san fernando valley earthquake 1971

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. 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. The Slides in the San Fernando Dams During the Earthquake of February 9, 1971. This event included 4 aftershock quakes with magnitudes around 5. This shaking occurs when stress that builds up in the crust is â¦ 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. Earthquake Faults and Faulting 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 â¦ 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¦ At the 140-ft high Lower dam, the entire upstream face slid into the reservoir leaving only 5 ft of freeboard. The February 9, 1971 earthquake in San Fernando Valley, California, caused slides in the embankments of two old adjacent hydraulic fill dams. Some decades later, the San Fernando earthquake affected the San Fernando Valley north of Los Angeles with heavy damage to several hospitals. Jun 21, 2017 - San Fernando Valley earthquake (02-09-1971). Scary. At the 140-ft high Lower dam, the entire upstream face slid into the reservoir leaving only 5 ft of freeboard. Known as the San Fernando earthquake or the Sylmar earthquake, it caused 58 deaths and more than $500 million in damage. | High Acceleration 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 â¦ The 1971 San Fernando (a.k.a. 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. Jul 9, 2013 - 1971 Sylmar Earthquake San Fernando Valley Lived through this quake on Feb. 9! Today in Earthquake History, February 9, 2017 Blind Thrust 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. 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 San Fernando Earthquake, 1971. 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 earthquake of 9-Feb-1971). This is the Olive View Medical Center. The quake took place at 6 am under the town of Sylmar. It also occurred on a hitherto unknown fault, albeit a different one from the San Fernando fault (see Figure 2). Both the Veteran's Administration Hospital and Olive View Medical Center in Sylmar were severely damaged, accounting for many of the deaths. This is the Olive View Medical Center. When seismologists checked their records they were utterly surprised. Part of the dam crumbled in the quake, and more damage was reported with each aftershock. 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 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 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. Earthquakes are best described as a shaking or vibration of the ground caused by breaking of rock. It is evident, however, that more faults in the San Fernando Valley area may be active today than are now recognized." 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 red line is the fault on which the Northridge quake occurred in 1994. Southern California It occurred at 6:00:41. @article{osti_7345945, title = {Response of power systems to the San Fernando Valley earthquake of 9 February 1971. 28:14. 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. 0:51. Although the Richter magnitude of the tremblor was 6.6, ranking it as moderate to large, but not great, it shook a wide, â¦ Jul 23, 2015 - SYLMAR - It seemed from summer 1965 until 1971 it was a chaotic time in Southern California. The earthquake that rocked the northern San Fernando Valley, near Sylmar measured magnitude 6.6 on the Richter magnitude scale. The worst damage was done here being newly opened (one Such faults, which are unknown but can produce devastating quakes, are called blind thrust faults. 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. It is evident, however, that more faults in the San Fernando Valley area may be active today than are now recognized. 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. 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. Palmer DF, Henyey TL. In the end, the dam held and the evacuees were allowed to return to their homes. 21st century Contemporary era. Figure 2: Earthquakes on two blind thrust faults caused severe damage in the San Fernando Valley. 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 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 The San Fernando earthquake of February 9, 1971, was a geologic phenomenon not unlike many similar earthquakes that occur every year around the world. Objects under such forces would have been weightless for a few seconds, like astronauts in space. 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 1. Highways cracked and buckled. 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. Browse more videos. Geologists had known for a long time that the San Gabriel Mountains above the San Fernando Valley were riddled with faults. It occurred at 6:00:41. 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 caused hospitals and schools to collapse, brought down sections of elevated freeways and cost 64 people their lives. The 1971 San Fernando earthquake, also known as the âSylmar Quake,â took place on the morning of February 9, 1971 around 6:01am. Preparedness, Risks, and Hazards 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. The colored dots represent locations of the respective aftershocks of each quake. San Fernando Valley. "Earthquake" captures all the drama, suspense, pathos, and even humor, of the San Fernando Valley Quake of 1971. USGS 'Sylmar Quake' or 'Sylmar earthquake' is â¦ D News. This was struck by the earthquake on February 9th of 1971. English: The 1971 San Fernando earthquake in the San Fernando Valley, Los Angeles County, California. Report. 