Seattle, WA – A cluster of offshore earthquakes is shaking the Pacific Northwest this afternoon, with more than a dozen tremors recorded off the Washington and Oregon coastline within hours, including a magnitude 4.1 event.
According to the U.S. Geological Survey, the strongest quake struck around mid-afternoon Sunday roughly 10 kilometers deep beneath the ocean floor, about 80 to 100 miles off the Washington coast. Several additional quakes ranging from magnitude 2.5 to 4.1 were recorded both before and after the mainshock, indicating an active earthquake sequence.
Most of the seismic activity is concentrated offshore along the Cascadia Subduction Zone, a region known for frequent smaller quakes. Earlier events Sunday included multiple magnitude 3.0+ tremors in rapid succession, suggesting a developing swarm pattern rather than a single isolated event.
There are no reports of damage or injuries, and shaking is unlikely to have been widely felt inland due to the offshore location. Tsunami risk also remains low based on current data.
Seismologists note that aftershock activity is possible in the short term, with a small chance of additional magnitude 3.0+ quakes through the next 24 hours. Residents along the coast should stay aware but no immediate action is required.
