A magnitude 5.4 earthquake has rocked California with tremors felt for miles.
The United States Geological Survey reports a magnitude 5.6 earthquake has struck 102km west of Petrolia in California.
On Twitter, @dr_iOns tweeted: "We just had an earthquake. Humboldt County California"
The US National Tsunami Warning Center advises a tsunami is thankfully currently not expected after the quake.
On its official account @NWS_NTWC, the organisation said: "Tsunami Info Stmt: M5.8 065mi SW Eureka, California 1144PDT May 21: Tsunami NOT expected."
@faithdefender tweeted: "A rather large earthquake just hit right off the shore of California, shallow too. hope everybody's safe."
The USGS has issued a green alert for shaking-related fatalities and economic losses stating "There is a low likelihood of casualties and damage."
Intel Point Alert tweeted: "5.1 magnitude earthquake strikes near California coastline; no tsunami expected."
Meanwhile local news site Fox11 Los Angeles reported the earthquake was a 5.6 magnitude, and that it rattled Northern California coast.
The USGS says the quake was reported at 11.45am local time, about 74 miles southwest of Eureka, the largest coastal city between San Francisco and Portland, Oregon, and was recorded at a depth of about 1.3 miles.
The local news site reports that there were no immediate reports of damage or injuries.
Meanwhile the LA Times reports the Quake was felt 92 miles from Fortuna, a city on the northeast shore of the Eel River, 94 miles from Eureka and 98 miles from Myrtletown.
It reports that there have been no earthquakes of magnitude 3.0 or greater centred nearby in the last 10 days.
But California is always on alert for the next destructive quake.
Earlier this month, on May 12, California experienced one of its largest tremors this year.
Two powerful earthquakes rocked the state with shaking felt in cities such as Sacramento and Chico in the early hours of Friday as the the USGS confirmed the second May 12 quake measured 5.3 on the Richter scale at a depth of 6 miles.
It was one of the largest tremors in the area since quakes known as the 'Ridgequest Sequence' in 2019 and another in December 2022, when magnitude quakes of 6.4 followed by 7.1 were recorded.
Seismologist Dr Lucy Jones said on Twitter at the time: "Another quake near the town of Ferndale was recorded at 6.4 magnitude in December last year.
"Earthquakes with magnitudes between 5.0 and 6.0 occur in the region only around five times a year."
