Very unusual: Four earthquakes shake Nebraska in two days

A very unusual seismic phenomenon is currently taking place in Nebraska. There were 4 earthquakes in central Nebraska on April 9th and 10th. The first one, with a magnitude of 3.3 shook near Arnold, Nebraska Monday morning, at 4:33. The next quake held off until Tuesday morning, starting at 6:41, hitting with a magnitude of 3.7. Just over 10 minutes later, a weaker 2.5 magnitude earthquake struck nearby. Later in the morning, a 3.3 magnitude earthquake hit in the same general area at 10:49.