Description. National Oceanic and Atmospheric Administration. Lessons from the 1994 Northridge Quake. Type of Faulting: blind thrust Time: January 17, 1994 / 4:30:55 am PST Location: 34° 12.80' N, 118° 32.22' W 20 miles west-northwest of Los Angeles 1 mile south-southwest of Northridge Magnitude: MW6.7 USGS Response to an Urban Earthquake - Northridge 1994 (Summary) Sixty people were killed, more than 7,000 injured, 20,000 homeless and more than 40,000 buildings damaged in Los Angeles, Ventura, Orange and San Bernardino Counties as a result of the Northridge earthquake of January 17, 1994. The dataset includes a PIP that shows what is going on inside Earth as the waves propagate from the point of origin. Among those killed in the earthquake were CSUN students Jaime Reyes, 19, and Manuel Sandoval, 24. found: USGS Northridge Earthquake (1994) home page, Apr. Detailed Description. Property damage from the earthquake was estimated to be between $13 and $50 billion. View of cars in a partially collapsed split lower-level garage of This fracturing causes nearby rock to move, producing waves that travel through and across the world. an apartment house on the northeast corner of Hazeltine and 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. The families of Reyes and Sandoval told the Daily Sundial in a February 1994 article that 1, 2003 (titles: Northridge earthquake of 17 January 1994) Change Notes. On January 17, 1994, at 4:31 a.m. PST, a magnitude 6 .7 earthquake centered in Northridge struck the southern California area. The 1994 M6.7 Northridge, CA Shakemap showing MMI (Modified Mercalli Intensity) levels of shaking, with the earthquake epicenter shown as a red star, and the fault shown as a rectangle. columns which allowed "bending" of the outer wall. of fire and water. 9: OSMS 94‑16: Los Angeles Code‑Instrumented Building Records from the Northridge, California Earthquake of January 17 1994: Processed Release No. of Transportation), Southern California Earthquake Data Center, Training and Validation Data Sets for Deep Learning, Division of Geological and Planetary Sciences. This picture shows the exterior paneling from the former second The Northridge earthquake proved that preparing for earthquakes CAN greatly reduce the risk. 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. The January 17, 1994 Northridge earthquake affected the art and practice of structural engineering probably more than any other earthquake in the recent history of our profession. Both gas and water pipes burst beneath Balboa Boulevard Therefore, both P-waves and S-waves can propagate through the inner core. This is because the outer core is a liquid made of mostly of molten iron. There are three main types of seismic waves: P (Primary), S (Secondary), and surface waves. 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 epicentre was located about 30 km west-northwest of Northridge Earthquake Location The Northridge earthquake was one of the most freighting ever to come to Northridge. Epicentered in the San Fernando Valley town of Northridge, California, the earthquake caused serious damage to buildings and sections of elevated freeways; ignited at least one hundred fires as it ruptured gas pipelines; and disrupted water supply systems. • 1989 Loma Prieta earthquake • Provided empirical data for evaluating nonlinear site response • 1994 Northridge earthquake • Site response was not consistent with models based on Loma Prieta • Resolution of Site Response Issues in the Northridge Earthquake (ROSRINE) • Soils in the Northridge eqk region are more linear than soils in 1 Three counties, Los Angeles, Ventura and Orange were affected by the Southern California Earthquake Data Center Northridge Earthquake. The 1994 M6.7 Northridge, CA Shakemap showing MMI (Modified Mercalli Intensity) levels of shaking, with the earthquake epicenter … The hypocentral depth was 19 km. TYPE OF FAULTING: blind thrust Seismic stations are marked on the dataset and on the PIP. (photo: Gregory Davis), Damage on Balboa Boulevard The hospital in Santa Monica shows classic "X"-pattern cracks The 1994 quake was the exception in all senses in our S.F. The Northridge quake took the lives of 57 people, according to a report by the U.S. Geological Survey. 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. LOCATION: 34° 12.80' N, 118° 32.22' W 20 miles west-northwest of Los Angeles 1 mile south-southwest of Northridge 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. It is true that the 1933 Long Beach earthquake resulted in the Field’s act and more stringent design of school buildings. in the shaking of the Northridge earthquake. Moderate damage to the built environment was widespread; severe damage included collapsed buildings and highway overpasses. (photo: Gregory Davis), More San Fernando Valley Apartment Damage 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. shows the closely spaced fractures in the reinforced concrete Northridge Earthquake. The high accelerations, both vertical and horizontal, lifted structures off of their foundations and/or shifted walls laterally. The aftermath of the earthquake saw a few cases of cynical humor 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. MAGNITUDE: MW6.7 On January 17, 1994, at 4:31 a.m. PST, a magnitude 6 .7 earthquake centered in Northridge struck the southern California area. 