Hundreds of people reported feeling small earthquakes of similar intensity on Hawaii's Big Island and on the Olympic Peninsula northwest of Seattle, but no damage was reported.
The earthquakes that struck Saturday afternoon in Hawaii and Sunday morning in Washington state were more than 2,600 miles apart and apparently unrelated.
A magnitude 4.1 earthquake struck nine miles (14 kilometers) southwest of the volcano off the southeastern coast of Hawaii island on Saturday around 4:30 p.m.
According to the National Weather Service's Tsunami Warning System, the quake was too small to cause a tsunami.
However, dozens reported feeling this through the US Geological Survey. The earthquake occurred in the area of Kilauea, a volcano that erupted for several weeks before calming down in September.
Shortly after 7 a.m. Sunday, dozens more people in the Puget Sound area reported feeling a magnitude 4.0 earthquake centered on the northeast Olympic Peninsula, 25 miles (40 kilometers) northwest of Seattle.
A magnitude 4.0 earthquake is powerful enough to wake people and rattle cars and signs, but won't cause damage, according to the Geological Survey.