Trench Across the Fault (IMAGE) Arizona State University Caption Dr. Olaf Zielke and Professor J. Ramon Arrowsmith of Arizona State University stand in the bottom of a trench across the San Andreas fault zone in the Carrizo Plain and discuss the exposures of faulted sediments and channel gravel visible in the walls. Credit Bidart Fan San Andreas fault research team, University of California Irvine and Arizona State University Usage Restrictions None 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.