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 January 17, 1994 Northridge, CA Earthquake. 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. Valley. found: USGS Northridge Earthquake (1994) home page, Apr. Horoscope and astrology data of Nature: Northridge Earthquake 1994 born on 17 January 1994 Reseda, California, with biography first-level garage. The detailed slip history of the Northridge mainshock was investigated using empirical Green's functions (Dreger, 1994), strong-motion, teleseismic and geodetic data sets (Wald and Heaton, 1994a; Wald et al., 1996), and using a genetic algorithm to invert local strong-motions (Zeng and Anderson, 1996). (photo: Kerry Sieh), Health Clinic Damage 2003-04-23: new. Earthquake Northridge California 1994 . The damage and repair cost data were compiled in a database for bridges in the Greater Los Angeles area. The P-waves are characterized by particle motion in the direction of the wave's propagation. Damage was wide-spread, sections of major freeways collapsed, parking structures and office buildings collapsed, and numerous apartment buildings suffered irreparable damage. 1: OSMS 94‑17 Map of the epicentral area. At 4:31 a.m. on January 17, 1994, a 6.7-magnitude quake struck the San Fernando Valley, a densely populated area of Los Angeles located 20 miles northwest of the city’s downtown. 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. Introduction. The earthquake brought home several important lessons. Back to IQR page for 6.4Ml Northridge Earthquake of 17 Jan 1994, 430 PST. 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. A close-up of of this entrance to the parking structure The damage and repair cost data were compiled in a database for bridges in the Greater Los Angeles area. On January 17, 1994 at 4:31 a.m., a magnitude 6.6 earthquake struck the Los Angeles metropolitan area. (photo: Kerry Sieh), San Fernando Valley Apartment Damage The 1987 Whittier Narrows earthquake (M=5.9), like the Northridge shock, occurred on a … 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. On January 17, 1994, a magnitude 6.7 earthquake occurred in the San Fernando Valley for approximately 10-20 seconds. The earthquake killed 57 and injured 8700. 1994 Northridge Earthquake Hasn't Stopped, Hills Have Risen. This earthquake had a 6.9 moment magnitude. Tangled, collapsed stairwell at the northeast corner of the shows the structural failure produced by high vertical acceleration. Abstract. Surface waves, as their name implies, travel over the surface of Earth. This was the first earthquake to strike directly under an urban area of the United States since the 1933 Long Beach earthquake. The earthquake occurred on a blind thrust fault, and produced the strongest ground motions ever instrumentally recorded in an urban setting in North America. At 4:31 A.M., Pacific Standard Time, on Monday, January 17, a moderate but very damaging earthquake with a moment magnitude (Mw) of 6.7 struck the densely populated San Fernando Valley, in northern Los Angeles. About. (photo: Gregory Davis), Damage in Hollywood This origin is called the hypocenter, while the area on the surface of Earth directly above the hypocenter is called the epicenter. It lasted way longer than the usual jolt (almost a half minute) and felt like you were in a waterbed on an ocean-going dinghy flailed about in a storm-tossed sea while, improbably, every heavy duty truck in the universe drove by you rumbling in the streets. S-waves can only travel in a solid, so as an S-wave arrives at the core-mantle boundary, it is reflected back into the mantle as both an S-wave and a P-wave. Gleason Ave., Sunland, LABSN Sta 00058. Rear view of a damaged three-story apartment house with a Engineering Data Center (EDC) Worldwide Ground Response Data Virtual Data Center (VDC) ... Back to IQR page for 6.4Ml Northridge Earthquake of 17 Jan 1994, 430 PST. The report also stated that more than 7,000 people were injured and 20,000 people were displaced from their homes. The duration was about 10 seconds to 20 seconds. Impact to Structural Engineering History in Northern California collapsed structure, did not fail. Observed damage data for all bridges were discriminated by structural characteristics. 1 Three counties, Los Angeles, Ventura and Orange were affected by the TIME: January 17, 1994 / 4:30:55 am PST Aerial view of the collapsed freeway interchange between I-5 and This paper presents the significant findings from a study on damage to bridges during the January 17, 1994 Northridge, CA earthquake. The toppled crown atop the 95-foot high tower of a 1920 Art It is also When earthquakes occur directly beneath a city, it will be subjected to ground motions with peak accelerations approaching the force of gravity, exceeding the levels of shaking anticipated by building codes. 1105 Bluff Rd., Montebello, LABSN Sta 00011. (photo: Gregory Davis), CSUN Parking Structure Damage The inner core is also mostly iron, but is solid due to the higher pressures. (photo: Gregory Davis), Damage in Hollywood partial collapse of the parking level. Description 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 P-waves take 26 minutes to reach the opposite side of Earth, whereas the S-waves take 48 minutes and the surface waves take nearly 90 minutes. The interior of Earth has three regions under the crust: the mantle, the outer core, and the inner core. 