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The 1971 San Fernando earthquake struck at 6:00:55 a.m. PST on the morning of February 9, 1971. The earthquake that rocked the northern San Fernando Valley, near Sylmar measured magnitude 6.6 on the Richter magnitude scale.[1] February 9 is the 40th day of the year in the Gregorian calendar. ...
1971 (MCMLXXI) was a common year starting on Friday. ...
An earthquake is the result from the sudden release of stored energy in the Earths crust that creates seismic waves. ...
San Fernando Valley from southwestern edge. ...
To meet Wikipedias quality standards, this article or section may require cleanup. ...
The Richter magnitude scale (or more correctly local magnitude ML scale) assigns a single number to quantify the amount of seismic energy released by an earthquake. ...
There are various names for this earthquake. Seismologists call it the San Fernando earthquake.USGS 'Sylmar Quake' or 'Sylmar earthquake' is the name initially given to the event by local media outlets, because the worst damage was to the Olive View Medical Center, located in Sylmar. Local veterans of 'the Sylmar Quake' commonly refer to this seismic event as the 'February Ninth' quake. Seismology (from the Greek seismos = earthquake and logos = word) is the scientific study of earthquakes and the movement of waves through the Earth. ...
Location
The Southern California Earthquake Data Center[1] reports that the epicenter was on the other side of the San Gabriel Mountains from Sylmar, as indicated on this Google Map. This Instrumental Intensity Map identifies the same location using a star shaped symbol "centered in Iron Canyon, in the Sand Canyon area of Canyon Country". These maps help explain why the seemingly distant cities of Sylmar and San Fernando received the brunt of the damage: the quake energy was focused within the sparsely populated San Gabriel Mountains, extending slightly into the northeastern end of the densely populated San Fernando Valley. San Gabriel Mountains The San Gabriel Mountains are located in northern Los Angeles County and western San Bernardino County, California, USA. The mountain range forms a barrier between the Greater Los Angeles Area and the Mojave Desert. ...
This article needs to be cleaned up to conform to a higher standard of quality. ...
This article needs to be cleaned up to conform to a higher standard of quality. ...
San Fernando is a city located in Los Angeles County, California, United States. ...
San Gabriel Mountains The San Gabriel Mountains are located in northern Los Angeles County and western San Bernardino County, California, USA. The mountain range forms a barrier between the Greater Los Angeles Area and the Mojave Desert. ...
San Fernando Valley from southwestern edge. ...
Damage The earthquake ruptured a segment of the San Fernando fault zone, a set of north-dipping, high-angled reverse faults along the southeastern margin of the San Gabriel Mountains. San Gabriel Mountains The San Gabriel Mountains are located in northern Los Angeles County and western San Bernardino County, California, USA. The mountain range forms a barrier between the Greater Los Angeles Area and the Mojave Desert. ...
It caused more than 10 miles of discontinuous surface ruptures with average displacements of about 3 feet both horizontally and vertically. A strong aftershock sequence followed the main shock and included four quakes in the Magnitude 5 range. Aftershocks are earthquakes in the same region of the mainshock (generally within a few rupture length) but of smaller magnitude and which occur with a pattern that follows Omoris law. ...
The quake claimed 65 lives and caused more than half a billion dollars in damage, including the destruction of two hospitals, a freeway interchange and the Lower Van Norman Dam. Damage to the dam caused concern that the dam, of the Earthen Bulwark type, might collapse, in whole or in part. [2] Much confusion ensued as various agencies declared a need for mandatory evacuations, or voluntary evacuations of various portions of the San Fernando Valley below the dam. This depended on which agency was consulted, and often the evacuees were not able to be informed of the status of an evacuation in a timely manner, often returning home just as the police arrived to notify them of a new evacuation order, or evacuating at a moment when officials decided not to evacuate. Communication was made difficult by disruption of telephone, water, and electrical service. For the record label, see Hospital Records. ...
In the field of road transport, a road junction is a place where two or more roads either meet or cross. ...
The most spectacular damage included the collapse of structures at Olive View Hospital in Sylmar (which had opened just a month prior to the earthquake) and at the Veterans Administration Hospital at San Fernando, where 49 people died. The earthquake pushed Olive View Medical Center a foot off its foundation, causing the first floor to collapse, killing three patients and a hospital worker. A freeway overpass connecting the Interstate 5 freeway and the Antelope Valley Freeway also collapsed, which resulted in the death of at least two people. (This interchange was rebuilt and reopened in 1973, but collapsed again 21 years later during the 1994 Northridge Earthquake, killing one.) San Fernando is a city located in Los Angeles County, California, United States. ...
Interstate 5 (abbreviated I-5) is the westernmost interstate highway in the continental United States. ...
California State Route 14 is a north-south state highway largely in the Mojave Desert of the U.S. State of California, also known as the High Desert, just east of the crest of the Sierra Nevada in its northern part. ...
The occurred on January 17, 1994 at 4:30:55 AM Pacific Standard Time in the city of Los Angeles, California, falling on in 1994. ...
Landslides were widespread and caused extensive damage throughout the San Gabriel Mountains. Landslide of soil and regolith in Pakistan A landslide is a geological phenomenon which includes a wide range of ground movement, such as rock falls, deep failure of slopes and shallow debris flows. ...
The earthquake disrupted several motion pictures being filmed at the time in the Los Angeles area, including The Omega Man. The quake also served as the inspiration for the 1974 film, Earthquake. Flag Seal Nickname: City of Angels Location Location within Los Angeles County in the state of California Coordinates , Government State County California Los Angeles County Mayor Antonio Villaraigosa (D) Geographical characteristics Area City 1,290. ...
The Omega Man is a 1971 science fiction thriller starring Charlton Heston. ...
1974 (MCMLXXIV) was a common year starting on Tuesday. ...
Earthquake is a 1974 disaster film that was among several box-office successful disaster films of the 1970s that places a recognizable all-star cast in life and death situations. ...
The quake occurred just as many radio stations were beginning their hourly news programming. On Los Angeles AM station KMPC-710, newscaster Tom Wayman was interrupted hafway through his first story and said "[We're] having an earthquake--a very severe earthquake." On another station, as recounted years later by Dick Clark, the announcer was startled by the shaking and started making flustered comments until he was sure it was over. For other uses, see News (disambiguation). ...
This article does not cite any references or sources. ...
Legislation In response to the February Ninth quake, as it is known locally, building codes were strengthened and the Alquist Priolo Special Studies Zone Act was passed in 1972. The purpose of this act is to prohibit the location of most structures for human occupancy across the traces of active faults and to mitigate thereby the hazard of fault rupture.[1] The Alquist-Priolo Earthquake Fault Zoning Act was signed into California law on December 22, 1972 to mitigate the hazard of surface faulting to structures for human occupancy. ...
References - ^ a b Southern California Earthquake Data Center
- ^ LAFire.com
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