1994 northridge earthquake

The earthquake occurred beneath Northridge, a suburb in the San Fernando Valley, 30 km northwest of Los Angeles (see map on next page). The Seismic Hazards Program at CGS continues to produce similar maps throughout California. At 4:30 a.m. on January 17, 1994, the shaking of an earthquake awakened 10 million people in the Los Angeles region of Southern California. The timing of the earthquake (early morning during a federal holiday) is thought to have prevented a higher death toll, as most residents were in their beds, rather than on failed freeways or in other collapsed structures (such as office buildings or parking lots). The 1994 Northridge Earthquake Northridge Earthquake: 1994 quake still fresh in Los Angeles minds after 20 years The 4:31 a.m. jolt hit Los Angeles from 11 … Saved from caliearthquakes2.pbworks.com Updates? On January 17, 1994, at 4:31 a.m. PST, a magnitude 6 .7 earthquake centered in Northridge struck the southern California area. This 22-year-old reinforced concrete-frame department store in Northridge Fashion Center partially collapsed, and much of its second and third floors pancaked. Abstract A magnitude 6.8 (Ms) earthquake centered under the community of Northridge in the San Fernando Valley shook the entire Loss Angeles metropolitan area at 4:31 a.m. local time on … January 20, 1994 — Interstate 5 Freeway overpass as seen from The Old Road in the Newhall Pass. The aftershock areas of the 1994 Northridge, 1987 Whittier Narrows, and 1971 San Fernando earthquakes and principal faults are shown for their relations to the physiography. It is now widely accepted that these types of faults can pose major seismic threats. The 1994 Northridge Earthquake Northridge Earthquake: 1994 quake still fresh in Los Angeles minds after 20 years. Das Erdbeben ereignete sich im San Fernando Valley etwa 32 km nordwestlich der Innenstadt von Los Angeles. Major active faults and epicenters of significant historical earthquakes in Southern California. It is now widely accepted that these types of faults can pose major seismic threats. ConclusionsThe 1994 Northridge earthquake is the sixth major earthquake in California to have occurred on a blind thrust fault in the last 10 years. 4:30am – January 17, 1994, Northridge, California – I was awoken suddenly by what seemed like someone picking up my bed and dropping it. Fatality estimates range from just under 60 to more than 70 people killed, with most studies placing the number at around 60. The 1994 Northridge earthquake was a moment magnitude 6.7 (M w), blind thrust earthquake that occurred on January 17, 1994, at 4:30:55 a.m. PST in the San … The magnitude 6.7 Northridge Earthquake occurred on January 17, 1994 at 4:31 AM, killing more than 60, injuring more than 9,000, and causing widespread damage … Impact Summary; Technical Summary; Northridge California Earthquake January 17, 1994 This article was most recently revised and updated by, https://www.britannica.com/event/Northridge-earthquake-of-1994, National Institute of Standards and Technology - Engineering Laboratory - Earthquake Northridge California 1994, Northridge earthquake of 1994 - Student Encyclopedia (Ages 11 and up). Articles from Britannica Encyclopedias for elementary and high school students. Interested in testing your earthquake knowledge? The magnitude 6.7 Northridge Earthquake occurred on January 17, 1994 at 4:31 AM, killing more than 60, injuring more than 9,000, and causing widespread damage throughout the west San Fernando Valley. It looks like your browser does not have JavaScript enabled. The Northridge earthquake of 1994 — A 64-car freight train carrying hazardous materials was derailed between the Chatsworth and Northridge sections of … Geologic Setting. The extent of the property damage in an area so well-prepared for earthquakes was staggering. This report describes injuries occurring in the Northridge earthquake which resulted in death or hospital admission. Northridge earthquake of 1994, earthquake that struck the densely populated San Fernando Valley in southern California, U.S., on Jan. 17, 1994. It also placed renewed scrutiny on our ambitious Seismic Retrofit program that aims to strengthen hundreds of older freeway bridges to help them withstand the most powerful earthquakes. Although I was not happy with it being named that, do understand that the San Fernando Valley has many many apartment building all through it. The Northridge earthquake struck Los Angeles on 17 January 1994, origthadng from a previously unknown thrust fault. Mike Hider (Saugus High 1983, son of Jerry Hider) said he "spent several days, 24 hours a day, hauling the concrete from those bridges right down the road to the intersection of Highway 126 and I-5. A significant portion of the transportation system around Los Angeles was shut down, as sections of major freeways (including the Santa Monica Freeway and the Golden State Freeway) collapsed and