US earthquake: According to the United States Geological Survey, the magnitude 7.0 quake was recorded about 100 kilometers west-southwest of Ferndale at a depth of just 10 kilometers (six miles).
Epicenter and Initial Reports
According to the United States Geological Survey (USGS), a strong 7.0-magnitude earthquake struck off the coast of Northern California near Petrolia in Humboldt County on Thursday. The earthquake, initially reported as a 6.6 magnitude, was later upgraded by the USGS. It occurred at 10:44 a.m. local time.
A tsunami warning issued and Canceled
A tsunami warning was issued for coastal areas in California and Oregon, including San Francisco. However, the National Tsunami Warning Center canceled the alert just before noon, stating there was no longer tsunami danger. The warning initially covered regions from Davenport, California, to the Douglas/Lane Line in Oregon.
Impact and Felt Areas
The quake was felt by over 1.3 million people close to the epicenter, with reports of shaking as far south as San Francisco and as far north as Lincoln City, Oregon. USGS shake alerts reached residents as far south as Salinas, California.
Aftershocks and Likelihood of Future Quakes
The USGS reported over 40 aftershocks in Northern California, including a magnitude 5.0 near Ferndale and a 4.2 near Petrolia. There is a 34% chance of a magnitude 5 or larger earthquake occurring in the next week, with a 5% chance of another magnitude 6 or larger quake.
Damage and Emergency Response
California Governor Gavin Newsom declared a state of emergency following the earthquake. Local authorities have reported:
- Cracks in roads.
- A gas leak at a middle school in Rio Dell.
- Minor roof damage in Ferndale.
- About 10,000 residents are left without power.
Rio Dell Mayor Debra Garnes confirmed no injuries but noted structural impacts. Meanwhile, the Santa Cruz area issued tsunami warnings advising residents to move to higher ground, though these warnings were later lifted.
Federal Response
President Biden has been briefed on the situation. The Federal Emergency Management Agency (FEMA) and regional officials are in contact with state and local authorities, standing ready to assist if needed.
Earthquake Characteristics
The earthquake was classified as a “primarily strike-slip” event, where tectonic plates moved horizontally rather than vertically. This type of movement typically reduces the likelihood of a tsunami, according to the USGS.
Safety Recommendations
Officials have urged residents to prepare for additional aftershocks in the coming days and weeks. Residents are encouraged to have emergency kits ready and stay informed through local authorities.
For tips on earthquake preparedness, see recommendations on assembling an emergency kit and safety plans.
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