Wald, David Jay, Vincent Quitoriano, Charles Bruce Worden, Margaret Hopper, and James W. Dewey. “USGS ‘Did You Feel It?’ Internet-Based Macroseismic Intensity Maps”. Annals of Geophysics 54, no. 6 (January 14, 2012). Accessed May 4, 2024. https://www.annalsofgeophysics.eu/index.php/annals/article/view/5354.