Figure 1, Chapter 1, J.W. Horton et al. (IMAGE) Geological Society of America Caption This is a map showing the epicenters of earthquakes in eastern North America having moment magnitude (Mw) 5.8 and greater. Credit J.W. Horton et al., GSA Special Paper 509 Usage Restrictions Credit J.W. Horton et al., GSA Special Paper 509 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.