HAYWARD, Okla. (AP) -- Officials say there are no reports of damage after a 4.2 magnitude earthquake struck northern Oklahoma on Tuesday morning.
The U.S. Geological Survey says the quake was centered near Hayward, or about 50 miles (80 kilometers) north of Oklahoma City. It had a preliminary magnitude of 4.4 that was later revised down to 4.2.
A day earlier, a 3.6 magnitude earthquake also struck northern Oklahoma, but no damage was reported.
Thousands of earthquakes recorded in Oklahoma in recent years have been linked to the underground injection of wastewater from oil and gas production.
Geologists say about 200 quakes of magnitude 3.0 or stronger were recorded in Oklahoma last year, the third year of declines since regulators began directing producers to close some wells and reduce injection volumes.
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