KINGFISHER, Okla. (AP) — No injuries or damage have been reported following a small earthquake in central Oklahoma, the fourth such earthquake in the area in less than three weeks.
The U.S. Geological Survey says a magnitude 3.1 temblor was recorded at 4:39 a.m. Thursday near Kingfisher, about 40 miles (64 kilometers) northwest of Oklahoma City.
A 3.1 magnitude quake and two 2.6 magnitude quakes were recorded in the same area, all on July 9.
Thousands of earthquakes in Oklahoma in recent years have been linked to the underground injection of wastewater from oil and gas production. The USGS reports the number of magnitude 3.0 or greater earthquakes is on pace to decline for the fourth straight year after state regulators began directing producers to close some wells and reduce volumes in others.