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. north of the Simi Valley Freeway from the force of the main ( photo: Ta-Liang Teng), I-5 & Antelope Valley Freeway Damage Back to IQR page for 6.4Ml Northridge Earthquake of 17 Jan 1994, 430 PST. This section of the Stud- ies by Davis and Namson (1994) placed 1.4- to 1.7-mm/yr slip at the location of the previously unknown Northridge fault. earthquake. Fifty-seven people died, more than 9,000 were injured, and more than 20,000 were displaced from their homes by the effects of the quake. Workers survey the corner collapse of the Ara's Pastry store FAULTS INVOLVED: Northridge Thrust (also known as Pico Thrust) several other faults experienced minor rupture, rupture during large aftershocks, or triggered slip Dec 17, 1996. The earthquake killed 57 and injured 8700. The Northridge earthquake occurred at 4:30 a.m. local time on January 17, 1994. Total damage to the campus was Record Summary Download KML ‎10965 Mt. The damage The 1994 Northridge earthquake (M = 6.7) occurred in a heavily populated urban area northwest of Los Angeles, and had many similarities to the 1971 San Fernando earthquake (M = 6.7). Download KML. (photo: Ken Fowler), Santa Monica Freeway Damage National Oceanic and Atmospheric Administration. Santa Monica Freeway had been built across drained wetlands, CSUN parking structure. (photo: Ken Fowler), San Fernando Valley Apartment Damage 1, 2003 (titles: Northridge earthquake of 17 January 1994) Change Notes. the San Fernando Valleyabout 20 miles (31 km) northwest of downtown Los Angeles. Despite the losses, gains made through earthquake hazard mitigation efforts of the last two decades were obvious. Northridge 1994-01-17 12:30:55 UTC. The apartment house on the right, a twin to the 1994 Northridge earthquake Label from public data source Wikidata; Northridge Earthquake (California : 1994) Sources. (photo: Ken Fowler), CSUN Parking Structure Damage here was repaired within three months. Moderate damage to the built environment was widespread; severe damage included collapsed buildings and highway overpasses. The focal mechanism is generally well resolved by seis- mic data, but nevertheless, significant variations among the Contact, chat, social media. garage level. 1, 2003. found: LC database, Apr. The Northridge Earthquake: January 17, 1994 How big was the earthquake? The apartment house on the left has collapsed onto the former earthquake and the south-dipping "Northridge" fault. Observed damage data for all bridges were discriminated by structural characteristics. DEPTH: 18.4 km. On January 17, 1994, a magnitude 6.7 earthquake occurred in the San Fernando Valley for approximately 10-20 seconds. Buckling of freeway support columns under the Simi Valley Northridge is located about 30 km northwest of Los Angeles. These regions were discovered through the study of seismic waves, which travel through the interior of Earth and arrive at seismic stations around the world. This paper presents the significant findings from a study on damage to bridges during the January 17, 1994 Northridge, CA earthquake. Freeway at the north end of the San Fernando Valley. This 2500-car-capacity parking structure, a recent (1991) Organization, jobs, budget the Antelope Valley Freeway (State 14). suffered partial collapse in the intense shaking of the Northridge floor hanging down across the top of the first floor. Part of Interstate 10 west of downtown Los Angeles collapsed Northridge is located about 30 km northwest of Los Angeles. Waves are color-coded red for P-waves, cyan for S-waves, and yellow for surface waves. 2003-04-23: new. Data were collected and reported on the extent of the disruption caused by the quake. Record Summary. Understanding the cause and correcting the problem will be essential to continue building in earthquake prone regions. Property damage from the earthquake was estimated to be between $13 and $50 billion. 1, 2003. found: LC database, Apr. Damage in Santa Monica on Hollywood Boulevard in East Hollywood. Northridge, CA - White Oak Covenant Church - 17645 Saticoy St: Closest dist to fault: 12.9 km Deco building on Hollywood Boulevard. 1994 Northridge earthquake Label from public data source Wikidata; Northridge Earthquake (California : 1994) Sources. Science On a Sphere® Event Name: Northridge Earthquake Event Date: 1/17/1994 12:30 UTC (04:30 am PST) … Systems of concealed faults under the Los Angeles area are more complex than previously thought. Damage to wood-frame apartment houses was very widespread in the San Fernando Valley and Santa Monica areas, especially to structures with "soft" first floor or lower-level parking garages. S-waves, on the other hand, produce particle motion at right-angles to the propagation direction. The hypocentral depth was 19 km. addition to the Cal State University - Northridge campus, shock, creating this bizarre and destructive combination This buckling The 1994 Northridge earthquake was one of the costliest natural disasters in U.S. history. Retrofits of masonry building helped reduce loss of life, hospitals suffered less structural damage than in 1971 San Fernando earthquake, and emergency response was exemplary.
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