Four more earthquakes struck Oklahoma on Monday, including one of magnitude 4.7.

That’s according to the United States Geological Survey’s earthquake data.

The magnitude 4.7 earthquake came at 3:49 a.m. Central Time, the USGS said. It was about five kilometers below the earth’s surface and was centered near Medford, close to the Kansas border.

The Associated Press said there were no immediate accounts of damage, but KWTV News 9 reported the quake was felt across Oklahoma and it shook some of the state’s residents awake.

The Tulsa World reported this morning’s earthquake tied for the largest one in the state since 2011. It was matched only by a magnitude 4.7 earthquake located near Cherokee on Nov. 19.

A trio of smaller earthquakes followed.

A magnitude 3.0 quake occurred at 5:50 a.m. near Edmond, according to the USGS. An hour later, there were magnitude 3.1 and 2.7 earthquakes within 40 minutes of each other near Perry.

More than 5,000 earthquakes have already been recorded in Oklahoma this year, according to NPR. The oil and gas industries in Oklahoma produce a lot of wastewater, which the USGS has linked to the rise in earthquakes. State officials have introduced measures to limit wastewater.

Oklahoma is a key component of the energy scene in the United States.

It houses what an NPR report called North America’s largest commercial crude oil storage center, holding approximately 54 million barrels of oil in tanks the size of airplane hangars.

The facility is located in Cushing. While an official told NPR that the Oklahoma quakes have not caused any issues yet, the tanks weren’t constructed with any kind of major earthquake in mind.

That’s because the swarm in earthquakes is a recent phenomenon.

The number of earthquakes began to trend upward in 2009, and a USGS report found a 50 percent increase in the state’s earthquake rate from October 2013 to its May 2014 publication.

The report also said that raised the odds that a magnitude 5.5 quake would hit Oklahoma. A magnitude 5.6 quake hit Prague in November 2011, which is the state’s biggest quake on record.

A USGS research geophysicist told NPR he’s spoken to the Department of Homeland Security about the Cushing oil tanks. NPR also reported that officials fear that any earthquake damage to the Cushing facility could have significant implications in the United States energy market.