numerous bridges sustained heavy damage. Reducing the impact of these ground-failure hazards, not only save lives and property during future earthquakes, but leads to more sustainable economic communities. This was the first earthquake to strike directly under an urban area of the United States since the 1933 Long Beach earthquake. A total of 58 … 1994 Northridge Earthquake: Performance of Structures, Lifelines and Fire Protection Systems NIST SP 862: Amazon.de: nist: Fremdsprachige Bücher Moderate damage to the built environment was widespread; severe damage included collapsed buildings and highway overpasses. The Northridge earthquake that struck at 4.31 a.m. on Monday, January 17, 1994 affected an area of 2,192 square miles in the San Fernando Valley, a densely populated residential area of northern Los Angeles, California. Its epicentre was in Northridge, a suburb located about 20 miles (32 km) west-northwest of downtown Los Angeles. The earthquake was magnitude 6.7 on a previously unidentified thrust fault, creating strong horizontal and vertical ground motion lasting up to 10 seconds. The earthquake's epicenter was in Northridge, CA, and it was a magnitude 6.7 shock that proved to be the most costly earthquake in United States history. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. Most significantly, the state created the California Earthquake Authority, a publicly managed but privately funded organization offering basic residential earthquake insurance. At 4:30 a.m. on January 17, 1994, the shaking of an earthquake awakened 10 million people in the Los Angeles region of Southern California. On January 17, 1994, at 4:31 a.m. PST, a magnitude 6.7 earthquake centered in Northridge struck the southern California area. Since the magnitude 6.7 Northridge earthquake 20 years ago (January 17, 1994), researchers at the California Institute of Technology (Caltech) have learned much more about where earthquakes are likely to happen, and how danger to human life and damage to property might be mitigated when they do occur. And the Southern California Earthquake Data Center et. The 1994 "Northridge" earthquake hit the Los Angeles area about 4:30 AM on Martin Luther King Day. What's Changed Since the 1994 Northridge Earthquake On Jan. 17, 1994, a magnitude-6.7 earthquake revealed some of the safety issues that Southern California needed to address The duration was about 10 seconds to 20 seconds. I shut my eyes and tried to shake the sleep from my brain with thoughts that I must be having a nightmare. Southern California-Wikipedia As a consequence of the severe losses caused by this event, the Federal Emergency Management Agency (now under the U.S. Department of Homeland Security) awarded the California Geological Survey nearly $20 million to accelerate the zoning of earthquake hazards under the Seismic Hazards Mapping Act of 1990. Local city and county permitting agencies are required to request “special geological and engineering studies” be performed within these zones prior to land development and construction. EQE has been using its three-phase earthquake risk reduction program to evaluate and upgrade the facilities, and was about 75% complete when the Northridge Earthquake occurred. Shake Map Northridge 1994.jpg 612 × 718; 114 KB. Destroyed in the Northridge earthquake of Jan. 17, 1994. Earthquake Northridge California 1994 . Property damage was severe and widespread; although the worst damage was sustained by communities in the western and northern San Fernando Valley, other areas of Los Angeles county were affected, as were parts of Ventura, Orange, and San Bernardino counties. Key Issues for Ground Motion Models • Blind Faults / Buried Ruptures • Hanging-Wall Effects • Large Variation over Short Distances • Non-Linear Site Factors • Velocity Pulse • Basin effects • Vertical Ground-Motions. These Seismic Hazard Zones, or Zones of Required Investigation, delineate where there is a high likelihood of these hazards occurring in future earthquake events. Please refer to the appropriate style manual or other sources if you have any questions. 1994-01-17 12:30:55 UTC Contributed by CI 3 ; Moment Tensor Fault Plane Solution Contributed by US 4 DUPUTEL; View Nearby Seismicity Time Range ± Three Weeks Search Radius 250.0 km Magnitude Range ≥ 3.0 ANSS Comcat ; For More Information. Cal state northridge quake damage.jpg 1,018 × 704; 183 KB. 1994 Northridge Earthquake M6.7, Rev, Dip=42, ZTOR=6 km. The earthquake had a strong moment magnitude at around 6.7, although ground acceleration was one of the highest ever recorded in an urban region of North America. Hundreds of people could have been killed had the earthquake occurred while the store was open. The rubble was recycled. Since the Northridge event, over 6,000 square miles of land covering the greater Los Angeles Metropolitan Area, including all of Orange County and half of Ventura County, and portions of the San Francisco Bay Area have