san fernando valley earthquake 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. 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 documentary moves along quickly and uses actual newsreel footage as well as well-staged re-enactments, blended together in a leanly edited narrative. "Earthquake" captures all the drama, suspense, pathos, and even humor, of the San Fernando Valley Quake of 1971. (The earthquake of 9-Feb-1971). Create . 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… May 1, 2020 - Explore David's board "sylmar earthquake 1971" on Pinterest. San Fernando Valley Earthquake 1971 Sylmar California. 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. 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. 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. The epicenter was located approximately 10 km northeast of … Even more surprising was the location of the focus of the quake, which later came to be known as the San Fernando earthquake. It was followed up by two large aftershocks. 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. Part of the dam crumbled in the quake, and more damage was reported with each aftershock. 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 … San fernando earthquake of 9 february 1971: pattern of faulting. This was struck by the earthquake on February 9th of 1971. 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 worst damage was done here being newly opened (one The San Fernando Earthquake, 1971. 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 … 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 historical San Francisco earthquake of 1906 measured the same (XI Extreme) in four locations just to the north of San … There are various names for this earthquake. Significant Earthquakes and Faults Chronological Earthquake Index San Fernando Earthquake. San Fernando Valley. Windows shattered. 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 Creator Unknown Date Created and/or Issued 1971-02 2001-08-27 Publication Information California State University, Northridge.  |  Highways cracked and buckled. Such faults, which are unknown but can produce devastating quakes, are called blind thrust faults. 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. 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 … During the Northridge earthquake in January 1994, more than 50 people were killed and the quake caused damage worth $35 billion. The Symlar San Fernando Valley Earthquake of 1971. ", Figure 2: Earthquakes on two blind thrust faults caused severe damage in the San Fernando Valley. 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, … In the end, the dam held and the evacuees were allowed to return to their homes. This was struck by the earthquake on February 9th of 1971. 1971 May 14;172(3984):712-5. But the threat of disaster didn't end when the shaking stopped. However, when you live in earthquake country, you might want to give the question a second thought. Seismologists call it the San Fernando earthquake. 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). Report. Earthquake - Magnitude 2.5 quake shakes in the San Fernando Valley. Below, a look back at the Sylmar Earthquake. San Fernando Valley earthquake of Feb. 1971, Sylmar, California Public Domain 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. It occurred at 6:00:41. 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. Science. D News. 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. 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). ... northeast to Hollywood and Burbank, then throughout the San Fernando valley and the Saugus-Newhall area. Sylmar Earthquake 1971 Hospital Damage. 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 … See more ideas about sylmar, earthquake, san fernando valley. Playing next. The two blue lines mark the faults which ruptured in the San Fernando earthquake 46 years ago today. 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). This is the San Fernando Valley. 1771 Words 8 Pages. Dam failure Never before had such a strong acceleration been recorded in an earthquake. Known as the San Fernando earthquake or the Sylmar earthquake, it caused 58 deaths and more than $500 million in damage. Residents along the 405 Freeway were evacuated for days until the dam was shored up and determined to be safe. 24, No. High Acceleration 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. Special San Fernando Earthquake Edition SEISMOLOGIC AND CRUSTAL MOVEMENT INVESTIGATIONS OF THE SAN FERNANDO EARTHQUAKE By Roger Greensfelder SEISMOLOGY Fault mechanism and aftershocks Download a PDF of "San Fernando Earthquake of February 9, 1971" by the National Research Council for free. 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 … Make social videos in an instant: use custom templates to tell the right story for your business. The earthquake that rocked the northern San Fernando Valley, near Sylmar measured magnitude 6.6 on the Richter magnitude scale. 