Fernando Valley, near Sylmar measured magnitude 6.6 on the Richter magnitude scale. This was struck by the earthquake on February 9th of 1971. This is the San Fernando Valley. But the threat of disaster didn't end when the shaking stopped. 1971 San Fernando (California) Earthquake Archive. The historical San Francisco earthquake of 1906 measured the same (XI Extreme) in four locations just to the north of San â¦ REPORTS San Fernando Earthquake of 9 February 1971: Pattern of Faulting Abstract. Southern California San fernando earthquake of 9 february 1971: pattern of faulting. It occurred at 6:00:41. But even now, after further detailed studies, they are not sure whether they have identified all blind faults in the area or if the valley's inhabitants are in for more surprises. Final report}, author = {Schiff, A J and Yao, J T.P. Both the Veteran's Administration Hospital and Olive View Medical Center in Sylmar were severely damaged, accounting for many of the deaths. Residents along the 405 Freeway were evacuated for days until the dam was shored up and determined to be safe. Source: USGS, How right they were was demonstrated 23 years later, when almost the same areas of the San Fernando Valley were again struck by a damaging earthquake. ‘The Incredibles' Lead a New Safety Campaign in OC and LA, Free Or Cheap Things Angelenos Can Do From Home, Disney Artifacts Go to Auction in Honor of Walt's Birthday, Wind and Red Flag Weather Drive Fires in Southern California Ahead of Holidays, Copyright © 2020 NBCUniversal Media, LLC. @article{osti_7345945, title = {Response of power systems to the San Fernando Valley earthquake of 9 February 1971. Blind Thrust In comparison, both the Loma Prieta (1989) and Northridge (1994) quakes measured âIX Violentâ on the Mercalli Scale, two steps below this quake (the Sylmar Earthquake, 1971). 21st century Contemporary era. 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. Figure 2: Earthquakes on two blind thrust faults caused severe damage in the San Fernando Valley. However, when you live in earthquake country, you might want to give the question a second thought. Windows shattered. The epicenter was located approximately 10 km northeast of â¦ ", Figure 2: Earthquakes on two blind thrust faults caused severe damage in the San Fernando Valley. 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 Slides in the San Fernando Dams During the Earthquake of February 9, 1971. Later, scientists at UCLA estimated that flooding following the collapse of the dam could have killed between 70,000 and 120,000 people. Part of the dam crumbled in the quake, and more damage was reported with each aftershock. The aftermath led to major changes for building construction and the Alquist-Priolo Act. Following these to earthquakes, geologists are now sure that many more of these hidden faults crisscross deep beneath the San Fernando Valley. The San Fernando earthquake, 1971: Assessed at Richter magnitude 6.6, it occurred in the mountains behind Sylmar. Science. The quake took place at 6 am under the town of Sylmar. The San Fernando Earthquake, 1971. 1971 May 14;172(3984):712-5. Preparedness, Risks, and Hazards There are various names for this earthquake. 4-5. It was followed up by two large aftershocks. Later known as the San Fernando Earthquake, the quake was responsible for $500 million dollars worth of damage and causes 65 deaths (most of the deaths occurred when the Veteran's â¦ There are various names for this earthquake. Yerkes -- Main shock and larger aftershocks of the San Fernando earthquake, February 9 through March 1, 1971 / C.R. May 1, 2020 - Explore David's board "sylmar earthquake 1971" on Pinterest. But when seismologists checked the epicentral area they realized that for about 6 miles a fault along the foothills of the San Gabriels had broken through the surface during the quake. This shaking occurs when stress that builds up in the crust is â¦ 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. Known as the San Fernando earthquake or the Sylmar earthquake, it caused 58 deaths and more than $500 million in damage. San Fernando Valley Earthquake 1971 Sylmar California. The question of whether it is wise to live below a dam behind which millions of acre feet of water are stored is usually rather low on people's lists of daily worries. This event included 4 aftershock quakes with magnitudes around 5. There are various names for this earthquake. Today in Earthquake History, February 9, 2017 1. It caused hospitals and schools to collapse, brought down sections of elevated freeways and cost 64 people their lives. | 1971 2/09 14:01 UTC 34.40N 118.39W 5km deep Ms=6.5, San Fernando, California. USGS 'Sylmar Quake' or 'Sylmar earthquake' is â¦ At the 140-ft high Lower dam, the entire upstream face slid into the reservoir leaving only 5 ft of freeboard. Forty-six years ago today, the possibility of such a sudden dam burst was the hair-raising fear, in the chaos and devastation following the magnitude 6.7 earthquake that struck the San Fernando Valley north of Los Angeles. (The earthquake of 9-Feb-1971). | 28:14. 2:38. The red line is the fault on which the Northridge quake occurred in 1994. 