been zoned under the Act. Omissions? Most of the casualties occurred in wood-frame apartment buildings, popular in the San Fernando Valley, and particularly in those with weak first floors or lower-level parking garages. The following is a guest post by my friend Miki who had first-hand experience with the devastating 1994 Northridge earthquake. Known as the Northridge Earthquake, it caused at least 57 fatalities (a subsequent study put the death toll at 72, including heart attacks) and injured thousands. The third major earthquake to occur in the state in 23 years (after the 1971 San Fernando Valley and 1989 San Francisco–Oakland earthquakes), the Northridge earthquake was the state’s most destructive one since the San Francisco earthquake of 1906 and the costliest one in U.S. history. 1994 Northridge earthquake Damage and fatalities. 1994 Northridge Erdbeben - 1994 Northridge earthquake Epizentrum. Media in category "1994 Northridge earthquake" The following 24 files are in this category, out of 24 total. A magnitude 6.8 (Ms) earthquake centered under the community of Northridge in the San Fernando Valley shook the entire Loss Angeles metropolitan area at 4:31 a.m. local time on Monday, January 17, 1994. The most costly American earthquake since 1906 struck Los Angeles on 17 January 1994. Thousands of landslides occurred throughout the mountains surrounding the San Fernando Valley and as far north as Castaic Lake. January 20, 1994 — Interstate 5 Freeway overpass as seen from The Old Road in the Newhall Pass. The following is a guest post by my friend Miki who had first-hand experience with the devastating 1994 Northridge earthquake. The percentage of buildings completely destroyed was relatively low in light of the strength of the ground motions. ConclusionsThe 1994 Northridge earthquake is the sixth major earthquake in California to have occurred on a blind thrust fault in the last 10 years. From CESMD. 1 Three counties, Los Angeles, Ventura and Orange were affected by the These communities are now benefiting from safer development. Once special studies are performed by qualified engineers and geologists, measures to physically mitigate these ground-failure hazards are included in the development plans before permits are issued. Corrections? The Northridge earthquake is part of the temporal increase in earthquake activity in the Los Angeles area since 1970. Author(s) D R. Todd, N J. Carino, R M. Chung, H S. Lew, A W. Taylor, W D. Walton. These types of ground failures caused severe damage to building foundations and to vital lifeline infrastructure (transportation corridors, water, gas, and electric transmission facilities). Accordingly, a number of legislative changes were made in the aftermath of the Northridge earthquake. Schäden und Todesfälle. The mainshock was followed by an energetic aftershock sequence. A magnitude 6.8 (Ms) earthquake centered under the community of Northridge in the San Fernando Valley shook the entire Los Angeles metropolitan area at 4:31 a.m. local time on Monday, January 17, 1994. Northridge earthquake of 1994, earthquake that struck the densely populated San Fernando Valley in southern California, U.S., on Jan. 17, 1994. The earthquake was one of the … If no others agree with the "new" figure it should be reversed. Since the Northridge Earthquake hit southern California in 1994, technology has improved, but "a big one" still may occur, scientists say. Mike Hider (Saugus High 1983, son of Jerry Hider) said he "spent several days, 24 hours a day, hauling the concrete from those bridges right down the road to the intersection of Highway 126 and I-5. At 4:31 a.m. on Jan. 17, 1994, a hidden fault lurking under the city’s San Fernando Valley neighborhoods unleashed a magnitude 6.7 earthquake. Our editors will review what you’ve submitted and determine whether to revise the article. The San Fernando Valley is broadly elliptical, about 30 km long on its east-west axis and 16 km wide. Nevertheless, tens of thousands of buildings were damaged, with many “red-tagged” as unsafe to enter and many more restricted to limited entry (“yellow-tagged”). This model is used to help explain the occurrence of earthquakes like the Northridge … The Northridge Earthquake: January 17, 1994. Timeline: The 1994 Northridge Earthquake A look at events of the Jan. 17, 1994, Northridge earthquake By Jason Kandel • Published January 16, 2014 • Updated on January 17, 2018 at 7:52 am Shake your way into this quiz. Immediately after the earthquake, the California Office of Statewide Health Planning and Development (OSHPD) deployed teams of structural engineers, fire marshals, and construction advisors to survey the approximately 750 state-licensed facilities in the affected area. How big was the earthquake? Please turn on JavaScript and try again. Collapsed Apartment After Northridge Earthquake.jpg 1,200 × 800; 932 KB. 4:30am – January 17, 1994, Northridge, California – I was awoken suddenly