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زلزال سان فرناندو 1971 هو زلزالٌ وقعَ في كاليفورنيا في الولايات المتحدة بتاريخ 9 فبراير 1971. (ar) The 1971 San Fernando earthquake (also known as the 1971 Sylmar earthquake) occurred in the early morning of February 9 in the foothills of the San Gabriel Mountains in southern California. The unanticipated thrust earthquake had a magnitude of 6.5 on the Ms scale and 6.6 on the Mw scale, and a maximum Mercalli intensity of XI (Extreme). The event was one in a series that affected Los Angeles county in the late 20th century. Damage was locally severe in the northern San Fernando Valley and surface faulting was extensive to the south of the epicenter in the mountains, as well as urban settings along city streets and neighborhoods. Uplift and other effects affected private homes and businesses. The event affected a number of health-care facilities in Sylmar, San Fernando, and other densely populated areas north of central Los Angeles. The Olive View Medical Center and Veterans Hospital both experienced very heavy damage, and buildings collapsed at both sites, causing the majority of deaths that occurred. The buildings at both facilities were constructed with mixed styles, but engineers were unable to thoroughly study the buildings' responses because they were not outfitted with instruments for recording strong ground motion, and this prompted the Veterans Administration to later install seismometers at its high-risk sites. Other sites throughout the Los Angeles area had been instrumented as a result of local ordinances, and an unprecedented amount of strong motion data was recorded, more so than any other event up until that time. The success in this area spurred the initiation of California's Strong Motion Instrumentation Program. Transportation around the Los Angeles area was severely afflicted with roadway failures and the partial collapse of several major freeway interchanges. The near total failure of the Lower Van Norman Dam resulted in the evacuation of tens of thousands of downstream residents, though an earlier decision to maintain the water at a lower level may have contributed to saving the dam from being overtopped. Schools were affected, as they had been during the 1933 Long Beach earthquake, but this time amended construction styles improved the outcome for the thousands of school buildings in the Los Angeles area. Another result of the event involved the hundreds of various types of landslides that were documented in the San Gabriel Mountains. As had happened following other earthquakes in California, legislation related to building codes was once again revised, with laws that specifically addressed the construction of homes or businesses near known active fault zones. (en) Das San Fernando-Erdbeben von 1971 (auch bekannt als Sylmar-Erdbeben) ereignete sich am 9. Februar 1971 um 6:00:55 Uhr Ortszeit (14:00 UTC) im San Fernando Valley nahe Sylmar, einem Stadtteil von Los Angeles, mit einer Magnitude Mw von 6.6. Das Erdbeben ist unter verschiedenen Namen bekannt. Seismologen nennen es „San Fernando Erdbeben“, ebenso der United States Geological Survey (USGS). „Sylmar-Beben“ oder „Sylmar-Erdbeben“ ist der Name, der dem Beben anfänglich von den lokalen Nachrichtenmedien gegeben wurde, da die schlimmsten Schäden am Olive View Medical Center in Sylmar auftraten. Die Betroffenen des Bebens bezeichneten es auch als „February Ninth“, das „Beben vom 9. Februar“. (de) El terremoto de San Fernando de 1971 (también conocido como Terremoto de Sylmar) golpeó el valle de San Fernando cerca de Sylmar a las 6:00:55 a.m. PST el 9 de febrero de 1971, con una magnitud en la escala Richter de 6,6. Hay varios nombres para este terremoto. Los sismólogos lo llaman el terremoto de San Fernando. USGS 'Sylmar Quake' o 'Sylmar earthquake' es el nombre inicialmente dado al acontecimiento por los medios locales debido a que el peor daño se produjo en el centro médico Olive View, ubicado en Sylmar. Veteranos locales del 'the Sylmar Quake' a menudo se refieren a este acontecimiento sísmico como el terremoto del "Nueve de febrero". El terremoto rompió un segmento de la . Supuso la pérdida de 65 vidas y causaron más de 500 millones de dólares en daños (es) サンフェルナンド地震（San Fernando earthquake）は、1971年2月9日早朝に、アメリカ合衆国カリフォルニア州のサンフェルナンド・バレー付近で発生した地震。地震の規模はM6.4（M6.6とも）で、サンアンドレアス断層の活動により発生したとみられる。 (ja) |
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زلزال سان فرناندو 1971 هو زلزالٌ وقعَ في كاليفورنيا في الولايات المتحدة بتاريخ 9 فبراير 1971. (ar) サンフェルナンド地震（San Fernando earthquake）は、1971年2月9日早朝に、アメリカ合衆国カリフォルニア州のサンフェルナンド・バレー付近で発生した地震。地震の規模はM6.4（M6.6とも）で、サンアンドレアス断層の活動により発生したとみられる。 (ja) The 1971 San Fernando earthquake (also known as the 1971 Sylmar earthquake) occurred in the early morning of February 9 in the foothills of the San Gabriel Mountains in southern California. The unanticipated thrust earthquake had a magnitude of 6.5 on the Ms scale and 6.6 on the Mw scale, and a maximum Mercalli intensity of XI (Extreme). The event was one in a series that affected Los Angeles county in the late 20th century. Damage was locally severe in the northern San Fernando Valley and surface faulting was extensive to the south of the epicenter in the mountains, as well as urban settings along city streets and neighborhoods. Uplift and other effects affected private homes and businesses. (en) Das San Fernando-Erdbeben von 1971 (auch bekannt als Sylmar-Erdbeben) ereignete sich am 9. Februar 1971 um 6:00:55 Uhr Ortszeit (14:00 UTC) im San Fernando Valley nahe Sylmar, einem Stadtteil von Los Angeles, mit einer Magnitude Mw von 6.6. (de) El terremoto de San Fernando de 1971 (también conocido como Terremoto de Sylmar) golpeó el valle de San Fernando cerca de Sylmar a las 6:00:55 a.m. PST el 9 de febrero de 1971, con una magnitud en la escala Richter de 6,6. El terremoto rompió un segmento de la . Supuso la pérdida de 65 vidas y causaron más de 500 millones de dólares en daños (es) |
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زلزال سان فرناندو 1971 (ar) San-Fernando-Erdbeben von 1971 (de) 1971 San Fernando earthquake (en) Terremoto de San Fernando de 1971 (es) サンフェルナンド地震 (ja) |
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