Is the recent sequence of earthquakes near Youngstown, Ohio, related to the wastewater disposal activities there?

There is a credible connection between the wastewater injection activities near Youngstown and the recent earthquakes, including the magnitude 4 earthquake that occurred on New Year’s Eve, 2011. This connection is based on the close proximity of the earthquakes to the injection well and depth of injection, and the observation that these events began soon after the start of the injection activities.