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The warning issued was the most widespread since the system went public in 2019. Sensors at Fortuna detected the earthquake at 02:34 and issued warnings as far as the California–Oregon border, south of San Jose, past Shasta County and to Medford, Oregon. Three million people in northern California and southern Oregon received warnings on their smartphones. The earthquake activated ShakeAlert, USGS's earthquake early warning system for the West Coast. Cal Poly Humboldt was closed to all except essential personnel as of 7:16 am. The California Office of Emergency Services (Cal OES) coordinated the responses of local governments (including tribal authorities), Cal Fire, Caltrans, the California Geological Survey, and the California Highway Patrol. Caltrans District 1 closed the Fernbridge over the Eel River on California State Route 211 due to four cracks which could cause the road itself to slide off. PST, PG&E revised the total of customers without power to 71,170. Phones were alerted as far south as the San Francisco Bay Area. The California Independent System Operator (CAISO) declared a transmission emergency. Pacific Gas and Electric (PG&E) at first estimated that 50,000 people were without power in Humboldt County, a number later revised to 60,000. A total of up to 150 homes were damaged or destroyed due to the quake, most of them in Rio Dell. Some businesses in Fortuna and Ferndale sustained damage at storefronts and products fell. At Loleta, bricks toppled from the former Humboldt Creamery building.
California earth quake lines windows#
Glass windows in stores were shattered and homes knocked off their foundations. About 100 people were displaced due to damaged homes. Fifteen buildings collapsed or were severely damaged, including one in a fire caused by the tremors. Initial reports (via radio scanner traffic) indicated several houses were damaged, numerous gas leaks, and power outages in Rio Dell. Damage A damaged bridge ramp at Fernbridge near Ferndale. One of the deaths was related to a cardiac arrest. In both fatalities, ages 72 and 83, emergency workers were unable to attend to them because ambulances were responding to other areas. Two people died due to "medical emergencies" involved with the earthquake, and seventeen others were injured. A magnitude 4.5 earthquake struck six miles west-southwest of Ferndale on March 21 and was attributed as an aftershock by the USGS. Broken windows, large cracks in buildings and power outages were reported in Humboldt County due to this aftershock, and some houses were badly damaged after being shaken from their foundations. On January 1, 2023, a magnitude 5.4 aftershock struck, with a maximum intensity of VII. The largest aftershock of the year measured 4.9 magnitude with a maximum intensity of V ( Moderate). Aftershocks įollowing the mainshock, over 250 aftershocks above magnitude 1.0 occurred, distributed along a distance of 26 km (16 mi). Despite being centered offshore, the fault that triggered the quake travelled onshore and ruptured northeasternwards.
The United States Geological Survey said the earthquake's depth, focal mechanism, and location suggest a likely source within the subducting Gorda Plate. It was the result of strike-slip faulting along either a southeast or southwest striking plane. It came exactly a year after a 6.2 magnitude earthquake struck onshore in the Cape Mendocino area on December 20, 2021, causing only minor damage. The earthquake measured 6.4 on the moment magnitude scale, and had a maximum Mercalli intensity of VIII ( Severe). This tectonic boundary has been the cause of many earthquakes in the region, including the megathrust 1700 Cascadia earthquake, and the 1992 Cape Mendocino earthquakes, the latter of which measured 7.2. The Mendocino Fracture Zone marks the transform boundary between the Gorda and Pacific plates. Much of Northern California lies close to the boundaries between three tectonic plates, the Pacific Plate, the Gorda Plate and the North American Plate, which meet at the Mendocino Triple Junction. 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 a.m.
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