Wald, D.J., Quitoriano, V., Worden, C.B., Hopper, M. and Dewey, J.W. 2012. USGS “Did You Feel It?” Internet-based macroseismic intensity maps. Annals of Geophysics. 54, 6 (Jan. 2012). DOI:https://doi.org/10.4401/ag-5354.