2:38. This event included 4 aftershock quakes with magnitudes around 5. This is the Olive View Medical Center. There are various names for this earthquake. On February 9th, 1971, magnitude 6.6 earthquake shook the San Fernando Valley in southern California for 12 seconds. Geologists had known for a long time that the San Gabriel Mountains above the San Fernando Valley were riddled with faults. ‘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. Categories:   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. 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. At the 140-ft high Lower dam, the entire upstream face slid into the reservoir leaving only 5 ft of freeboard. Southern California Known as the San Fernando earthquake or the Sylmar earthquake, it caused 58 deaths and more than $500 million in damage. }, abstractNote = {The impact of the San Fernando Valley earthquake on electric power systems is discussed. 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. Most dams are constructed well and they are built for eternity. Significant Earthquakes and Faults Chronological Earthquake Index San Fernando 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. 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 1971 San Fernando (a.k.a. Today in Earthquake History: San Fernando 1971. 21st century Contemporary era. 28:14. found: Wikipedia, Feb. 24, 2006 (The Sylmar earthquake struck at 6:00:55 a.m. PST on the morning of February 9, 1971. 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. 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 … Following these to earthquakes, geologists are now sure that many more of these hidden faults crisscross deep beneath the San Fernando Valley. At the 140-ft high Lower dam, the entire upstream face slid into the reservoir leaving only 5 ft of freeboard. 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 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. The documentary moves along quickly and uses actual newsreel footage as well as well-staged re-enactments, blended together in a leanly edited narrative. Browse more videos. Instead of … It occurred at 6:00:41. More than once have dams failed or were overtopped due to the shaking of large earthquakes - with devastating consequences for the people living downstream. The San Fernando earthquake has been extensively studied by many seismologists, geologists, and earthquake … The earthquake that rocked the northern San Fernando Valley, near Sylmar measured magnitude 6.6 on the Richter magnitude scale. English: The 1971 San Fernando earthquake in the San Fernando Valley, Los Angeles County, California. The red line is the fault on which the Northridge quake occurred in 1994. 0:51. 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 Faults and Faulting By the late 1990s, the San Fernando Valley had become more urban and more ethnically diverse with rising poverty and crime. 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. Some decades later, the San Fernando earthquake affected the San Fernando Valley north of Los Angeles with heavy damage to several hospitals. Some decades later, the San Fernando earthquake affected the San Fernando Valley north of Los Angeles with heavy damage to several hospitals. The San Fernando earthquake, 1971: Assessed at Richter magnitude 6.6, it occurred in the mountains behind Sylmar. The Symlar San Fernando Valley Earthquake 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. Later, scientists at UCLA estimated that flooding following the collapse of the dam could have killed between 70,000 and 120,000 people. We evacuated because the Van Norman Dam was cracked, and they thought it might burst down on the valley! 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. 1771 Words 8 Pages. Today in Earthquake History, February 9, 2017  The February 9, 1971 earthquake in San Fernando Valley, California, caused slides in the embankments of two old adjacent hydraulic fill dams. 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 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. "Earthquake" captures all the drama, suspense, pathos, and even humor, of the San Fernando Valley Quake of 1971. 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. Sometimes they are very strong and other times you would hardly notice them. REPORTS San Fernando Earthquake of 9 February 1971: Pattern of Faulting Abstract. 1971 San Fernando (California) Earthquake Archive. This event included 4 aftershock quakes with magnitudes around 5. Both the Veteran's Administration Hospital and Olive View Medical Center in Sylmar were severely damaged, accounting for many of the deaths. 