Revision III Maps

Since the maps were submitted to the Building Seismic Safety Council the following additional changes are recommended for future updates of the hazard maps. The December 2008 maps are referred to as Revision II. For Revision III ratio maps visit this page.

Region Spectral Acceleration Probability of Exceedance VS30 Download
Central/Eastern U.S. Peak Ground Acceleration 7% in 75 Years 2,000 m/s PDF (124 kB)
PNG (125 kB)
Central/Eastern U.S. Peak Ground Acceleration 2% in 50 Years 2,000 m/s PDF (134 kB)
PNG (143 kB)
Central/Eastern U.S. 0.1 Second Sa (10.0 Hz) 2% in 50 Years 2,000 m/s PDF (136 kB)
PNG (135 kB)
Central/Eastern U.S. 0.2 Second Sa (5.0 Hz) 2% in 50 Years 2,000 m/s PDF (135 kB)
PNG (129 kB)
Central/Eastern U.S. 0.3 Second Sa (3.33 Hz) 2% in 50 Years 2,000 m/s PDF (133 kB)
PNG (123 kB)
Central/Eastern U.S. 0.5 Second Sa (2 Hz) 2% in 50 Years 2,000 m/s PDF (131 kB)
PNG (130 kB)
Central/Eastern U.S. 1.0 Second Sa (1.0 Hz) 2% in 50 Years 2,000 m/s PDF (130 kB)
PNG (133 kB)
Central/Eastern U.S. 2.0 Second Sa (0.5 Hz) 2% in 50 Years 2,000 m/s PDF (129 kB)
PNG (124 kB)
Western U.S. Peak Ground Acceleration 2% in 50 Years 1,150 m/s PDF (340 kB)
PNG (147 kB)
Western U.S. Peak Ground Acceleration 2% in 50 Years 180 m/s PDF (140 kB)
PNG (150 kB)
Western U.S. Peak Ground Acceleration 10% in 50 Years 180 m/s PDF (141 kB)
PNG (190 kB)
Western U.S. Peak Ground Acceleration 2% in 50 Years 259 m/s PDF (143 kB)
PNG (152 kB)
Western U.S. Peak Ground Acceleration 2% in 50 Years 360 m/s PDF (83 kB)
PNG (143 kB)
Western U.S. Peak Ground Acceleration 2% in 50 Years 537 m/s PDF (139 kB)
PNG (153 kB)
Western U.S. 0.1 Second Sa (10.0 Hz) 2% in 50 Years 1,150 m/s PDF (85 kB)
PNG (145 kB)
Western U.S. 0.1 Second Sa (10.0 Hz) 2% in 50 Years 180 m/s PDF (84 kB)
PNG (141 kB)
Western U.S. 0.1 Second Sa (10.0 Hz) 2% in 50 Years 259 m/s PDF (84 kB)
PNG (142 kB)
Western U.S. 0.1 Second Sa (10.0 Hz) 2% in 50 Years 360 m/s PDF (84 kB)
PNG (143 kB)
Western U.S. 0.1 Second Sa (10.0 Hz) 2% in 50 Years 537 m/s PDF (82 kB)
PNG (141 kB)
Western U.S. 0.2 Second Sa (5.0 Hz) 2% in 50 Years 1,150 m/s PDF (369 kB)
PNG (147 kB)
Western U.S. 0.2 Second Sa (5.0 Hz) 2% in 50 Years 180 m/s PDF (81 kB)
PNG (141 kB)
Western U.S. 0.2 Second Sa (5.0 Hz) 2% in 50 Years 259 m/s PDF (72 kB)
PNG (133 kB)
Western U.S. 0.2 Second Sa (5.0 Hz) 2% in 50 Years 360 m/s PDF (85 kB)
PNG (144 kB)
