The latest in a series of minor earthquakes in northeast Ohio hit on Saturday, this time reaching a magnitude of 4.0 on the Richter scale.

The tremor sent some stunned residents running for cover as bookshelves shook and pictures and lamps fell from tables.

The quake struck Saturday afternoon in McDonald, outside of Youngstown, the U.S. Geological Survey said.

The area has experienced at least 10 minor quakes in 2011, though Saturday's temblor was stronger than others, which generally had a magnitude of 2.7 or lower.
This time, some residents reported feeling trembling farther south into Columbiana County and east into western Pennsylvania.

Many of the quakes have struck near an injection well used to dispose of brine water that is a byproduct of oil and gas drilling. Thousands of gallons of brine are injected into the well daily, and much of it is shipped in from out of state.

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