According to data on a map posted by the network, most were below a magnitude 2.0. The largest may have been a magnitude 2.9 on the north end of the swarm at 8:22 p.m. Sunday.

More than 100 small earthquakes have been recorded since Saturday about 30 miles northwest of the Tri-Cities on the edge of the Hanford Reach National Monument, according to the Pacific Northwest ...

According to a map posted by the network, most were below a magnitude 2.0. The largest may have been a magnitude 2.9 on the north end of the swarm at 8:22 p.m. Sunday.

According to data on a map posted by the network, most were below a magnitude 2.0. The largest may have been a magnitude 2.9 on the north end of the swarm at 8:22 p.m. Sunday.