Western U.S. 0.2 Second Sa (5.0 Hz) 2% in 50 Years 537 m/s PDF (146 kB)
PNG (159 kB)
Western U.S. 0.2 Second Sa (5.0 Hz) 5% in 50 Years 537 m/s PDF (131 kB)
PNG (149 kB)
Western U.S. 0.3 Second Sa (3.33 Hz) 2% in 50 Years 1,150 m/s PDF (367 kB)
PNG (146 kB)
Western U.S. 0.3 Second Sa (3.33 Hz) 5% in 50 Years 1,150 m/s PDF (82 kB)
PNG (140 kB)
Western U.S. 0.3 Second Sa (3.33 Hz) 2% in 50 Years 180 m/s PDF (78 kB)
PNG (137 kB)
Western U.S. 0.3 Second Sa (3.33 Hz) 2% in 50 Years 259 m/s PDF (84 kB)
PNG (143 kB)
Western U.S. 0.3 Second Sa (3.33 Hz) 2% in 50 Years 360 m/s PDF (85 kB)
PNG (144 kB)
Western U.S. 0.3 Second Sa (3.33 Hz) 2% in 50 Years 537 m/s PDF (86 kB)
PNG (142 kB)
Western U.S. 0.5 Second Sa (2 Hz) 2% in 50 Years 1,150 m/s PDF (83 kB)
PNG (141 kB)
Western U.S. 0.5 Second Sa (2 Hz) 2% in 50 Years 180 m/s PDF (79 kB)
PNG (138 kB)
Western U.S. 0.5 Second Sa (2 Hz) 2% in 50 Years 259 m/s PDF (80 kB)
PNG (138 kB)
Western U.S. 0.5 Second Sa (2 Hz) 10% in 50 Years 259 m/s PDF (77 kB)
PNG (134 kB)
Western U.S. 0.5 Second Sa (2 Hz) 2% in 50 Years 360 m/s PDF (85 kB)
PNG (143 kB)
Western U.S. 0.5 Second Sa (2 Hz) 2% in 50 Years 537 m/s PDF (133 kB)
PNG (150 kB)
Western U.S. 0.75 Second Sa (1.33 Hz) 2% in 50 Years 1,150 m/s PDF (84 kB)
PNG (142 kB)
Western U.S. 0.75 Second Sa (1.33 Hz) 5% in 50 Years 1,150 m/s PDF (81 kB)
PNG (137 kB)
Western U.S. 0.75 Second Sa (1.33 Hz) 2% in 50 Years 180 m/s PDF (79 kB)
PNG (139 kB)
Western U.S. 0.75 Second Sa (1.33 Hz) 2% in 50 Years 259 m/s PDF (354 kB)
PNG (136 kB)
Western U.S. 0.75 Second Sa (1.33 Hz) 2% in 50 Years 360 m/s PDF (84 kB)
PNG (140 kB)
Western U.S. 0.75 Second Sa (1.33 Hz) 2% in 50 Years 537 m/s PDF (83 kB)
PNG (135 kB)
Western U.S. 0.75 Second Sa (1.33 Hz) 10% in 50 Years 537 m/s PDF (80 kB)
PNG (129 kB)
Western U.S. 0.75 Second Sa (1.33 Hz) 2% in 50 Years 760 m/s PDF (586 kB)
PNG (152 kB)
Western U.S. 0.75 Second Sa (1.33 Hz) 5% in 50 Years 760 m/s PDF (557 kB)
PNG (147 kB)
Western U.S. 1.0 Second Sa (1.0 Hz) 2% in 50 Years 1,150 m/s PDF (480 kB)
PNG (154 kB)
Western U.S. 1.0 Second Sa (1.0 Hz) 2% in 50 Years 180 m/s PDF (86 kB)
PNG (146 kB)
Western U.S. 1.0 Second Sa (1.0 Hz) 2% in 50 Years 259 m/s PDF (91 kB)
PNG (149 kB)
Western U.S. 1.0 Second Sa (1.0 Hz) 2% in 50 Years 360 m/s PDF (83 kB)
PNG (143 kB)
Western U.S. 1.0 Second Sa (1.0 Hz) 2% in 50 Years 537 m/s PDF (137 kB)
PNG (151 kB)
Western U.S. 2.0 Second Sa (0.5 Hz) 2% in 50 Years 1,150 m/s PDF (358 kB)