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. More than once have dams failed or were overtopped due to the shaking of large earthquakes - with devastating consequences for the people living downstream. Never before had such a strong acceleration been recorded in an earthquake. University Library Contributing Institution California State University, Northridge Collection San Fernando Valley History Rights Information 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 has been extensively studied by many seismologists, geologists, and earthquake â¦ The 1971 San Fernando earthquake struck at 6:00:55 a.m. PST on the morning of February 9, 1971. This event included 4 aftershock quakes with magnitudes around 5. This was struck by the earthquake on February 9th of 1971. â¦ Much like the Northridge Earthquake 23 years later, the quake also tore apart freeway overpasses. There are various names for this earthquake. The historical San Francisco earthquake of 1906 measured the same (XI Extreme) in four locations just to the north of San â¦ Below, a look back at the Sylmar Earthquake. San Fernando Valley Earthquake 1971 Sylmar California. But the threat of disaster didn't end when the shaking stopped. Today in Earthquake History: San Fernando 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 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. The Symlar San Fernando Valley Earthquake of 1971. found: Wikipedia, Feb. 24, 2006 (The Sylmar earthquake struck at 6:00:55 a.m. PST on the morning of February 9, 1971. See more ideas about sylmar, earthquake, san fernando valley. | The Symlar San Fernando Valley Earthquake of 1971. Sometimes they are very strong and other times you would hardly notice them. 1971 San Fernando (California) Earthquake Archive. Seismologists call it the San Fernando earthquake. Residents along the 405 Freeway were evacuated for days until the dam was shored up and determined to be safe. REPORTS San Fernando Earthquake of 9 February 1971: Pattern of Faulting Abstract. How destructive was this quake on February 9, 1971? Earthquakes are best described as a shaking or vibration of the ground caused by breaking of rock. Create . Download a PDF of "San Fernando Earthquake of February 9, 1971" by the National Research Council for free. 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. On February 9th, 1971, magnitude 6.6 earthquake shook the San Fernando Valley in southern California for 12 seconds. Most dams are constructed well and they are built for eternity. 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 Natural Disasters Southern California Old Houses Childhood Memories Melbourne Around â¦ The San Fernando earthquake, 1971: Assessed at Richter magnitude 6.6, it occurred in the mountains behind Sylmar. Make social videos in an instant: use custom templates to tell the right story for your business. Earthquake - Magnitude 2.5 quake shakes in the San Fernando Valley. Significant Earthquakes and Faults Chronological Earthquake Index San Fernando Earthquake. The death toll of this earthquake was about 58, but the property damage was enormous. 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). | May 1, 2020 - Explore David's board "sylmar earthquake 1971" on Pinterest. Special San Fernando Earthquake Edition SEISMOLOGIC AND CRUSTAL MOVEMENT INVESTIGATIONS OF THE SAN FERNANDO EARTHQUAKE By Roger Greensfelder SEISMOLOGY Fault mechanism and aftershocks The earthquake that rocked the northern San Fernando Valley, near Sylmar measured magnitude 6.6 on the Richter magnitude scale. Yerkes -- Main shock and larger aftershocks of the San Fernando earthquake, February 9 through March 1, 1971 / C.R. The worst damage was done here being newly opened (one Please leave this template in place to link the article â¦ Playing next. 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. All rights reserved. ", Figure 2: Earthquakes on two blind thrust faults caused severe damage in the San Fernando Valley. 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. Retro and Weird. 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. }, abstractNote = {The impact of the San Fernando Valley earthquake on electric power systems is discussed. 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. The two blue lines mark the faults which ruptured in the San Fernando earthquake 46 years ago today. 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. : San Fernando Juvenile Hall, after earthquake, 1971 : Foothill Freeway after earthquake, 1971 : Olive View Medical Center after the 1971 Sylmar quake, before demolition The documentary moves along quickly and uses actual newsreel footage as well as well-staged re-enactments, blended together in a leanly edited narrative. 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. 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