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. Playing next. Seismologists call it the San Fernando earthquake. We evacuated because the Van Norman Dam was cracked, and they thought it might burst down on the valley! 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. The quake took place at 6 am under the town of Sylmar. The earthquake that rocked the northern San Fernando Valley, near Sylmar measured magnitude 6.6 on the Richter magnitude scale. 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 San Fernando earthquake of February 9, 1971, was a geologic phenomenon not unlike many similar earthquakes that occur every year around the world. 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 … 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 … Below, a look back at the Sylmar Earthquake. 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. Southern California 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 Symlar San Fernando Valley Earthquake of 1971. 28:14. Palmer DF, Henyey TL. 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). Such faults, which are unknown but can produce devastating quakes, are called blind thrust faults. 45 years ago - 1971 Sylmar earthquake... Did you experience it? 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. There are various names for this earthquake. Earthquake Faults and Faulting 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 … 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 Windows shattered. Jun 21, 2017 - San Fernando Valley earthquake (02-09-1971). found: Wikipedia, Feb. 24, 2006 (The Sylmar earthquake struck at 6:00:55 a.m. PST on the morning of February 9, 1971. Preparedness, Risks, and Hazards San Fernando Valley earthquake of Feb. 1971, Sylmar, California Public Domain The red line is the fault on which the Northridge quake occurred in 1994. Final report}, author = {Schiff, A J and Yao, J T.P. Although the Richter magnitude of the tremblor was 6.6, ranking it as moderate to large, but not great, it shook a wide, … Dam failure 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. 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 … … Following these to earthquakes, geologists are now sure that many more of these hidden faults crisscross deep beneath the San Fernando Valley. During the Northridge earthquake in January 1994, more than 50 people were killed and the quake caused damage worth $35 billion. The earthquake was generated by thrust faulting on the Sierra Madre fault. There are various names for this earthquake. The February 9, 1971 earthquake in San Fernando Valley, California, caused slides in the embankments of two old adjacent hydraulic fill dams. The Slides in the San Fernando Dams During the Earthquake of February 9, 1971. 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. from California Geology, April/May 1971, Vol. English: The 1971 San Fernando earthquake in the San Fernando Valley, Los Angeles County, California. 4-5. @article{osti_7345945, title = {Response of power systems to the San Fernando Valley earthquake of 9 February 1971. Sometimes they are very strong and other times you would hardly notice them. Download a PDF of "San Fernando Earthquake of February 9, 1971" by the National Research Council for free. 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. 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. 21st century Contemporary era. Much like the Northridge Earthquake 23 years later, the quake also tore apart freeway overpasses. The February 9, 1971 earthquake in San Fernando Valley, California, caused slides in the embankments of two old adjacent hydraulic fill dams. 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