The following maps may be viewed, downloaded and printed in GIF and PDF formats.

Figure E1. Location of the attenuation boundary between east and west. The Boore-Joyner attenuation (1982) is used for all sources west of the boundary except for the Pacific northwest. In the Pacific northwest, the Youngs and Coppersmith (1989) attenuation is used for the Cascadia subduction zone and intraplate earthquakes. However, the Joyner-Boore (1982) attenuation is used for shallow earthquakes in the Pacific northwest. GIF, 15kb; PDF, 138kb

The following maps are available in GIF format only!

Figure E2. Pacific Northwest and Rocky Mountain region source zones with those areas that were also modeled using line sources, shown as shaded areas. From Hanson and Perkins (1995). GIF, 29kb

Figure E3. California source zones, with those shaded areas in which line sources were used to model finite ruptures for larger magnitude earthquakes. From Hanson and Perkins (1995). GIF, 24kb

Figure E4. Central and Eastern U.S. source zones, with those areas that were also modeled using line sources shown as shaded areas. From Hanson and Perkins (1995). GIF, 18kb