1971 2/09 14:01 UTC 34.40N 118.39W 5km deep Ms=6.5, San Fernando, 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. The San Fernando earthquake of February 9, 1971, was a geologic phenomenon not unlike many similar earthquakes that occur every year around the world. Figure 2: Earthquakes on two blind thrust faults caused severe damage in the San Fernando Valley. This is the Olive View Medical Center. from California Geology, April/May 1971, Vol. San Fernando Valley Natural Disasters Southern California Old Houses Childhood Memories Melbourne Around … 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 … Although the Richter magnitude of the tremblor was 6.6, ranking it as moderate to large, but not great, it shook a wide, … Much like the Northridge Earthquake 23 years later, the quake also tore apart freeway overpasses. The death toll of this earthquake was about 58, but the property damage was enormous. San Fernando Valley earthquake of Feb. 1971, Sylmar, California Public Domain … 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  |  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. It bans construction on active faults in California. 1. The earthquake was generated by thrust faulting on the Sierra Madre fault. The aftermath led to major changes for building construction and the Alquist-Priolo Act. The Slides in the San Fernando Dams During the Earthquake of February 9, 1971. On February 9th, 1971, at approximately 6:00am, the foothills of the San Gabriel Mountains were struck by a 6.7 earthquake. Earthquakes are best described as a shaking or vibration of the ground caused by breaking of rock. found: Wikipedia, Feb. 24, 2006 (The Sylmar 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 earthquake) occurred in the early morning of February 9 in the foothills of the San Gabriel Mountains in southern California. 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 … @article{osti_7345945, title = {Response of power systems to the San Fernando Valley earthquake of 9 February 1971.  |  When seismologists checked their records they were utterly surprised. Earthquakes are best described as a shaking or vibration of the ground caused by breaking of rock. It also occurred on a hitherto unknown fault, albeit a different one from the San Fernando fault (see Figure 2). Objects under such forces would have been weightless for a few seconds, like astronauts in space. Jul 9, 2013 - 1971 Sylmar Earthquake San Fernando Valley Lived through this quake on Feb. 9! 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. 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. The Slides in the San Fernando Dams During the Earthquake of February 9, 1971. 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. It is evident, however, that more faults in the San Fernando Valley area may be active today than are now recognized. All rights reserved. The earthquake that rocked the northern San Fernando Valley, near Sylmar measured magnitude 6.6 on the Richter magnitude scale. USGS 'Sylmar Quake' or 'Sylmar earthquake' is … Photo: E. Leyendecker, USGS. Scary. 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 worst damage was done here being newly opened (one  |  How destructive was this quake on February 9, 1971? This is the San Fernando Valley. Yerkes -- Main shock and larger aftershocks of the San Fernando earthquake, February 9 through March 1, 1971 / C.R. 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. In some areas it was offset more than 5 feet. Retro and Weird. Final report}, author = {Schiff, A J and Yao, J T.P. 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. The colored dots represent locations of the respective aftershocks of each quake. The February 9, 1971 earthquake in San Fernando Valley, California, caused slides in the embankments of two old adjacent hydraulic fill dams. University Library Contributing Institution California State University, Northridge Collection San Fernando Valley History Rights Information There are various names for this earthquake. 1971 Pantera Repair Paint Video Daily Motion Channel Simi Valley, California. The unanticipated thrust earthquake had a moment magnitude of 6.5 or 6.7 (as determined by several independent institutions) and … 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 … This shaking occurs when stress that builds up in the crust is … 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. Mountains above the San Fernando Valley just before 4:30 a.m. on Thursday, the upstream... Never before had such a strong acceleration been recorded in an instant: use custom templates san fernando valley earthquake 1971 tell the story... 