The strongest in a series of ten minor earthquakes hit central Oklahoma on Sunday night, according to seismologists. 
 
 The quake was initially measured at magnitude 4.2 but was later downgraded to a 3.8, the U.S. Geological Survey said. 
 
 It was followed by three aftershocks between magnitude 3.0 and 2.7, taking the total number of earthquakes in the area to 10 since Friday. 
 
 The strongest of these quakes hit at 11 p.m. Sunday (midnight ET) about 7 miles southwest of Guthrie, a city of 10,000 people about 30 miles north of Oklahoma City. 
 
 The quake is in the "minor" category, according to the U.S.G.S., and was not strong in comparison to those felt in areas more used to tremors. 
 
 However, it was enough to shake buildings and Jeremiah Jacques, a writer from Edmond, Okla., tweeted a picture taken at his home just south of the quake's epicenter. 

 Loud, booming earthquakes continue to rattle homes and nerves across Oklahoma on an almost daily basis, according to the Oklahoma Geological Survey. 
 
 Click here to watch the report 
 
 The agency tracking seismic activity in Oklahoma reported more than 20 quakes Saturday. The United States Geological Survey, the national agency that reports on the largest quakes in country and abroad, reported a 3.5-magnitude quake Saturday in the Edmond area. 
 
 Many of the quakes in the latest swarm are centered near Liberty Lake in Logan County. 
 
 Nancy York lives in the area. Her tile floor, her ceiling and her walls were all damaged. She said the new cracks in her newly built home were caused by the constant quakes. Not only did York feel eight tremblers Friday, she heard them. 
 
 “Felt like bombs going off. It's just a huge loud noise and then it's like a reverb from that boom that just shakes the entire house,” York said. 
 
 “When you are on top of a small earthquake it generates a boom. It’s kind of similar to an explosion,” said seismologist Austin Holland with OGS. 
 
 Holland said P waves, or sound waves, travel from deep in the earth before erupting at the surface. Although the sound can be powerful, shaking can be minimal. 
 
 “I know these booms have been reported in other places and they couldn't figure out what was going on. The earthquakes were actually too small to detect,” Holland said. 
 
 There have been reports of unexplained booms in Indiana, South Carolina, Ohio, Rhode Island and Oklahoma in the last month. All are close to active areas on the USGS seismic hazard map. 
 
 “We have a lot of pre-existing faults in Oklahoma,” Holland said. 
 
 It appears the faults have become more active. 
 
 Since January 2009, more than 200 magnitude 3.0 or greater earthquakes have rattled central Oklahoma, marking a significant rise in the frequency of these seismic events, according to a joint statement by both USGS and OGS. 
 
 Studies show one to three magnitude 3.0 earthquakes or larger occurred yearly from 1975 to 2008, while the average grew to around 40 earthquakes per year from 2009 to mid-2013. 
 
 Holland said the increase in frequency of earthquakes could just be a natural occurrence or it could be triggered by human activity. 
 
 “We've looked at hydraulic fracturing,” he said. 
 
 He said changing lake levels may be playing some role as well. All possible factors are being looked at. 
 
 The USGS and OGS are currently conducting collaborative research quantifying the changes in earthquake rate in the Oklahoma City region. 
 
 “If I’m experiencing eight of these in one day, then when does it erupt and become absolutely horrible that takes my house down?” York asked. 
 
 “We have no way to predict the future. Earthquakes aren’t predictable. Certainly the more earthquakes we have, the more likely we are to have a larger one,” Holland said. 
 
 This week, a program for non-scientists who want to know more about earthquake hazards and earthquake risks in the central and eastern United States will be held in Washington, D.C. Click here for more information.
– Last night saw a 3.8 earthquake hit central Oklahoma, according to the US Geological Survey—one of 10 to hit the area since Friday, NBC News reports. The 3.8 quake was the most powerful of the minor quakes; it struck near the town of Guthrie, which is about 30 miles north of Oklahoma City. Its aftershocks ranged from 2.7 to 3.0. The area is a hotbed of seismic activity: It's seen more than 200 earthquakes of magnitude 3.0 or higher since January 2009, officials say, per KOCO. What's notable is the change: There were just one to three per year between 1975 and 2008. Whether the difference is due to human or natural activity is unclear, says an expert. Either way, locals have been getting worried over frequent booming sounds. "If I’m experiencing eight of these in one day, then when does it erupt and become absolutely horrible that takes my house down?" asks one resident.