Injection and Rupture (image) California Institute of Technology Share Print E-Mail Caption Wastewater injected in an underground reservoir layer crossed by a fault triggers an earthquake. The earthquake rupture grows larger than the zone pressurized by water injection. Credit Galis et al., and Thomas Willard/Caltech Graphic Resources Usage Restrictions For use in news stories only 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.