New Research (IMAGE) Geological Society of America Caption New research suggests that earthquakes on some faults can occur in clusters and that the associated hazard depends in large part upon how much strain was released during earlier tremors. Credit Seth Stein Usage Restrictions Credit: Seth Stein. 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.