by what seemed like someone picking up my bed and dropping it. Widespread liquefaction (saturated soil that behaves as a liquid when shaken) was triggered as far away as the Port of Los Angeles, some 30 miles from the epicenter. The western Transverse Ranges are an outstanding example of a geological model of folds and uplifts produced by slip on buried faults. While every effort has been made to follow citation style rules, there may be some discrepancies. The earthquake occurred along a "blind" thrust fault, close to the San Andreas fault. A magnitude 6.8 (Ms) earthquake centered under the community of Northridge in the San Fernando Valley shook the entire Los Angeles metropolitan area at 4:31 a.m. local time on Monday, January 17, 1994. al. (AP Photo/Nick Ut, File) Twenty-five years ago this week, a violent, pre-dawn earthquake shook Los Angeles from its sleep, and sunrise revealed widespread devastation, with dozens killed and $25 billion in damage. The Northridge Earthquake resulted in considerable disruption to health care facilities over a wide area. Let us know if you have suggestions to improve this article (requires login). During the earthquake, CGS ground motion instruments recorded horizontal accelerations of 1.25g and vertical accelerations of 1.2g (1g = force of gravity). Earthquake Northridge California 1994 . Destroyed in the Northridge earthquake of Jan. 17, 1994. The magnitude 6.7 Northridge earthquake resulted from more than 3 meters of reverse slip on a 15-kilometer-long south-dipping thrust fault that raised the Santa Susana mountains by as much as 70 centimeters. The hypocentral depth was 19 km. The 1994 Northridge Earthquake was a violent natural disaster that took place on Monday, January 17, 1994 at 0430 Pacific Standard Time around the Los Angeles area. The January 17, 1994 Northridge, CA Earthquake An EQE Summary Report, March 1994 Commercial Structures . On the 20th anniversary of the Northridge earthquake, more than 600 people gathered in Los Angeles to share the impacts of the 1994 earthquake, highlight accomplishments of the past two decades, and identify necessary steps forward to make our communities more resilient to future earthquakes. The earthquake's epicenter was in Northridge, CA, and it was a magnitude 6.7 shock that proved to be the most costly earthquake in United States history. Recognizing and fixing these potential problems before development occurs is the most cost-effective way to deal with these earthquake hazards. The current investigation is to determine how well four buildings employing the passive structural control called seismic (base) isolation has survived the 1994 Northridge earthquake. The January 17, 1994 Northridge, CA Earthquake An EQE Summary Report, March 1994 Geology and Seismology . Moderate damage to the built environment was widespread; severe damage included collapsed buildings and highway overpasses. For nearly 20 seconds the ground swayed violently, causing widespread panic as buildings and roadways crumbled under the seismic force, leaving 57 people dead and nearly 9,000 others injured. The major shock lasted 10–20 seconds and registered a magnitude of 6.7. The 1994 Northridge earthquake killed more than 50 people and created widespread devastation in Los Angeles. To score the buildings performances with the help of field records, a procedure for comparison of real base isolated structures with their hypothetical bench-marks had to be chosen. March 1, 1994. This event, called the Northridge 20 Symposium, drew Jul 16, 2012 - California Earthquakes 2 / 1994 Northridge. Fires that broke out in the San Fernando Valley and in Venice and Malibu caused additional harm. Roads and bridges damaged by the Northridge earthquake in California, 1994. The earthquake caused up to $20 billion in damage costs, plus $40+ billion in economic loss, making it the costliest earthquake disaster in U.S. history. Known as the Northridge Earthquake, it caused at least 57 fatalities (a subsequent study put the death toll at 72, including heart attacks) and injured thousands. Talk:1994 Northridge earthquake. Intense ground shaking generated widespread ground failures in the region. 1994 Northridge earthquake.svg 618 × 343; 1.32 MB. I shut my eyes and tried to shake the sleep from my brain with thoughts that I must be having a nightmare. A strong earthquake shook the Los Angeles region on January 17, 1994, at 4:30 am Pacific Standard Time (12:30 UT). 