Port Orford, Ore. – A pair of earthquakes struck off the Oregon coast Tuesday afternoon, continuing a stretch of intense seismic activity along the Pacific Northwest. A magnitude 4.9 quake hit about 181 kilometers west-southwest of Port Orford just before noon, followed minutes later by a stronger 5.1 in the same offshore zone.
According to the U.S. Geological Survey, the quakes were centered roughly 10 kilometers below the seafloor. No tsunami warnings were issued, and there are no immediate reports of damage along the coast. Still, USGS data shows the region remains highly active, with at least 11 measurable quakes along the Oregon-California coastline in the past 12 hours alone.
Earlier in the day, a 5.8 quake struck offshore near the Oregon-California border. Seismic monitors also tracked three additional tremors south of Eureka, California, including one close to magnitude 4.0. In total, more than two dozen earthquakes have been recorded across the broader region since Tuesday morning.
Emergency officials remind coastal residents that even moderate offshore quakes can shift stress along fault lines, potentially setting up larger events. While no evacuations have been ordered, experts advise reviewing earthquake safety plans and ensuring emergency kits are ready.
Activity remains concentrated along the Cascadia Subduction Zone and San Andreas fault system, which historically have produced some of the West Coast’s strongest earthquakes. Monitoring continues, with USGS warning aftershocks are possible in the coming days.
