If you’ve felt an earthquake in Texas at any point over the last four decades, odds are that quake wasn’t naturally occurring, but was caused by oil and gas industry activities, according to a newly published scientific report. Just 13 percent of Texas earthquakes larger than magnitude 3 since 1975 were the result of natural causes alone, according to scientists from the University of Texas who published their peer-reviewed paper in the journal Seismological Research Letters . In recent years, fracking wastewater injection wells have become the primary cause of tremblors in the state, the report adds. And it’s not simply a modern phenomenon, the researchers found. In fact, so-called induced earthquakes, or those caused by human activities, date all the way back to the 1920’s. “The record clearly demonstrates that induced earthquakes have been broadly distributed in several different geographic parts of Texas over the last 90 years,” […]