san fernando valley earthquake 1971

Some decades later, the San Fernando earthquake affected the San Fernando Valley north of Los Angeles with heavy damage to several hospitals. Objects under such forces would have been weightless for a few seconds, like astronauts in space. The documentary moves along quickly and uses actual newsreel footage as well as well-staged re-enactments, blended together in a leanly edited narrative. This event included 4 aftershock quakes with magnitudes around 5. 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, … 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. Seismologists call it the San Fernando earthquake. Download a PDF of "San Fernando Earthquake of February 9, 1971" by the National Research Council for free. More than once have dams failed or were overtopped due to the shaking of large earthquakes - with devastating consequences for the people living downstream. 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 … The earthquake that rocked the northern San Fernando Valley, near Sylmar measured magnitude 6.6 on the Richter magnitude scale. Windows shattered. 28:14. 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 … We evacuated because the Van Norman Dam was cracked, and they thought it might burst down on the valley! Southern California 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. 45 years ago - 1971 Sylmar earthquake... Did you experience it? The aftermath led to major changes for building construction and the Alquist-Priolo Act. There are various names for this earthquake. 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. Most dams are constructed well and they are built for eternity. 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 … There are various names for this earthquake. 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. Please leave this template in place to link the article … In the end, the dam held and the evacuees were allowed to return to their homes. The San Fernando earthquake, 1971: Assessed at Richter magnitude 6.6, it occurred in the mountains behind Sylmar. 1971 May 14;172(3984):712-5. 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. from California Geology, April/May 1971, Vol. Report. ... northeast to Hollywood and Burbank, then throughout the San Fernando valley and the Saugus-Newhall area. 24, No. 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. At the 140-ft high Lower dam, the entire upstream face slid into the reservoir leaving only 5 ft of freeboard. 1971 San Fernando (California) Earthquake Archive. Special San Fernando Earthquake Edition SEISMOLOGIC AND CRUSTAL MOVEMENT INVESTIGATIONS OF THE SAN FERNANDO EARTHQUAKE By Roger Greensfelder SEISMOLOGY Fault mechanism and aftershocks }, abstractNote = {The impact of the San Fernando Valley earthquake on electric power systems is discussed. : San Fernando Juvenile Hall, after earthquake, 1971 : Foothill Freeway after earthquake, 1971 : Olive View Medical Center after the 1971 Sylmar quake, before demolition Significant Earthquakes and Faults Chronological Earthquake Index San Fernando Earthquake. Scary. The unanticipated thrust earthquake had a moment magnitude of 6.5 or 6.7 (as determined by several independent institutions) and … How destructive was this quake on February 9, 1971? Final report}, author = {Schiff, A J and Yao, J T.P. 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. There are various names for this earthquake. There are various names for this earthquake. Later, scientists at UCLA estimated that flooding following the collapse of the dam could have killed between 70,000 and 120,000 people. The Slides in the San Fernando Dams During the Earthquake of February 9, 1971. The documentary moves along quickly and uses actual newsreel footage as well as well-staged re-enactments, blended together in a leanly edited narrative. Known as the San Fernando earthquake or the Sylmar earthquake, it caused 58 deaths and more than $500 million in damage. 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 Make social videos in an instant: use custom templates to tell the right story for your business. 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. The 1971 San Fernando earthquake struck at 6:00:55 a.m. PST on the morning of February 9, 1971. The 1971 San Fernando earthquake, also known as the “Sylmar Quake,” took place on the morning of February 9, 1971 around 6:01am. In some areas it was offset more than 5 feet. Part of the dam crumbled in the quake, and more damage was reported with each aftershock. Playing next. Today in Earthquake History, February 9, 2017   |  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. "Earthquake" captures all the drama, suspense, pathos, and even humor, of the San Fernando Valley Quake of 1971. 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. "Earthquake" captures all the drama, suspense, pathos, and even humor, of the San Fernando Valley Quake of 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 … San fernando earthquake of 9 february 1971: pattern of faulting. 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. The red line is the fault on which the Northridge quake occurred in 1994. The epicenter of the quake was located in the San Gabriel Mountains, with numerous nearby Los Angeles communities affected. 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. D News. The earthquake that rocked the northern San Fernando Valley, near Sylmar measured magnitude 6.6 on the Richter magnitude scale. High Acceleration This was struck by the earthquake on February 9th of 1971. Jul 9, 2013 - 1971 Sylmar Earthquake San Fernando Valley Lived through this quake on Feb. 9! 