The earthquake was generated by thrust faulting on the Sierra Madre fault. At the 140-ft high Lower dam, the entire upstream face slid into the reservoir leaving only 5 ft of freeboard. 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. Sylmar Earthquake 1971 Hospital Damage. Known as the San Fernando earthquake or the Sylmar earthquake, it caused 58 deaths and more than $500 million in damage. There are various names for this earthquake. This event included 4 aftershock quakes with magnitudes around 5. 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 … During the Northridge earthquake in January 1994, more than 50 people were killed and the quake caused damage worth $35 billion. Please leave this template in place to link the article … 1771 Words 8 Pages. Saved from scvhistory.com Jul 23, 2015 - SYLMAR - It seemed from summer 1965 until 1971 it was a chaotic time 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 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. 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. May 1, 2020 - Explore David's board "sylmar earthquake 1971" on Pinterest. 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. "Earthquake" captures all the drama, suspense, pathos, and even humor, of the San Fernando Valley Quake of 1971. Playing next. Introduction / Arthur Grantz -- An estimate of the damage / Reuben Kachadoorian -- Geologic setting and activity of faults in the San Fernando area, California / Carl M. Wentworth and R.F. 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. It is evident, however, that more faults in the San Fernando Valley area may be active today than are now recognized." … 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). San Fernando Valley. : San Fernando Juvenile Hall, after earthquake, 1971 : Foothill Freeway after earthquake, 1971 : Olive View Medical Center after the 1971 Sylmar quake, before demolition Jul 9, 2013 - 1971 Sylmar Earthquake San Fernando Valley Lived through this quake on Feb. 9! Southern California Much like the Northridge Earthquake 23 years later, the quake also tore apart freeway overpasses. 0:51. 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 How destructive was this quake on February 9, 1971? ", Figure 2: Earthquakes on two blind thrust faults caused severe damage in the San Fernando Valley. In comparison, both the Loma Prieta (1989) and Northridge (1994) quakes measured “IX Violent” on the Mercalli Scale, two steps below this quake (the Sylmar Earthquake, 1971). 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 … Instead of … Make social videos in an instant: use custom templates to tell the right story for your business. 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. English: The 1971 San Fernando earthquake in the San Fernando Valley, Los Angeles County, California. Never before had such a strong acceleration been recorded in an earthquake. Categories:   Dam failure The San Fernando earthquake of February 9, 1971, was a geologic phenomenon not unlike many similar earthquakes that occur every year around the world. Known as the San Fernando earthquake or the Sylmar earthquake, it caused 58 deaths and more than $500 million in damage. 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. 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 … Create . The February 9, 1971 earthquake in San Fernando Valley, California, caused slides in the embankments of two old adjacent hydraulic fill dams. 21st century Contemporary era. There are various names for this earthquake. The Slides in the San Fernando Dams During the Earthquake of February 9, 1971. 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. Earthquake Faults and Faulting The worst damage was done here being newly opened (one Preparedness, Risks, and Hazards This was struck by the earthquake on February 9th of 1971. The 1971 San Fernando earthquake, also known as the “Sylmar Quake,” took place on the morning of February 9, 1971 around 6:01am. USGS 'Sylmar Quake' or 'Sylmar earthquake' is … Retro and Weird. 24, No. See more ideas about sylmar, earthquake, san fernando valley. This is the Olive View Medical Center. • 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. This shaking occurs when stress that builds up in the crust is … The San Fernando earthquake (9 February, 1971, M L =6.4, M W =6.6) was initiated at depth (∼13 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, …  |  It bans construction on active faults in 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. The Symlar San Fernando Valley Earthquake of 1971. Some decades later, the San Fernando earthquake affected the San Fernando Valley north of Los Angeles with heavy damage to several hospitals. It also occurred on a hitherto unknown fault, albeit a different one from the San Fernando fault (see Figure 2). 1971 San Fernando (California) Earthquake Archive.  |  Such faults, which are unknown but can produce devastating quakes, are called blind thrust faults. In some areas of the epicentral region the ground had shaken so violently that seismic sensors recorded accelerations of more than 1.25 g, where g is the standard gravitational acceleration at the Earth's surface. On February 9th, 1971, magnitude 6.6 earthquake shook the San Fernando Valley in southern California for 12 seconds. The 1971 San Fernando (a.k.a.  |  Below, a look back at the Sylmar Earthquake. found: Wikipedia, Feb. 24, 2006 (The Sylmar earthquake struck at 6:00:55 a.m. PST on the morning of February 9, 1971. Sometimes they are very strong and other times you would hardly notice them. 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… 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. Significant Earthquakes and Faults Chronological Earthquake Index San Fernando Earthquake. Photo: E. Leyendecker, USGS. Earthquakes are best described as a shaking or vibration of the ground caused by breaking of rock. 