Slip Cartoon (IMAGE) Penn State Caption This illustration shows how different materials behave when a fault slips. Credit Cristiano Collettini, Universita degli Studi di Perugia, Italy Usage Restrictions Non Commercial uses only License Licensed content 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.