Timeline: The 1994 Northridge Earthquake. Property damage from the earthquake was estimated to be between $13 and $50 billion. 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. California engineers had classified and codified building irregularities as early as 1980s. 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. On January 17, 1994, a magnitude 6.7 earthquake occurred in the San Fernando Valley for approximately 10-20 seconds. The Northridge Earthquake: January 17, 1994 How big was the earthquake? Accordingly, a number of legislative changes were made in the aftermath of the Northridge earthquake. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. I shut my eyes and tried to shake the sleep from my brain with thoughts that I must be having a nightmare. The 1994 Northridge earthquake, however, resulted in further fine-tuning of these definitions Northridge earthquake of 1994, earthquake that struck the densely populated San Fernando Valley in southern California, U.S., on Jan. 17, 1994. Eight aftershocks of M ≥ 5.0 and 48 aftershocks of 4 ≤ M ≤ 5 occurred between January 17 and September 30, 1994 It had a duration of approximately 10–20 seconds. Get a Britannica Premium subscription and gain access to exclusive content. These Seismic Hazard Zones, or Zones of Required Investigation, delineate where there is a high likelihood of these hazards occurring in future earthquake events. Let us know if you have suggestions to improve this article (requires login). The January 17, 1994 Northridge earthquake damaged four major freeways in the Los Angeles metropolitan area, creating the pospect of gridlock in the nation's prototypical automobile city. 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. 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”). The following is a guest post by my friend Miki who had first-hand experience with the devastating 1994 Northridge earthquake. Please refer to the appropriate style manual or other sources if you have any questions. These communities are now benefiting from safer development. 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. 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. The 1994 Northridge earthquake occurred on January 17, at 4:30:55 a.m. PST and was centered in Reseda, a neighborhood in the north-central San Fernando Valley region of Los Angeles, California. The maximum horizontal acceleration at rock (MHA) that the MSW landfills were subjected to during this earthquake did not exceed 0.36 g and, in many cases, was significantly lower. The Northridge earthquake occurred at 4:30 a.m. local time on January 17, 1994. Media in category "1994 Northridge earthquake". A 6.7 magnitude earthquake struck underneath the San Fernando Valley community of Northridge that … Just better. Abstract On January 17, 1994, a magnitude 6.8 earthquake struck Northridge, California, in the northeast suburbs ofLos Angeles. Its epicentre was in Northridge, a suburb located about 20 miles (32 km) west-northwest of downtown Los Angeles. 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. 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. This report summarizes information compiled by the Interagency Committee on Seismic Safety in Construction (ICSSC) on the performance of 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 Northridge is located about 30 km northwest of Los Angeles. The mainshock was followed by an energetic aftershock sequence. Intense ground shaking generated widespread ground failures in the region. Seismology: The Northridge Earthquake and its Aftershocks Egill Hauksson, & Lucile M. Jones Published 1995, SCEC Contribution #138 A strong earthquake shook the Los Angeles region on January 17, 1994, at 4:30 am Pacific Standard Time (12:30 UT). 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 1994 Northridge earthquake killed more than 50 people and created widespread devastation in Los Angeles. When I opened my eyes again, panic … The 1994 Northridge earthquake struck on January 17 and caused $400 million in damage to the campus, the heaviest damage ever sustained by an American college campus. 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. Shake your way into this quiz. Fires that broke out in the San Fernando Valley and in Venice and Malibu caused additional harm. 1994 Northridge earthquake.svg 618 × 343; 1.32 MB. This earthquake had a … 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. In the United States, Subtitle D landfills have been strongly shaken primarily only by the 1994 Northridge earthquake. On January 17, 1994, at 4:31 a.m. PST, a magnitude 6​.7 earthquake centered in Northridge struck the southern California area. Please turn on JavaScript and try again. The percentage of buildings completely destroyed was relatively low in light of the strength of the ground motions. Northridge 20 Symposium Summary Report | 3 Executive Summary 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 … The Los Angeles News Group asked readers across the region to share their memories of Jan. 17, 1994 when a 6.7 magnitude earthquake struck Northridge at 4:30 a.m. While every effort has been made to follow citation style rules, there may be some discrepancies. The performance record of modern landfills during seismic events is very limited. It was the costliest natural disaster in United States history at that time and the total destruction was estimated at $20 billion dollars, with an estimated $49 billion of economic loss. Based on survey responses from 559 firms in the Los Angeles area, this paper summarizes the extent and magnitude of the business losses that can be attributed to transportation disruptions. The earthquake killed 57 and injured 8700. 1994 Northridge earthquake, most of the fatalities occurred in buildings suffering from this particular type of irregular configuration. 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 … Building irregularities as early as 1980s to 10 seconds California, in the of. 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