1954 Eureka earthquake

Earthquake in California, United States 1954 Eureka earthquake California 1954-12-21 19:56:29 891371 ushis2000 1954 12 21 11:56 am Pacific Time 6.5 w y 40.78 -123.87 type:event_region:US-CA inline,title Unknown North Coast (California) United States $2 million 7 1 death, 50 injuries The 1954 Eureka earthquake occurred at 11:56 am on December 21, just east of Eureka and Arcata, California in the United States. The unknown type shock had a moment magnitude of 6.5 and a maximum Mercalli intensity of VII (Very strong). Buildings swayed, windows were broken, and the Humboldt County Courthouse collapsed. A total of US$2 million damages was counted, with one death and 50 injuries. Geology Geology and geological history of California The earthquake was located within the Franciscan subduction complex, taking up northwestern California.Dumitru Trevor A. Ernst W.G. Hourigan Jeremy K. McLaughlin Robert J. 2015-06-11 Detrital zircon U–Pb reconnaissance of the Franciscan subduction complex in northwestern California https://www.tandfonline.com/doi/full/10.1080/00206814.2015.1008060 International Geology Review 57 5–8 767–800 10.1080/00206814.2015.1008060 0020-6814 The history of the subduction complex spans for about 150 million years, with significant events happening in this time period.Wakabayashi John 2015-02-03 Anatomy of a subduction complex: architecture of the Franciscan Complex, California, at multiple length and time scales http://dx.doi.org/10.1080/00206814.2014.998728 International Geology Review 57 5–8 669–746 10.1080/00206814.2014.998728 0020-6814 subscription Rutte Daniel Garber Joshua Kylander-Clark Andrew Renne Paul 2021-03-04 An Exhumation Pulse From the Nascent Franciscan Subduction Zone (California, USA) 10.5194/egusphere-egu21-12967 free Regularly, faults are hidden beneath the ocean, but at this particular subduction complex, the faults can be spotted piercing through land. The faults are considered active, with evidence of rupture originating within the last 10,000 years.Dengler Lori 27 July 2024 Not My Fault: An earthquake enigma: Where was the 1954 earthquake located? https://kamome.humboldt.edu/sites/default/files/7_27_24_blue_lake%201954.pdf Times-Standard Humboldt County Earthquake The earthquake struck Eureka, Arcata, and the surrounding Humboldt County on December 21, 1954, at approximately 11:56 am. The earthquake had a magnitude of 6.5 w with an unknown depth.M 6.5 – The 1954 Eureka-Arcata, California Earthquake https://earthquake.usgs.gov/earthquakes/eventpage/ushis2000/executive 2024-10-08 United States Geological Survey There have been an estimated 10 attempts to locate the earthquake. Contributing to this problem was the reduction of operating seismic stations within Humboldt County, with a total of two seismic stations. Other nearby seismic stations also recorded the earthquake, though these attempts were not that useful. For the earthquake, a total of two radio signals were sent, which helped identify the time of the earthquake. Damage In local areas, chimneys toppled, windows shattered, and ancient buildings swayed dangerously.2017-12-21 THROWBACK THURSDAY: Remembering the Dec. 21, 1954 earthquake https://www.times-standard.com/2017/12/21/throwback-thursday-remembering-the-dec-21-1954-earthquake/ 2024-10-08 Times-Standard The earthquake caused the Humboldt County courthouse to be deemed uninhabitable, prompting reconstruction of the building.Court House Plans Approved by Board https://cdnc.ucr.edu/?a=d&d=BLA19570425.2.10&srpos=4&e=-------en--20--1--txt-txIN-1954+Eureka+earthquake------- April 25, 1957 Blue Lake Advocate University of California, Riverside The Sweasey Dam broke, threatening nearby areas. In addition, a 65000 U.S.gal L on water tank fell, located near Fortuna, California. Aftermath Soldiers of the United States Armed Forces inspected some harbors of Humboldt County for damage. Damage was found in the jetties, prompting repair money costing US$300,000.$300,000 Jetty Repairs Scheduled for Spring https://cdnc.ucr.edu/?a=d&d=BLA19570307.2.11&srpos=5&e=-------en--20--1--txt-txIN-1954+Eureka+earthquake------- March 7, 1957 Blue Lake Advocate University of California, Riverside A total of US$2 million damages was counted, with one death and 50 injuries. References Further reading Steinbrugge Karl V. Moran Donald F. An Engineering Study Of The Eureka, California, Earthquake Of December 21, 1954 Bulletin of the Seismological Society of America 47 2 1957 1943-3573 10.1785/BSSA0470020129 129–153 Category:Earthquakes in California Category:1954 earthquakes