Study: Fracking Causing Strong Oklahoma Quakes
What is significant here is that this is from an industrial trade newsletter
http://www.manufacturing.net/news/2015/10/study-fracking-causing-strong-oklahoma-quakes
The research shows that between 1880 and 2008, there were about 25 quakes of 3.5-magnitude or greater in Oklahoma. From 2008-2014, there were roughly 154 of the same strength. That includes the largest recorded earthquake in state history, a 5.6 earthquake centered near the town of Prague in 2011. Some researchers have put its magnitude as high as 5.7
Data on wastewater volumes associated with oil and gas production is not readily available prior to the mid-1990s. However, the volume of injection wastewater produced amounted to around 70 million barrels per month in 1996, Hough said. By 2013, that figure had more than doubled to around 150 million barrels of wastewater produced a month, she said.
The study relied on Library of Congress data and drill permit records from the Oklahoma Corporation Commission to track how wastewater injection practices evolved in a state where oil production has been going on for more than a century.
The paper's suggestions were disputed Wednesday by a leading energy industry organization.
