Triggered Earthquakes in Oklahoma (image) Stanford's School of Earth, Energy & Environmental Sciences Share Print E-Mail Caption Large volumes of highly saline water extracted along with oil and gas from some producing formations gets injected into a deep disposal zone, the Arbuckle Formation, which sits directly upon crystalline basement rocks. Rising pore pressure in the Arbuckle Formation can penetrate already-stressed basement faults and trigger earthquakes. Credit Steven Than/Stanford University Usage Restrictions The image may only be used with appropriate caption or credit. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.