Seismicity of the United States

Earthquakes represented are:
• M5.5+ 1900 - 2002
• M3.5+ 1990-2008 US - lower 48 and Hawaii
• M4.5+ 1990-2009 Alaska

Map data sources for earthquakes:
• Engdahl, E.R., and Villaseñor, Antonio, 2002, Global seismicity 1900-1999, in Lee, W.H.K., Jennings, P., Kisslinger, C., and Kanamori, H., eds, International Handbook of Earthquake and Engineering Seismology, v. 81(A), chap. 41, p. 1-26.
• Also from the USGS/NEICPDE catalog

Basemap:
• GEBCO, 2008, The GEBCO_08_Grid, ver. 20091120, http://www.gebco.net/, last accessed January 8, 2010.
• Siebert, L., and Simkin, T., 2002, Volcanoes of the world: An illustrated catalog of Holocene volcanoes and their eruptions: Smithsonian Institution, Global Volcanism Program Digital Information series, GVP-3, http://www.volcano.si.edu/world/, last accessed January 9, 2007.

Author: Susan Rhea