The worst damage was done here being newly opened (one It occurred at 6:00:41. from California Geology, April/May 1971, Vol. 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 … Some decades later, the San Fernando earthquake affected the San Fernando Valley north of Los Angeles with heavy damage to several hospitals. On February 9th, 1971, magnitude 6.6 earthquake shook the San Fernando Valley in southern California for 12 seconds. 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. Known as the San Fernando earthquake or the Sylmar earthquake, it caused 58 deaths and more than $500 million in damage. 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 … At the 140-ft high Lower dam, the entire upstream face slid into the reservoir leaving only 5 ft of freeboard. 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. This is the Olive View Medical Center. However, when you live in earthquake country, you might want to give the question a second thought. Below, a look back at the Sylmar Earthquake. There are various names for this earthquake. High Acceleration Science. 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. This is the San Fernando Valley. This is the Olive View Medical Center. Southern California @article{osti_7345945, title = {Response of power systems to the San Fernando Valley earthquake of 9 February 1971. Report. (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. 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 San Fernando Valley earthquake of Feb. 1971, Sylmar, California Public Domain Retro and Weird. Later, scientists at UCLA estimated that flooding following the collapse of the dam could have killed between 70,000 and 120,000 people. There are various names for this earthquake. Playing next. Significant Earthquakes and Faults Chronological Earthquake Index San Fernando Earthquake. 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. Earthquake - Magnitude 2.5 quake shakes in the San Fernando Valley. Much like the Northridge Earthquake 23 years later, the quake also tore apart freeway overpasses. This shaking occurs when stress that builds up in the crust is … Photo: E. Leyendecker, USGS. 45 years ago - 1971 Sylmar earthquake... Did you experience it? The 1971 San Fernando earthquake, also known as the “Sylmar Quake,” took place on the morning of February 9, 1971 around 6:01am. There are various names for this earthquake. Objects under such forces would have been weightless for a few seconds, like astronauts in space. The February 9, 1971 earthquake in San Fernando Valley, California, caused slides in the embankments of two old adjacent hydraulic fill dams. 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. 2:38. REPORTS San Fernando Earthquake of 9 February 1971: Pattern of Faulting Abstract.  |  The documentary moves along quickly and uses actual newsreel footage as well as well-staged re-enactments, blended together in a leanly edited narrative. 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. 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 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. May 1, 2020 - Explore David's board "sylmar earthquake 1971" on Pinterest. The earthquake that rocked the northern San Fernando Valley, near Sylmar measured magnitude 6.6 on the Richter magnitude scale. 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. This was struck by the earthquake on February 9th of 1971. The epicenter of the quake was located in the San Gabriel Mountains, with numerous nearby Los Angeles communities affected. ", Figure 2: Earthquakes on two blind thrust faults caused severe damage in the San Fernando Valley. Following these to earthquakes, geologists are now sure that many more of these hidden faults crisscross deep beneath the San Fernando Valley. 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. Both the Veteran's Administration Hospital and Olive View Medical Center in Sylmar were severely damaged, accounting for many of the deaths. The Slides in the San Fernando Dams During the Earthquake of February 9, 1971. Dam failure Jul 23, 2015 - SYLMAR - It seemed from summer 1965 until 1971 it was a chaotic time in Southern California. Sometimes they are very strong and other times you would hardly notice them. San Fernando Valley. See more ideas about sylmar, earthquake, san fernando valley. Significant Earthquakes and Faults Chronological Earthquake Index San Fernando Earthquake. 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