A 6.2 magnitude earthquake off the coast of Northern California rattled a wide swath of the state shortly after noon local time, according to data from the US Geological Survey.
The quake hit at 12:10 p.m. and was centered just off Cape Mendocino near Humboldt County, 30.8 miles southwest of Ferndale, 36.3 miles west-southwest of Fortuna and 45.2 miles southwest of Eureka, the USGS said.
Its epicenter is in a completely different zone from the seismic cluster of the Blanco fracture zone on Dec 7th (Pacific and Juan De Fuca interact each other); and this logically, has no important repercution with the Cascadia subduction zone and the San Andrés fault. pic.twitter.com/L9uYAhN0eh
— 🅰11乇刀 爪卂乂乂 (@AlMaXx8017) December 20, 2021
Tremors were felt as far away as San Francisco and Chico, California.
A tsunami was not expected, according to the U.S. National Tsunami Warning Center.
@PNSN1 @usgs_seismic Hi team,this 6.2 quake depicted that happened 7 minutes ago is close to the Cascadian Subduction Zone (thin red line) Coincidentally there’s a 4.1 quake reported between Eugene and Albany Oregon. Is this 6.2 quake strong enough to shake the CSZ and spur more? pic.twitter.com/3uuwxKxOZp
— ❄️Bro-D Mendoza❄️ (@BrodyMendoza10) December 20, 2021
“It was slow rolling at first, but then it really got going,” Humboldt County Sheriff William Honsal tells CNN. “We haven’t had a shake like this since 2010.”
6.2 magnitude earthquake off Cape Mendocino, 45 miles SW of Eureka. NO TSUNAMI THREAT. Moderate to strong shaking in parts of our area, especially Eureka south to Petrolia. Some minor damage reported due to fallen household objects. Did you feel it? https://t.co/XHJC3Y3GgN https://t.co/gPnxtiY7MZ
— NWS Eureka (@NWSEureka) December 20, 2021
Humboldt County emergency responders are assessing damage but have had no word of injuries or catastrophic damage.
Some minor damage to buildings, including broken glass, has been found, Honsal said.
— Fish News (@FishNewsChannel) December 20, 2021
A swarm of more than 40 earthquakes in 24 hours is causing a buzz in the northwest US
California’s early earthquake warning system worked for those who are signed up for alerts to their mobile devices. Honsal said he received the alert about 10-15 seconds before feeling the earth shake.
🇺🇸🚨 — WATCH: This video by @caroline95536 shows the inside of a home, after the 6.1 earthquake rattled the area off the Northern California cost.
— Belaaz News (@TheBelaaz) December 20, 2021
The state’s Office of Emergency Services is “actively monitoring” and “coordinating closely with local partners in the region to protect communities from any secondary impacts,” the agency tweeted.
🔴CALIFORNIA: STRONG #EARTHQUAKE MAGNITUDE 6.2 HIT 172 km WEST of REDDING!🚨
— California🇺🇸🦅 (@OldPrague) December 20, 2021
Humboldt County is sparsely populated, with about 135,000 residents spread over about 4,000 square miles. The area is near the California/Oregon border, about 270 miles north of San Francisco.
Earthquake. California pic.twitter.com/hznsPtChS2
— Jose Antonio Lopez (@jalcantico) December 20, 2021
Several aftershocks have been detected, but a tsunami is not expected, according to the sheriff’s office.
The quake hit right on the Mendocino Triple Junction (MTJ), the point where the Gorda plate, the North American plate, and the Pacific plate meet, in the Pacific Ocean near Cape Mendocino in northern California.
This triple junction is the location of a change in the broad plate motions which dominate the west coast of North America, linking convergence of the northern Cascadia subduction zone and translation of the southern San Andreas Fault system.
The two most dangerous earthquake faults on the west coast may have far more interaction than previously thought and are overdue for a big and deadly one.
Since they are linked t the Triple Junction, an earthquake on the Cascadia Subduction Zone can trigger a similar shaker on the San Andreas fault to the south and thus create a giant seismic event along the U.S. West Coast.
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