Research: most recent U.S. earthquakes are likely man-made

In the past decade there has been a remarkable increase in earthquake activity in the U.S.A. A U.S. Geological Survey research team says that these earthquakes are "almost certainly man-made."

Researchers for the U.S. Geological Survey have presented a study which states that natural gas and oil extraction activity has most likely provoked the series of recent earthquakes in the U.S.A, from Alabama through to the Northern Rocky Mountains.

They have not yet estimated a direct cause-effect relationship between gas and oil activity and earthquakes.... read full article.