APPENDIX A: USGS PEAK GROUND MOTION MAPS AND MAPS IN BUILDING CODE AND RELATED DOCUMENTS

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

Figure A1. 1976 Contour map for peak horizontal acceleration (expressed as percent of gravity) in rock with 90 percent probability of not being exceeded in 50 years. The maximum acceleration within the 60 percent contour along the San Andreas and Garlock faults in California is 80 percent of gravity. After Algermissen and Perkins, 1976. GIF, 27kb; PDF, 531kb

Figure A2. Contour map for effective peak acceleration (EPA) coefficient, Aa, for the continental United States. The units of EPA are expressed as a percent of gravity. After BSSC, 1995 (This map was redrawn from the original source, if differences occur, the original source should be used). GIF, 26kb; PDF, 465kb

Figure A3. Contour map for effective peak velocity-related acceleration (EPV) coefficient, Av, for the continental United States. The units of EPV are expressed as a percent of gravity. After BSSC, 1995 (This map was redrawn from the original source, if differences occur, the original source should be used). GIF, 26kb; PDF, 489kb

Figure A4. One of the SEAOC Seismology Committee proposals for the 1988 Uniform Building Code zone map. Zones are identified by the numbers from 0 to 4. Seismic zone factors are assigned to each zone; Zone 0 = 0, Zone 1 = 0.1, Zone 2 = 0.20 (= 0.15 for Zone 2 east of the continental divide), Zone 3 = 0.3, and Zone 4 = 0.4. Each zone also has specific structural detailing requirements. After ICBO, 1986 (This map was redrawn from the original source, if differences occur, the original source should be used). GIF, 27kb; PDF, 418kb

Figure A5. 1988 Uniform Building Code zone map. Zones are identified by the numbers from 0 to 4. Seismic zone factors are assigned to each zone; Zone 0 = 0, Zone 1 = 0.075, Zone 2A = 0.15, Zone 2B = 0.20, Zone 3 = 0.3, and Zone 4 = 0.4. Each zone also has specific structural detailing requirements. After ICBO, 1988 (This map was redrawn from the original source, if differences occur, the original source should be used). GIF, 26kb; PDF, 440kb

Figure A6. 1990 Contour map for peak horizontal acceleration (expressed as percent of gravity) in rock with 90 percent probability of not being exceeded in 50 years. After Algermissen et al, 1990. GIF, 29kb; PDF, 842kb

Figure A7. 1994 Uniform Building Code zone map. Zones are identified by the numbers from 0 to 4. Seismic zone factors are assigned to each zone; Zone 0 = 0, Zone 1 = 0.075, Zone 2A = 0.15, Zone 2B = 0.20, Zone 3 = 0.3, and Zone 4 = 0.4. Each zone also has specific structural detailing requirements. After ICBO, 1994 (This map was redrawn from the original source, if differences occur, the original source should be used). GIF, 26kb; PDF, 435kb

Figure A8. ASCE A7 contour map for effective peak acceleration (EPA) coefficient Aa, for the continental United States. The units of EPA are expressed as a percent of gravity. After ASCE, 1994 (This map was redrawn from the original source, if differences occur, the original source should be used). GIF, 26kb; PDF, 470kb

Figure A9. ASCE A7 contour map for effective peak velocity-related acceleration (EPV) coefficient, Av, for the continental United States. The units of EPV are expressed as a percent of gravity. After ASCE, 1994 (This map has been redrawn from the original source, if differences occur, the original source should be used). GIF, 26kb; PDF, 464kb