A series of small earthquakes has struck near Richland and West Richland.
The largest quake, a 3.7-magnitude temblor, was felt by residents but police said there were no reports of any injuries or damages.
The U.S. Geological Survey said the quake struck at 9:13 p.m. Saturday and was centered about nine miles north of the city.
Richland police Sgt. Curtis Smith said a few people called to say they felt the rattling, The Associated Press reported.
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A USGS website that records local reactions to quakes had more than two dozen responses from Richland.
There were eight micro earthquakes, ranging in magnitude from 1.0 to 2.3, recorded Saturday night in the same general areas north of Richland or northeast of West Richland, according to the Pacific Northwest Seismograph Network.
Two small quakes also were recorded Sunday morning, a 2.1-magnitude at 4:28 a.m., and a 2.3-magnitude at 10:54 a.m.