Editing Eureka, California (section)

===Significant earthquakes===
{{see also|List of earthquakes in California}}

The area regularly experiences large earthquakes as it is situated on the southern end the [[Cascadia subduction zone]] and near the [[San Andreas Fault]], which interface around the [[Mendocino triple junction]].<ref name = "woodshole"/> On December 20, 2022, a magnitude 6.4 earthquake struck Ferndale, California in Humboldt County, United States at 10:34:25 UTC, or 2:34&nbsp;a.m. PST. On January 9, 2010, a [[2010 Eureka earthquake|6.5 magnitude earthquake]] occurred about {{convert|33|mi|km}} off shore from Eureka.<ref name="latimes1">{{cite news|url=http://www.latimes.com/news/local/la-me-eureka-quake10-2010jan10,0,4204701.story |title=Magnitude 6.5 earthquake rattles Eureka in Northern California |work=Los Angeles Times |date=January 9, 2010 |access-date=January 9, 2010 |archive-url=https://web.archive.org/web/20100111201022/http://www.latimes.com/news/local/la-me-eureka-quake10-2010jan10%2C0%2C4204701.story |archive-date=January 11, 2010 |url-status=dead }}</ref> After two seconds, it became a violent "jumper", making objects fly;<ref name="KBCS">Radio news report, KCBS (San Francisco Bay Area)</ref> the mostly vertical shocks from the ground led to broken windows in shops, overturned shelving in homes and stores, and damage to architectural detail on a number of historic buildings.<ref name="latimes1"/><ref>[[Stephen A. Mahin|Mahin, Stephen]], [http://peer.berkeley.edu/news/2010/eureka_eq_jan_2010.html Preliminary Observations from the Ferndale Area Earthquake of Jan 9, 2010] {{Webarchive|url=https://web.archive.org/web/20130412034505/http://peer.berkeley.edu/news/2010/eureka_eq_jan_2010.html |date=April 12, 2013 }} Pacific Earthquake Engineering Research Center, January 12, 2010. Retrieved April 30, 2013</ref> Local hospitals treated mostly minor related injuries, and electrical power was out over a large area. Numerous natural gas leaks occurred, but no fires resulted.<ref name="KBCS"/><ref name="Mag5.9">[https://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/nc71348851.php Magnitude 5.9 – OFFSHORE NORTHERN CALIFORNIA 2010 February 04 20:20:21 UTC] {{webarchive |url=https://web.archive.org/web/20111015123039/http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/nc71348851.php |date=October 15, 2011 }}, USGS. Retrieved April 30, 2013</ref> This was the largest recent earthquake since the [[1992 Cape Mendocino earthquakes|April 25–26, 1992 sequence]].<ref name="Historic">[https://earthquake.usgs.gov/earthquakes/states/events/1992_04_25_26.php Historic Earthquakes (Cape Mendocino)] {{webarchive|url=https://web.archive.org/web/20161201081440/https://earthquake.usgs.gov/earthquakes/states/events/1992_04_25_26.php |date=December 1, 2016 }}, USGS. Retrieved April 30, 2013</ref> It was followed on February 4, 2010, by a magnitude 5.9 earthquake which struck about {{convert|35|mi|km}} northwest of the community of [[Petrolia, California|Petrolia]] and nearly {{convert|50|mi|km}} west of Eureka. The shaking was felt within a {{convert|150|mi|km|adj=on}} radius, as far north as southern Oregon and as far south as [[Sonoma County, California|Sonoma County]].<ref name = "Historic"/><ref>Robbins, Gary, [http://sciencedude.blog.ocregister.com/2010/02/04/60-earthquake-hits-northern-california/85191/ 5.9 earthquake shakes northern California] {{Webarchive|url=https://web.archive.org/web/20131029202408/http://sciencedude.blog.ocregister.com/2010/02/04/60-earthquake-hits-northern-california/85191/ |date=October 29, 2013 }}, Orange County Register, February 4, 2010. Retrieved April 30, 2013</ref> The largest recorded in the area was the 7.2 {{M|w}} event on [[1980 Eureka earthquake|November 8, 1980]].<ref>[http://earthquaketrack.com/us-ca-eureka/biggest Biggest Earthquakes Near Eureka, California, United States], USGS, 2013. Retrieved April 30, 2013</ref><ref>[http://earthquaketrack.com/quakes/1980-11-08-10-27-34-utc-7-2-19 7.2 magnitude earthquake November 08, 1980 10:27 UTC], USGS, 2013. Retrieved April 30, 2013</ref> The larger earthquakes can pose a tsunami threat to coastal areas.<ref>{{cite web|url=http://nctr.pmel.noaa.gov/tsu400/documents/Course_1_Day_2/Session_11/NCEE_patton_dengler.pdf |title=Data |website=nctr.pmel.noaa.gov |access-date=September 26, 2019}}</ref>
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