USGS geophysicist Jana Pursley says the temblors began about 1:45 a.m. Tuesday and all were centered northeast of Oklahoma City. She says the strongest was a magnitude 4.3 quake centered near the town of Luther.
Pursley says all the quakes were shallow, which is common for the area. She also says it is common for several earthquakes or aftershocks to strike during a short period of time.
The USGS says another 4.2-magnitude earthquake struck at about 5:15 a.m. Tuesday. That earthquake was centered about 5 miles east-northeast of Luther.
An official answering the dispatch line for the Oklahoma County Sheriff's office says they have received no reports of damage or injuries.