PNG (136 kB)
Western U.S. 2.0 Second Sa (0.5 Hz) 2% in 50 Years 180 m/s PDF (87 kB)
PNG (147 kB)
Western U.S. 2.0 Second Sa (0.5 Hz) 2% in 50 Years 259 m/s PDF (88 kB)
PNG (143 kB)
Western U.S. 2.0 Second Sa (0.5 Hz) 2% in 50 Years 360 m/s PDF (81 kB)
PNG (139 kB)
Western U.S. 2.0 Second Sa (0.5 Hz) 2% in 50 Years 537 m/s PDF (81 kB)
PNG (135 kB)
Western U.S. 3.0 Second Sa (0.33 Hz) 2% in 50 Years 1,150 m/s PDF (77 kB)
PNG (131 kB)
Western U.S. 3.0 Second Sa (0.33 Hz) 2% in 50 Years 180 m/s PDF (84 kB)
PNG (142 kB)
Western U.S. 3.0 Second Sa (0.33 Hz) 2% in 50 Years 259 m/s PDF (80 kB)
PNG (136 kB)
Western U.S. 3.0 Second Sa (0.33 Hz) 2% in 50 Years 360 m/s PDF (81 kB)
PNG (136 kB)
Western U.S. 3.0 Second Sa (0.33 Hz) 2% in 50 Years 537 m/s PDF (72 kB)
PNG (122 kB)
Western U.S. 3.0 Second Sa (0.33 Hz) 5% in 50 Years 760 m/s PDF (394 kB)
PNG (131 kB)
Western U.S. 4.0 Second Sa (0.25 Hz) 2% in 50 Years 1,150 m/s PDF (76 kB)
PNG (127 kB)
Western U.S. 4.0 Second Sa (0.25 Hz) 2% in 50 Years 180 m/s PDF (80 kB)
PNG (138 kB)
Western U.S. 4.0 Second Sa (0.25 Hz) 2% in 50 Years 259 m/s PDF (354 kB)
PNG (135 kB)
Western U.S. 4.0 Second Sa (0.25 Hz) 2% in 50 Years 360 m/s PDF (82 kB)
PNG (138 kB)
Western U.S. 4.0 Second Sa (0.25 Hz) 2% in 50 Years 537 m/s PDF (78 kB)
PNG (132 kB)
Western U.S. 4.0 Second Sa (0.25 Hz) 2% in 50 Years 760 m/s PDF (638 kB)
PNG (140 kB)
Western U.S. 4.0 Second Sa (0.25 Hz) 5% in 50 Years 760 m/s PDF (129 kB)
PNG (140 kB)
Western U.S. 5.0 Second Sa (0.2 Hz) 2% in 50 Years 1,150 m/s PDF (75 kB)
PNG (125 kB)
Western U.S. 5.0 Second Sa (0.2 Hz) 2% in 50 Years 180 m/s PDF (80 kB)
PNG (136 kB)
Western U.S. 5.0 Second Sa (0.2 Hz) 2% in 50 Years 259 m/s PDF (82 kB)
PNG (136 kB)
Western U.S. 5.0 Second Sa (0.2 Hz) 10% in 50 Years 259 m/s PDF (76 kB)
PNG (123 kB)
Western U.S. 5.0 Second Sa (0.2 Hz) 2% in 50 Years 360 m/s PDF (81 kB)
PNG (134 kB)
Western U.S. 5.0 Second Sa (0.2 Hz) 2% in 50 Years 537 m/s PDF (89 kB)
PNG (146 kB)
Western U.S. 5.0 Second Sa (0.2 Hz) 2% in 50 Years 760 m/s PDF (342 kB)
PNG (132 kB)
Western U.S. 5.0 Second Sa (0.2 Hz) 5% in 50 Years 760 m/s PDF (372 kB)
PNG (128 kB)
Western U.S. Peak Ground Velocity 2% in 50 Years 259 m/s PDF (82 kB)
PNG (136 kB)
Western U.S. Peak Ground Velocity 2% in 50 Years 360 m/s PDF (83 kB)
PNG (140 kB)
Western U.S. Peak Ground Velocity 2% in 50 Years 537 m/s PDF (83 kB)
PNG (135 kB)