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 … San Fernando Valley earthquake of Feb. 1971, Sylmar, California Public Domain Jun 21, 2017 - San Fernando Valley earthquake (02-09-1971). There are various names for this earthquake. 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. This event included 4 aftershock quakes with magnitudes around 5. Most dams are constructed well and they are built for eternity. Final report}, author = {Schiff, A J and Yao, J T.P. The unanticipated thrust earthquake had a moment magnitude of 6.5 or 6.7 (as determined by several independent institutions) and … (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. This earthen dam had partially liquefied and the top 30 feet of the edifice had crumbled. Report. 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 was followed up by two large aftershocks. This paper compares the distribution of damage from the San Fernando, 1971, and Northridge, 1994, earthquakes. 2:38. San fernando earthquake of 9 february 1971: pattern of faulting. Part of the dam crumbled in the quake, and more damage was reported with each aftershock. 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. The earthquake that rocked the northern San Fernando Valley, near Sylmar measured magnitude 6.6 on the Richter magnitude scale. There was fear of an imminent collapse of the Van Norman Dam, which held more than 3.5 billion gallons of water just northwest of San Fernando. The Slides in the San Fernando Dams During the Earthquake of February 9, 1971. We evacuated because the Van Norman Dam was cracked, and they thought it might burst down on the valley! ‘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. 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. 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. }, abstractNote = {The impact of the San Fernando Valley earthquake on electric power systems is discussed. The worst damage was done here being newly opened (one Figure 2: Earthquakes on two blind thrust faults caused severe damage in the San Fernando Valley. It caused hospitals and schools to collapse, brought down sections of elevated freeways and cost 64 people their lives. By the late 1990s, the San Fernando Valley had become more urban and more ethnically diverse with rising poverty and crime. 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 aftermath led to major changes for building construction and the Alquist-Priolo Act. Residents along the 405 Freeway were evacuated for days until the dam was shored up and determined to be safe. The red line is the fault on which the Northridge quake occurred in 1994. 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. ... northeast to Hollywood and Burbank, then throughout the San Fernando valley and the Saugus-Newhall area. PACOIMA (CBSLA) — A 4.2-magnitude earthquake struck the Pacoima area of the San Fernando Valley early Thursday morning and was felt across the Southland. 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. Palmer DF, Henyey TL. "Earthquake" captures all the drama, suspense, pathos, and even humor, of the San Fernando Valley Quake of 1971. Both the Veteran's Administration Hospital and Olive View Medical Center in Sylmar were severely damaged, accounting for many of the deaths. However, when you live in earthquake country, you might want to give the question a second thought. The epicenter was located approximately 10 km northeast of … The documentary moves along quickly and uses actual newsreel footage as well as well-staged re-enactments, blended together in a leanly edited narrative. High Acceleration The Symlar San Fernando Valley Earthquake of 1971. Science. 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. The San Fernando Earthquake, 1971. There are various names for this earthquake. D News.  |  Objects under such forces would have been weightless for a few seconds, like astronauts in space. Browse more videos. Blind Thrust The 1971 San Fernando Earthquake, by Bob Burnside "County Recurrent" is pleased to present another story from Chief Bob Burnside, Ret., this time with respect to the Sylmar Earthquake that struck early in the morning on Feb. 9, 1971, and resulted in one of the earliest multi-lifeguard agency swift water response that we know of in … 1971 Pantera Repair Paint Video Daily Motion Channel Simi Valley, California. 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. from California Geology, April/May 1971, Vol. Windows shattered. The quake took place at 6 am under the town of Sylmar. Today in Earthquake History: San Fernando 1971. 1971 May 14;172(3984):712-5. 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. 1. Later, scientists at UCLA estimated that flooding following the collapse of the dam could have killed between 70,000 and 120,000 people. Some decades later, the San Fernando earthquake affected the San Fernando Valley north of Los Angeles with heavy damage to several hospitals. 28:14. When seismologists checked their records they were utterly surprised. There were the Watts Riots, the assassination of Robert F. Kennedy at The Ambassador Hotel, Charles Manson, the Chicano Moratorium in East Los Angeles, the ongoing destruction of the original Bunker Hill, the Sunset … There are various names for this earthquake.  |  (The earthquake of 9-Feb-1971). found: Wikipedia, Feb. 24, 2006 (The Sylmar earthquake struck at 6:00:55 a.m. PST on the morning of February 9, 1971. Following these to earthquakes, geologists are now sure that many more of these hidden faults crisscross deep beneath the San Fernando Valley. 