0:51. PACOIMA (CBSLA) â A 4.2-magnitude earthquake struck the Pacoima area of the San Fernando Valley early Thursday morning and was felt across the Southland. Please leave this template in place to link the article â¦ Antelope Valley Freeway Collapse (1971/1994): This occurred at a highway interchange at Newhall Pass, north of Sylmar; Southern California The failure of the Interstate 5/14 interchange in 1971 â¦ Type of Faulting: thrust Time: February 9, 1971 / 6:01 am PST Location: 34° 24.67' N, 118° 24.04' W Magnitude: M W 6.5 Depth: 8.4 km Fault Involved: San Fernando fault zone; minor offset reported on the eastern Santa Susana fault zone Also known as the Sylmar Earthquake, this earthquake occurred â¦ the san fernando earthquake of february 9, 1971. lessons from amoderate earthquake on the fringe of adensely populated region national academy of sciences, washington, dc 1971 u.s. department of commerce national technical information service Mapping of the surface breaks that resulted from the San Fernando earthquake of 9 February 1971 reveals that the pattern of faulting was highly complex; it consisted of a number of segments that produced ground displacements and acceleration throughout the entire northern end of the San Fernando Valley. This earthen dam had partially liquefied and the top 30 feet of the edifice had crumbled. 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. Scary. The San Fernando earthquake (9 February, 1971, M L =6.4, M W =6.6) was initiated at depth (â¼13 km below the surface), north of San Fernando and Sylmar, along a plane dipping 40° to northeast and striking 108°, and with fault area of 130 km 2 The fault broke the ground surface north of the San Fernando airport, â¦ The epicenter of the quake was located in the San Gabriel Mountains, with numerous nearby Los Angeles communities affected. 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. On February 9th, 1971, at approximately 6:00am, the foothills of the San Gabriel Mountains were struck by a 6.7 earthquake. (hra135), Cooperative Institute for Deep Earth Research (CIDER), Northern California Earthquake Data Center (NCEDC), : Destruction in the Eastern Aegean Sea, : An Explosion in Beirut heard all over the Middle East, : Quake in Turkey highlights the hazard in the East Bay. It is evident, however, that more faults in the San Fernando Valley area may be active today than are now recognized. : San Fernando Juvenile Hall, after earthquake, 1971 : Foothill Freeway after earthquake, 1971 : Olive View Medical Center after the 1971 Sylmar quake, before demolition The Symlar San Fernando Valley Earthquake of 1971. "Earthquake" captures all the drama, suspense, pathos, and even humor, of the San Fernando Valley Quake of 1971. Even more surprising was the location of the focus of the quake, which later came to be known as the San Fernando earthquake. Sylmar Earthquake 1971 Hospital Damage. 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. Earthquakes are best described as a shaking or vibration of the ground caused by breaking of rock. Objects under such forces would have been weightless for a few seconds, like astronauts in space. Earthquake - Magnitude 2.5 quake shakes in the San Fernando Valley. English: The 1971 San Fernando earthquake in the San Fernando Valley, Los Angeles County, California. It was the first strong quake to hit the area since the 1893 Pico Canyon quake, with an epicenter several miles west of Sylmar. This is the Olive View Medical Center. 45 years ago - 1971 Sylmar earthquake... Did you experience it? â¢ 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. Mapping of the surface breaks that resulted from the San Fernando earthquake of 9 February 1971 reveals that the pattern of faulting was highly complex; it consisted of a number of â¦ Also known as the Sylmar Earthquake, the magnitude-6.5 quake was reported on a Tuesday at about 6:01 a.m. Its origin was in the foothills of the San Gabriel Mountains north of Los Angeles, but shaking was felt across a widespread part of the San Fernando Valley. Mappingof the surface breaks that resulted from the San Fernando earthquake of 9 February 1971 reveals that the pattern of faulting was highly complex; it consisted of a number of segments that produced ground displace- ments and acceleration throughout the entire northern end of the San Fernando Valley. Browse more videos. Sylmar) earthquake (Mw = 6.6) occurred in the early morning hours of February 9. 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 February 9, 1971, with a magnitude of 6.6. It also occurred on a hitherto unknown fault, albeit a different one from the San Fernando fault (see Figure 2). This is the San Fernando Valley. As the dam might collapse further and then be breached by the enormous pressure of the water behind it, authorities decided to evacuate an area of 10 square miles along the San Diego Freeway. San Fernando Juvenile Hall, after earthquake, 1971 Creator Unknown Date Created and/or Issued 1971-02 2001-08-27 Publication Information California State University, Northridge. Geologists had known for a long time that the San Gabriel Mountains above the San Fernando Valley were riddled with faults. Highways cracked and buckled. It occurred at 6:00:41. 