This image shows the North American component of the World Stress Map project. The symbols at each location represent tectonic stresses, and the various methods used to determine each value. For a more detailed description of each symbol and its definition, please follow the "Symbology" link below (offsite link)

Explanation of Symbology (World Stress Map website)

ArcMap Shapefile Downloads: [Stress Symbology 1.0mb .zip] [Quality Symbology 1.0mb .zip]

Direct Data download: Excel .dbf file

Only modified to convert Quality Ranking from A,B,C to 1,2,3 (for ease in plotting)

Reinecker, J., Heidbach, O. and Mueller, B. (2003): The 2003 release of the World Stress Map

(available online at http://www.world-stress-map.org)