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. This is the San Fernando Valley. Geologists had known for a long time that the San Gabriel Mountains above the San Fernando Valley were riddled with faults. San Fernando has had: (M1.5 or greater) 0 earthquakes in the past 24 hours 1 earthquake in the past 7 days; 21 earthquakes in the past 30 days; 320 earthquakes in the past 365 days 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. At the time, the 1971 San Fernando earthquake was the most destructive event to affect greater Los Angeles since the magnitude-6.3 Long Beach earthquake of 1933. Even more surprising was the location of the focus of the quake, which later came to be known as the San Fernando earthquake. Sometimes they are very strong and other times you would hardly notice them. It occurred at 6:00:41. The colored dots represent locations of the respective aftershocks of each quake. Significant Earthquakes and Faults Chronological Earthquake Index San Fernando Earthquake. Scary. Highways cracked and buckled. The death toll of this earthquake was about 58, but the property damage was enormous. Situated at the boundary to the San Gabriel Valley and San Fernando Valley, the Sierra Madre Fault Zone (also known as the Sierra Madre-Cucamonga Fault) runs along the southern edge of the San … In some areas it was offset more than 5 feet. Yerkes -- Main shock and larger aftershocks of the San Fernando earthquake, February 9 through March 1, 1971 / C.R. The San Fernando earthquake, 1971: Assessed at Richter magnitude 6.6, it occurred in the mountains behind Sylmar. This was struck by the earthquake on February 9th of 1971. San Fernando Valley earthquake of Feb. 1971, Sylmar, California Public Domain 1771 Words 8 Pages. The February 9, 1971 earthquake in San Fernando Valley, California, caused slides in the embankments of two old adjacent hydraulic fill dams. Seismologists call it the San Fernando earthquake. 4-5. This is the Olive View Medical Center. The San Fernando earthquake has been extensively studied by many seismologists, geologists, and earthquake … 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 … Although the Richter magnitude of the tremblor was 6.6, ranking it as moderate to large, but not great, it shook a wide, … But the threat of disaster didn't end when the shaking stopped. 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 Valley near Sylmar at 6:00:55 a.m. PST on February 9 1971 … 45 years ago - 1971 Sylmar earthquake... Did you experience it? The epicenter of the quake was located in the San Gabriel Mountains, with numerous nearby Los Angeles communities affected. It was the first strong quake to hit the area since the 1893 Pico Canyon quake, with an epicenter several miles west of Sylmar. In comparison, both the Loma Prieta (1989) and Northridge (1994) quakes measured “IX Violent” on the Mercalli Scale, two steps below this quake (the Sylmar Earthquake, 1971). 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. The 1971 San Fernando earthquake (magnitude 6.7) collapsed four buildings at the San Fernando Veterans Administration Hospital complex (above), killing 47 people Damage from the San Fernando Earthquake, in the San Fernando Valley, Southern California. 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. It occurred at 6:00:41. Earthquake - Magnitude 2.5 quake shakes in the San Fernando Valley. The historical San Francisco earthquake of 1906 measured the same (XI Extreme) in four locations just to the north of San … This is the San Fernando Valley. 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. 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. 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. @article{osti_7345945, title = {Response of power systems to the San Fernando Valley earthquake of 9 February 1971. Within the southern California region alone, the historic record suggests that an earthquake of about this magnitude occurs on the average of once every four years ( Fig. It is evident, however, that more faults in the San Fernando Valley area may be active today than are now recognized. 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. Earthquakes are best described as a shaking or vibration of the ground caused by breaking of rock. 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. Today in Earthquake History, February 9, 2017  San Fernando Valley Earthquake 1971 Sylmar California. Seismologists call it the San Fernando earthquake. On February 9th, 1971, at approximately 6:00am, the foothills of the San Gabriel Mountains were struck by a 6.7 earthquake. 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 … 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. In the end, the dam held and the evacuees were allowed to return to their homes. All rights reserved. More than once have dams failed or were overtopped due to the shaking of large earthquakes - with devastating consequences for the people living downstream. 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 … REPORTS San Fernando Earthquake of 9 February 1971: Pattern of Faulting Abstract. San Fernando Valley Natural Disasters Southern California Old Houses Childhood Memories Melbourne Around … The two blue lines mark the faults which ruptured in the San Fernando earthquake 46 years ago today. The 1971 San Fernando earthquake struck at 6:00:55 a.m. PST on the morning of February 9, 1971. The earthquake that rocked the northern San Fernando Valley, near Sylmar measured magnitude 6.6 on the Richter magnitude scale. The earthquake that rocked the northern San Fernando Valley, near Sylmar measured magnitude 6.6 on the Richter magnitude scale. Sylmar) earthquake (Mw = 6.6) occurred in the early morning hours of February 9. 1971 2/09 14:01 UTC 34.40N 118.39W 5km deep Ms=6.5, San Fernando, 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. 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