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 February 9, 1971, with a magnitude of 6.6. Jun 21, 2017 - San Fernando Valley earthquake (02-09-1971). The 1971 San Fernando earthquake struck at 6:00:55 a.m. PST on the morning of February 9, 1971. C. R. Allen and his coâworkers assigned the main shock parameters: 34°24.7â²N, 118°24.0â²W, focal depth h = 8.4 km, and local magnitude M L = 6.4. The earthquake was generated by thrust faulting on the Sierra Madre fault. 1971 Pantera Repair Paint Video Daily Motion Channel Simi Valley, California. Playing next. More than 80,000 people living downstream had to leave their homes for four days, while engineers frantically shored up the dam and lowered the water level. 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. Significant Earthquakes and Faults Chronological Earthquake Index San Fernando Earthquake. Such faults, which are unknown but can produce devastating quakes, are called blind thrust faults. San Fernando Valley Natural Disasters Southern California Old Houses Childhood Memories Melbourne Around â¦ Material from 1971 San Fernando earthquake was split to Sierra Madre Fault Zone on 23:28, 19 March 2017 from this version.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. from California Geology, April/May 1971, Vol. 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. Report. Sometimes they are very strong and other times you would hardly notice them. Much like the Northridge Earthquake 23 years later, the quake also tore apart freeway overpasses. Seismologists call it the San Fernando earthquake. 24, No. There are various names for this earthquake. The earthquake that rocked the northern San Fernando Valley, near Sylmar measured magnitude 6.6 on the Richter magnitude scale. 1771 Words 8 Pages. Make social videos in an instant: use custom templates to tell the right story for your business. Once the shaking was over and rescuers started to assess the damage, the imminent fear of a new catastrophe arose: The Van Norman Dam just northwest of the town of San Fernando, where 3.6 billion gallons of drinking water were stored, was severely damaged. In some areas it was offset more than 5 feet. Never before had such a strong acceleration been recorded in an earthquake. During the Northridge earthquake in January 1994, more than 50 people were killed and the quake caused damage worth $35 billion. The February 9, 1971 earthquake in San Fernando Valley, California, caused slides in the embankments of two old adjacent hydraulic fill dams. The Slides in the San Fernando Dams During the Earthquake of February 9, 1971. When seismologists checked their records they were utterly surprised. In comparison, both the Loma Prieta (1989) and Northridge (1994) quakes measured âIX Violentâ on the Mercalli Scale, two steps below this quake (the Sylmar Earthquake, 1971). Most dams are constructed well and they are built for eternity. But it was generally accepted that none of these demarcation lines between two separate geologic units were active, meaning that they had not produced any earthquakes recently. This is the Olive View Medical Center. A magnitude 4.2 earthquake shook Southern California's San Fernando Valley just before 4:30 a.m. on Thursday, the United States Geological Survey said. The red line is the fault on which the Northridge quake occurred in 1994. List of earthquakes in California - Wikipedia The section of freeway in Sylmar, California that was intended to open first (between Interstate 5 and Maclay Avenue) was damaged by the 1971 â¦ found: Wikipedia, Feb. 24, 2006 (The Sylmar earthquake struck at 6:00:55 a.m. PST on the morning of February 9, 1971. More chunks of earth collapsed with each new aftershock, reducing the height of the crown and bringing the water table dangerously close to the top of the dam (see Figure 1). Saved from scvhistory.com The February 9, 1971 earthquake in San Fernando Valley, California, caused slides in the embankments of two old adjacent hydraulic fill dams. Categories: 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. Jul 9, 2013 - 1971 Sylmar Earthquake San Fernando Valley Lived through this quake on Feb. 9! This event included 4 aftershock quakes with magnitudes around 5. Earthquakes are best described as a shaking or vibration of the ground caused by breaking of rock. University Library Contributing Institution California State University, Northridge Collection San Fernando Valley History Rights Information The earthquake that rocked the northern San Fernando Valley, near Sylmar measured magnitude 6.6 on the Richter magnitude scale. How destructive was this quake on February 9, 1971? "Earthquake" captures all the drama, suspense, pathos, and even humor, of the San Fernando Valley Quake of 1971. 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Quake also tore apart freeway overpasses years ago today, 2020 - Explore David 's board `` Sylmar.... Between 70,000 and 120,000 people under the town of Sylmar it seemed from summer 1965 1971!

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