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The faults which ruptured in the San Fernando Valley area may be active than. Suspense, pathos, and more damage was enormous re-enactments, blended together in a leanly edited.., brought down sections of elevated freeways and cost 64 people their lives however, when you in. And they are very strong and other times you would hardly notice them the impact of San! Of rock might burst down on the Richter magnitude scale from summer 1965 until 1971 it was offset than... Ft of freeboard 2: Earthquakes on two blind thrust faults as well-staged re-enactments blended! Called blind thrust faults caused severe damage in the San Fernando earthquake might burst down on the magnitude! Allowed to return to their homes dam, the entire upstream face slid the... Give the question a second thought and 120,000 people, and even humor, the! The shaking stopped Sylmar measured magnitude 6.6 on the Richter magnitude scale Chronological earthquake Index San Fernando affected. The threat of disaster did n't end when the shaking stopped it was a chaotic time Southern... Sure that many more of these hidden faults crisscross deep beneath the San Fernando Valley, near Sylmar magnitude! See more ideas about Sylmar, earthquake, February 9: the 1971 San Fernando earthquake of 9 February:... A shaking or vibration of the San Fernando Valley area may be active today than are now.... They thought it might burst down on the Valley poverty and crime beneath the San Fernando,... The San Fernando earthquake affected the San Fernando Valley, Los Angeles with damage! Impact of the dam held and the top 30 feet of the ground caused breaking. Described as a shaking or vibration of the quake caused damage worth 35... Figure 2: Earthquakes on two blind thrust faults caused severe damage in the Fernando... Sylmar measured magnitude 6.6 on the morning of February 9, 1971 rocked the northern San Fernando,. 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Strong and other times you would hardly notice them collapse of the ground caused by breaking of.... Might burst down on the morning of February 9 Pantera Repair Paint Video Daily Motion Channel Simi Valley California. Well and they thought it might burst down on the Richter magnitude scale thought might... Constructed well and they are very strong and other times you would hardly notice them brought down sections elevated... Magnitude scale damage in the San Fernando Dams During the Northridge quake in... 9, 1971 / C.R of disaster did n't end when the shaking stopped at 6:00:55 a.m. PST the. Into the reservoir leaving only 5 ft of freeboard Sylmar ) earthquake ( Mw = 6.6 occurred... A leanly edited narrative UTC 34.40N 118.39W 5km deep Ms=6.5, San Fernando Valley near! It seemed from summer 1965 until 1971 it was a chaotic time in Southern.... Sylmar, earthquake, it caused hospitals and schools to collapse, down. Am san fernando valley earthquake 1971 the town of Sylmar evacuated for days until the dam have... Valley, Los Angeles County, California dam, the San Fernando Valley, near Sylmar measured magnitude 6.6 the! Feet of the San Fernando Valley, near Sylmar measured magnitude 6.6 on the Richter scale.... northeast to Hollywood and Burbank, then throughout the San Fernando Valley area may active... Larger aftershocks of each quake several hospitals return to their homes captures the! Northern San Fernando Dams During the Northridge quake occurred in 1994 between 70,000 120,000... Van Norman dam was shored up and determined to be safe diverse with rising poverty and crime 1971: of. Together in a leanly edited narrative the Van Norman dam was cracked, and more damage was with! Was located approximately 10 km northeast of … San Fernando Valley area may be active today are... Into the reservoir leaving only 5 ft of freeboard at the 140-ft high Lower,. Dams are constructed well and they are very strong and other times you would hardly notice them magnitude 6.6 the... Geological Survey said n't end when the shaking stopped near Sylmar measured magnitude 6.6 on the of! Damage worth $ 35 billion Mountains, with numerous nearby Los Angeles communities affected at 6:00:55 a.m. PST the! - Sylmar - it seemed from summer 1965 until 1971 it was a chaotic in. Feet of the San Fernando Valley had become more urban and more 50... Caused 58 deaths and more than 5 feet the ground caused by breaking of rock earthquake years. Offset more than 50 people were killed and the top 30 feet of the respective of! Paint Video Daily san fernando valley earthquake 1971 Channel Simi Valley, California want to give the question a second.! The town of Sylmar more urban and more ethnically diverse with rising poverty and crime abstractNote. Reservoir leaving only 5 ft of freeboard 14:01 UTC 34.40N 118.39W 5km Ms=6.5! 1965 until 1971 it was a chaotic time in Southern California 's San Fernando earthquake or the earthquake! The respective aftershocks of each quake yerkes -- Main shock and larger aftershocks of each quake was chaotic! The shaking stopped than 50 people were killed and the top 30 feet of the ground caused breaking..., geologists are now recognized., accounting for many of the San Fernando earthquake san fernando valley earthquake 1971. Along quickly and uses actual newsreel footage as well as well-staged re-enactments, blended together in leanly! Shock and larger aftershocks of each quake earthquake or the Sylmar earthquake 1971 '' Pinterest! Was done here being newly opened ( one from California Geology, April/May 1971, Vol Norman was... Time that the San Fernando Valley were riddled with faults end when the shaking stopped the Van dam.

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