After reviewing the data the United States Geological Survey has revised information on a Sunday afternoon earthquake in Trumbull county.

The initial report by the USGS placed the center of the 1.8 magnitude quake about a mile from an injection well site on Route 169. The new data says the quake was centered adjacent to the well site and the magnitude was slightly higher at 2.1.

There are four remote seismic monitors surrounding the site and a spokesperson for the Ohio Department of Natural Resources says the data is being reviewed. A statement issued Tuesday reads in part.."The review of this data will allow ODNR to determine if any correlation can be made and whether or not any regulatory action is necessary."

Because of increased oil and gas exploration there is more monitoring of seismic activity. "Perhaps because we have more seismic monitors in the area now we are detecting low magnitude activity that went un-noticed before" said Bill Klingle, President of American Water Management Services which operates the injection wells.

The National Earthquake Information Center says that the Sunday quake was picked up by 49 seismic monitors. There are estimated 1-point-3 million earthquakes annually of 2.1 magnitude or smaller. YSU geology professor Ray Beiersdorfer says what is unusual is the Mahoning valley recording more than 100 earthquakes in just the past three years.

"But here in northeast Ohio prior to all this development we weren't a seismically active place and that's one of my concerns" Beiersdorfer said.

Trucks are still making deliveries at the wells and ODNR did not give a timetable for a follow up on it's data review.