State environmental officials say an earthquake struck Allegheny Township last month, but it was so small it’s likely no one but seismologists noticed.
On Oct. 4, the Pennsylvania Department of Environmental Protection (DEP) was alerted to a seismic event near EQT’s Porter well pad in Allegheny Township off Willowbrook Road.
At about 5 a.m., an earthquake registered a magnitude of 0.5 on the Richter scale. An event of that magnitude would be too small to be felt by people in the area but was large enough to alert DEP to unusual seismic activity…