1994 Northridge Earthquake: Performance of Structures, Lifelines and Fire Protection Systems. The Northridge Earthquake of January 17, 1994: Report of Data Collection and Analysis, Part B: Analysis and Trends, EQE International, Inc. and the Geographic Information Systems Group of the Governor’s Office of Emergency Services, April 1997. The epicenter of the 1994 Northridge earthquake was the Los Angeles neighborhood of Reseda — a densely populated area of highways, businesses, and residential properties. Before the earthquake, the seismic risk and operations vulnerability for every facility had been assessed, and detailed seismic analysis had been performed for most. The earthquake measured 6.7 on the Richter scale and caused extensive damage to buildings, utilities and roadways. A strong earthquake shook the Los Angeles region on January 17, 1994, at 4:30 am Pacific Standard Time (12:30 UT). The earthquake occurred just after 4:30 am local time along a previously undiscovered blind thrust fault in the San Fernando Valley. Timeline: The 1994 Northridge Earthquake A look at events of the Jan. 17, 1994, Northridge earthquake By Jason Kandel • Published January 16, 2014 • Updated on January 17, 2018 at 7:52 am. Eight aftershocks of M ≥ 5.0 and 48 aftershocks of 4 ≤ M ≤ 5 occurred between January 17 and September 30, 1994. Earthquake Hazards Zone Application (EQ Zapp), Highway Corridor Landslide Hazard Assessment, School, Hospital, and Environmental Reviews, EQ Zapp (A-P Fault Zones and Seismic Hazard Zones), Information Warehouse (reports, maps, and data), Center for Engineering Strong Motion Data, Visit the California Integrated Seismic Network. This area includes more than 150 incorporated cities and developing county lands that have an aggregate population exceeding 12 million people, and an average annual construction volume of over $10 billion. The Northridge earthquake presented far more than a challenge to find ways around quake damage, and to see how quickly freeways could be rebuilt. I truly don't now why the name was give "Northridge Earthquake", I thought because of the people that lost their lives there. Damage occurred up to 85 miles (125 km) away, with the most damage in the west San Fernando... Valley fever outbreak. The magnitude 6.7 1994 Northridge earthquake was particularly destructive, causing a substantial number of deaths, injuries, and structural collapses as well as the most property damage of any earthquake in U.S. history at an estimated $20 billion. The Northridge earthquake occurred at 4:30 a.m. local time on January 17, 1994. Get a Britannica Premium subscription and gain access to exclusive content. The top three costliest earthquakes in the world during 1980–2012 were the Mw 9.0 Tohoku-Oki earthquake (2011), Mw 6.8 Kobe earthquake (1995), and Mw 6.7 Northridge earthquake (1994), causing overall economic losses at the time of occurrence of about … Published. At 4:30 am, on January 17, 1994, residents of the greater Los Angeles area were rudely awakened by the strong shaking of the Northridge earthquake. The earthquake occurred beneath Northridge, a suburb in the San Fernando Valley, 30 km northwest of Los Angeles (see map on next page). The 4:31 a.m. jolt hit Los Angeles... After the quake, we had a paper to put out. LOS ANGELES – The 1994 Northridge earthquake shook Los Angeles residents from their sleep, caused freeways to crumble and flattened buildings. "On Shaky Ground": Living Through the 1994 Northridge Earthquake. The Jan. 17, 1994 Northridge earthquake was felt over a broad area of Southern California, causing widespread death and destruction. In retrospect, it appeared that the profession was caught largely unaware by the 1994 Northridge earthquake and did not expect the kinds of damage that occurred, particularly in the newer buildings, since the code had been modified significantly just 20 years before, along with other improvements in the intervening years. This earthquake had a 6.9 moment magnitude. The 1994 Northridge earthquake made it obvious that in order to advance the practice of seismic design it was necessary to (1) learn more about various aspects of earthquake ground motions and building response during earthquakes, and (2) develop procedures … The rubble was recycled. Imveracious 19:49, 2 April 2014 (UTC) The Publication Citation: 1994 Northridge Earthquake from the NIST is a old publication and since that time facts have changed to what is known now. FILE - This Feb. 16, 1994 file photo shows the Northridge Meadows apartment complex in which 16 people died when the upper floors collapsed onto the so-called soft story ground floor. Northridge is located about 30 km northwest of Los Angeles. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Out in the Newhall Pass this 22-year-old reinforced concrete-frame department store in Northridge Fashion Center partially collapsed, and from! Damage in an area so well-prepared for earthquakes was staggering AP Photo/Nick UT, File and. Were made in the Newhall Pass increase in earthquake activity in the Angeles. Earthquake '' the following is a guest post by my friend Miki who had first-hand experience with the new! Made to follow citation style rules, there may be some discrepancies an energetic aftershock sequence having a.... The article the percentage of buildings completely destroyed was relatively low in light of the … Northridge! 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