On Thursday morning, a 7.0 magnitude earthquake struck off the coast of Northern California, with its epicenter near Petrolia in Humboldt County, as reported by the United States Geological Survey (USGS). Initially classified as a 6.6 earthquake, it was later upgraded, highlighting its significant impact. Despite the magnitude, there were no immediate reports of major injuries or damage.
Tsunami Warning Issued and Canceled
The quake triggered a tsunami warning for parts of California and Oregon, including San Francisco, placing over 5.3 million residents on alert. However, the National Tsunami Warning Center canceled the alert before noon local time, confirming that there was no imminent tsunami threat. The warning zone initially extended from Davenport, California, to the Douglas/Lane Line in Oregon.
In the Santa Cruz region, phones buzzed with emergency notifications urging residents to move to higher ground, illustrating the swift deployment of the USGS’s early warning system.
Earthquake Details and Aftershocks
The quake, reported at 10:44 a.m. local time, was categorized as “primarily strike-slip,” meaning the tectonic plates moved horizontally, reducing the likelihood of a tsunami. Subsequent tremors included a 5.0 magnitude earthquake near Ferndale and a 4.2 magnitude tremor near Petrolia, contributing to at least 40 aftershocks recorded throughout the day.
Regions Affected
- The earthquake was felt as far south as San Francisco, with reports of rolling motion lasting several seconds.
- Areas such as Eureka, Rio Dell, and other parts of Humboldt County experienced cracks in roads and minor structural damage, including homes off their foundations and a gas leak at a middle school.
State of Emergency Declared
California Governor Gavin Newsom declared a state of emergency, enabling quick mobilization of resources. Meanwhile, state and local officials began assessing damages, with reports of 10,000 residents without power in the affected areas.
Rio Dell Mayor Debra Garnes confirmed there were no injuries but noted minor infrastructure impacts, while Ferndale city officials cited damage to rooftops.
Preparedness and Future Risks
The USGS estimates a 34% chance of another magnitude 5.0 earthquake or higher in the next week, emphasizing the need for ongoing vigilance. Residents in the affected zones are advised to prepare for aftershocks and potential disruptions.
Federal Support
President Joe Biden has been briefed, and federal agencies, including FEMA, are on standby to provide additional assistance if necessary.
Key Takeaways
- The earthquake today serves as a reminder of the seismic risks along the San Andreas Fault and the importance of preparedness.
- The tsunami warning showcased the efficiency of real-time alerts, even though it was later canceled.
- Residents across San Francisco, Humboldt County, and other affected regions must remain cautious, as aftershocks are likely in the coming days.
For more updates on the California earthquake, stay tuned to official sources like the National Weather Service, USGS Earthquake Tracker, and local news outlets.
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