This paper compares the distribution of damage from the San Fernando, 1971, and Northridge, 1994, earthquakes. 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 ⦠... northeast to Hollywood and Burbank, then throughout the San Fernando valley and the Saugus-Newhall area. 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. 1971 2/09 14:01 UTC 34.40N 118.39W 5km deep Ms=6.5, San Fernando, California. All rights reserved. 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. San fernando earthquake of 9 february 1971: pattern of faulting. ⢠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. The worst damage was done here being newly opened (one The documentary moves along quickly and uses actual newsreel footage as well as well-staged re-enactments, blended together in a leanly edited narrative. Saved from scvhistory.com When seismologists checked their records they were utterly surprised. Objects under such forces would have been weightless for a few seconds, like astronauts in space. Dam failure Such faults, which are unknown but can produce devastating quakes, are called blind thrust faults. 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. 1771 Words 8 Pages. English: The 1971 San Fernando earthquake in the San Fernando Valley, Los Angeles County, California. 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). 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. Palmer DF, Henyey TL. : San Fernando Juvenile Hall, after earthquake, 1971 : Foothill Freeway after earthquake, 1971 : Olive View Medical Center after the 1971 Sylmar quake, before demolition It occurred at 6:00:41. Earthquake Faults and Faulting from California Geology, April/May 1971, Vol. The Symlar San Fernando Valley Earthquake of 1971. Never before had such a strong acceleration been recorded in an earthquake. There are various names for this earthquake. 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 ⦠The Symlar San Fernando Valley Earthquake of 1971. The earthquake that rocked the northern San Fernando Valley, near Sylmar measured magnitude 6.6 on the Richter magnitude scale. Even more surprising was the location of the focus of the quake, which later came to be known as the San Fernando earthquake. 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. Browse more videos. The 1971 San Fernando (a.k.a. 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 red line is the fault on which the Northridge quake occurred in 1994. The unanticipated thrust earthquake had a moment magnitude of 6.5 or 6.7 (as determined by several independent institutions) and ⦠Known as the San Fernando earthquake or the Sylmar earthquake, it caused 58 deaths and more than $500 million in damage. Significant Earthquakes and Faults Chronological Earthquake Index San Fernando Earthquake. There are various names for this earthquake. Sometimes they are very strong and other times you would hardly notice them. 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. | Known as the San Fernando earthquake or the Sylmar earthquake, it caused 58 deaths and more than $500 million in damage. 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. This was struck by the earthquake on February 9th of 1971. It caused hospitals and schools to collapse, brought down sections of elevated freeways and cost 64 people their lives. 24, No. found: Wikipedia, Feb. 24, 2006 (The Sylmar earthquake struck at 6:00:55 a.m. PST on the morning of February 9, 1971. More than once have dams failed or were overtopped due to the shaking of large earthquakes - with devastating consequences for the people living downstream. 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. 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 ⦠This is the San Fernando Valley. The San Fernando Earthquake, 1971. Jul 9, 2013 - 1971 Sylmar Earthquake San Fernando Valley Lived through this quake on Feb. 9! 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. 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. 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. (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. ", Figure 2: Earthquakes on two blind thrust faults caused severe damage in the San Fernando Valley. | Report. May 1, 2020 - Explore David's board "sylmar earthquake 1971" on Pinterest. Preparedness, Risks, and Hazards 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. How destructive was this quake on February 9, 1971? San Fernando Valley earthquake of Feb. 1971, Sylmar, California Public Domain Yerkes -- Main shock and larger aftershocks of the San Fernando earthquake, February 9 through March 1, 1971 / C.R. | "Earthquake" captures all the drama, suspense, pathos, and even humor, of the San Fernando Valley Quake of 1971. High Acceleration 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 - Magnitude 2.5 quake shakes in the San Fernando Valley. Blind Thrust Most dams are constructed well and they are built for eternity. On February 9th, 1971, at approximately 6:00am, the foothills of the San Gabriel Mountains were struck by a 6.7 earthquake. Jun 21, 2017 - San Fernando Valley earthquake (02-09-1971). Jul 23, 2015 - SYLMAR - It seemed from summer 1965 until 1971 it was a chaotic time in Southern California. 2:38. | Sylmar) earthquake (Mw = 6.6) occurred in the early morning hours of February 9. During the Northridge earthquake in January 1994, more than 50 people were killed and the quake caused damage worth $35 billion. 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 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⦠Highways cracked and buckled. Later, scientists at UCLA estimated that flooding following the collapse of the dam could have killed between 70,000 and 120,000 people. San Fernando Valley Natural Disasters Southern California Old Houses Childhood Memories Melbourne Around ⦠Instead of ⦠Some decades later, the San Fernando earthquake affected the San Fernando Valley north of Los Angeles with heavy damage to several hospitals. 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 earthquake struck at 6:00:55 a.m. PST on the morning of February 9, 1971. Download a PDF of "San Fernando Earthquake of February 9, 1971" by the National Research Council for free. "Earthquake" captures all the drama, suspense, pathos, and even humor, of the San Fernando Valley Quake of 1971. This was struck by the earthquake on February 9th of 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. | @article{osti_7345945, title = {Response of power systems to the San Fernando Valley earthquake of 9 February 1971. There are various names for this earthquake. The two blue lines mark the faults which ruptured in the San Fernando earthquake 46 years ago today. The death toll of this earthquake was about 58, but the property damage was enormous. It is evident, however, that more faults in the San Fernando Valley area may be active today than are now recognized. 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. It caused 58 deaths and more ethnically diverse with rising poverty and crime killed and the evacuees were allowed return... Long time that the San Fernando Valley area may be active today are! 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