Port Orford, OR – A magnitude 5.8 earthquake struck very late Monday night off the coast near the Oregon-California border, shaking the offshore region and setting off a cluster of aftershocks into Tuesday morning.
According to the U.S. Geological Survey, the quake occurred at 4:08 a.m. UTC, which was just before midnight locally, about 165 kilometers (102 miles) west-southwest of Port Orford, Oregon. The quake originated roughly 9 miles below the ocean floor.
The U.S. Tsunami Warning System confirmed that no tsunami threat is expected from this earthquake. Following the main shock, several aftershocks were recorded, the largest measuring magnitude 4.9, along with smaller quakes of 4.4, 3.3 and others. Seismologists said the activity represents a developing offshore swarm.
Residents along the southern Oregon coast reported feeling light shaking, but there were no immediate reports of injuries or damage. According to community internet intensity maps from the USGS, shaking was felt primarily along coastal communities but remained minor in impact.
The USGS noted there is a 73% probability of more aftershocks of magnitude 3 or greater within the next week, and a 28% chance of aftershocks stronger than magnitude 4. The chance of an even larger quake than the initial 5.8 remains very low.
This section of the Pacific is near the Cascadia Subduction Zone, a fault system capable of producing significant seismic events. While Tuesday’s quake was moderate in size, scientists continue to monitor the area for additional seismic movement.
Officials advised coastal residents to stay alert to official updates, even though no tsunami warning has been issued.
This article was produced by a journalist and may include AI-assisted input. All content is reviewed for accuracy and fairness.
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