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 … On February 9th, 1971, at approximately 6:00am, the foothills of the San Gabriel Mountains were struck by a 6.7 earthquake. Figure 2: Earthquakes on two blind thrust faults caused severe damage in the San Fernando Valley. The February 9, 1971 earthquake in San Fernando Valley, California, caused slides in the embankments of two old adjacent hydraulic fill dams. The quake took place at 6 am under the town of Sylmar. 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. (The earthquake of 9-Feb-1971). It bans construction on active faults in California. The February 9, 1971 earthquake in San Fernando Valley, California, caused slides in the embankments of two old adjacent hydraulic fill dams. (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. 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. 1771 Words 8 Pages. The red line is the fault on which the Northridge quake occurred in 1994. It caused hospitals and schools to collapse, brought down sections of elevated freeways and cost 64 people their lives. Palmer DF, Henyey TL. 2:38. This is the Olive View Medical Center. 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. University Library Contributing Institution California State University, Northridge Collection San Fernando Valley History Rights Information This is the San Fernando Valley.  |  Sylmar) earthquake (Mw = 6.6) occurred in the early morning hours of February 9. 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.  |  Earthquakes are best described as a shaking or vibration of the ground caused by breaking of rock. 4-5. 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. At the 140-ft high Lower dam, the entire upstream face slid into the reservoir leaving only 5 ft of freeboard. English: The 1971 San Fernando earthquake in the San Fernando Valley, Los Angeles County, California. 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 … 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. Even more surprising was the location of the focus of the quake, which later came to be known as the San Fernando earthquake. Earthquake - Magnitude 2.5 quake shakes in the San Fernando Valley. 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. Yerkes -- Main shock and larger aftershocks of the San Fernando earthquake, February 9 through March 1, 1971 / C.R. 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 worst damage was done here being newly opened (one Blind Thrust REPORTS San Fernando Earthquake of 9 February 1971: Pattern of Faulting Abstract. 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). San Fernando Valley earthquake of Feb. 1971, Sylmar, California Public Domain The earthquake that rocked the northern San Fernando Valley, near Sylmar measured magnitude 6.6 on the Richter magnitude scale. The 1971 San Fernando (a.k.a. This event included 4 aftershock quakes with magnitudes around 5. • 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. Both the Veteran's Administration Hospital and Olive View Medical Center in Sylmar were severely damaged, accounting for many of the deaths. The San Fernando Earthquake, 1971. 1971 2/09 14:01 UTC 34.40N 118.39W 5km deep Ms=6.5, San Fernando, California. The San Fernando earthquake of February 9, 1971, was a geologic phenomenon not unlike many similar earthquakes that occur every year around the world. The worst damage was done here being newly opened (one Highways cracked and buckled. 21st century Contemporary era. 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. San Fernando Valley earthquake of Feb. 1971, Sylmar, California Public Domain Preparedness, Risks, and Hazards 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. 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 … … May 1, 2020 - Explore David's board "sylmar earthquake 1971" on Pinterest. 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. This is the San Fernando Valley. This shaking occurs when stress that builds up in the crust is … Categories:   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. It occurred at 6:00:41. It was followed up by two large aftershocks. Following these to earthquakes, geologists are now sure that many more of these hidden faults crisscross deep beneath the San Fernando Valley. This is the Olive View Medical Center. 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. Seismologists call it the San Fernando earthquake. Sometimes they are very strong and other times you would hardly notice them. Such faults, which are unknown but can produce devastating quakes, are called blind thrust faults. The two blue lines mark the faults which ruptured in the San Fernando earthquake 46 years ago today. 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. Geologists had known for a long time that the San Gabriel Mountains above the San Fernando Valley were riddled with faults. 500 million in damage reported with each aftershock Northridge quake occurred in 1994 focus the... From scvhistory.com the 1971 San Fernando earthquake in January 1994, more than $ million! The two blue lines mark the faults which ruptured in the San Fernando fault ( Figure! Deaths and more damage was done here being newly opened ( one from San. Evident, however, that more faults in the San Fernando, California chaotic time in California... 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Ago today the United States Geological Survey said 2 ) live in earthquake country, you want! Was struck by the earthquake that rocked the northern San Fernando Valley 5...., San Fernando Valley earthquake on electric power systems is discussed dam was up... And uses actual newsreel footage as well as well-staged re-enactments, blended together a. { Schiff, a J and Yao, J T.P when seismologists checked their they! Are built for eternity Mw = 6.6 ) occurred in the San Fernando Valley, near measured!

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