The maps presented on this page represent ratio maps comparing different assumptions about soil conditions.

Region Spectral Acceleration Probability of Exceedance VS30 Download
Western U.S. Peak Ground Acceleration 2% in 50 Years 1,150 m/s over 760 m/s PDF (571 kB)
PNG (229 kB)
Western U.S. Peak Ground Acceleration 2% in 50 Years 180 m/s over 259 m/s PDF (390 kB)
PNG (158 kB)
Western U.S. Peak Ground Acceleration 2% in 50 Years 259 m/s over 360 m/s PDF (84 kB)
PNG (184 kB)
Western U.S. Peak Ground Acceleration 2% in 50 Years 259 m/s over 760 m/s PDF (88 kB)
PNG (265 kB)
Western U.S. Peak Ground Acceleration 2% in 50 Years 537 m/s over 360 m/s PDF (71 kB)
PNG (129 kB)
Western U.S. Peak Ground Acceleration 2% in 50 Years 537 m/s over 760 m/s PDF (83 kB)
PNG (136 kB)
Western U.S. 0.1 Second Sa (10.0 Hz) 2% in 50 Years 1,150 m/s over 760 m/s PDF (72 kB)
PNG (132 kB)
Western U.S. 0.1 Second Sa (10.0 Hz) 2% in 50 Years 180 m/s over 259 m/s PDF (88 kB)
PNG (172 kB)
Western U.S. 0.1 Second Sa (10.0 Hz) 2% in 50 Years 259 m/s over 360 m/s PDF (88 kB)
PNG (163 kB)
Western U.S. 0.2 Second Sa (5.0 Hz) 2% in 50 Years 1,150 m/s over 760 m/s PDF (661 kB)
PNG (277 kB)
Western U.S. 0.2 Second Sa (5.0 Hz) 2% in 50 Years 180 m/s over 259 m/s PDF (89 kB)
PNG (167 kB)
Western U.S. 0.2 Second Sa (5.0 Hz) 2% in 50 Years 259 m/s over 360 m/s PDF (87 kB)
PNG (175 kB)
Western U.S. 0.2 Second Sa (5.0 Hz) 2% in 50 Years 259 m/s over 760 m/s PDF (91 kB)
PNG (273 kB)
Western U.S. 0.2 Second Sa (5.0 Hz) 2% in 50 Years 537 m/s over 760 m/s PDF (84 kB)
PNG (209 kB)
Western U.S. 0.3 Second Sa (3.33 Hz) 2% in 50 Years 1,150 m/s over 760 m/s PDF (674 kB)
PNG (255 kB)
Western U.S. 0.3 Second Sa (3.33 Hz) 2% in 50 Years 180 m/s over 259 m/s PDF (391 kB)
PNG (162 kB)
Western U.S. 0.5 Second Sa (2 Hz) 2% in 50 Years 180 m/s over 259 m/s PDF (90 kB)
PNG (159 kB)
Western U.S. 0.5 Second Sa (2 Hz) 2% in 50 Years 259 m/s over 360 m/s PDF (80 kB)
PNG (220 kB)
Western U.S. 0.5 Second Sa (2 Hz) 2% in 50 Years 537 m/s over 360 m/s PDF (74 kB)
PNG (189 kB)
Western U.S. 0.75 Second Sa (1.33 Hz) 2% in 50 Years 1,150 m/s over 760 m/s PDF (72 kB)
PNG (132 kB)
Western U.S. 0.75 Second Sa (1.33 Hz) 2% in 50 Years 180 m/s over 259 m/s PDF (85 kB)
PNG (150 kB)
Western U.S. 1.0 Second Sa (1.0 Hz) 2% in 50 Years 1,150 m/s over 760 m/s PDF (657 kB)
PNG (237 kB)
Western U.S. 1.0 Second Sa (1.0 Hz) 2% in 50 Years 180 m/s over 259 m/s PDF (130 kB)
PNG (204 kB)
Western U.S. 1.0 Second Sa (1.0 Hz) 2% in 50 Years 259 m/s over 360 m/s PDF (74 kB)
PNG (214 kB)
Western U.S. 1.0 Second Sa (1.0 Hz) 2% in 50 Years 259 m/s over 760 m/s PDF (83 kB)
PNG (193 kB)
Western U.S. 1.0 Second Sa (1.0 Hz) 2% in 50 Years 537 m/s over 360 m/s PDF (76 kB)
PNG (165 kB)
Western U.S. 1.0 Second Sa (1.0 Hz) 2% in 50 Years 537 m/s over 760 m/s PDF (79 kB)
PNG (151 kB)
Western U.S. 2.0 Second Sa (0.5 Hz) 2% in 50 Years 1,150 m/s over 760 m/s PDF (726 kB)
PNG (285 kB)
Western U.S. 2.0 Second Sa (0.5 Hz) 2% in 50 Years 180 m/s over 259 m/s PDF (80 kB)
PNG (182 kB)
Western U.S. 2.0 Second Sa (0.5 Hz) 2% in 50 Years 537 m/s over 360 m/s PDF (68 kB)
PNG (182 kB)
Western U.S. 2.0 Second Sa (0.5 Hz) 2% in 50 Years 537 m/s over 760 m/s PDF (72 kB)
PNG (196 kB)
Western U.S. 3.0 Second Sa (0.33 Hz) 2% in 50 Years 259 m/s over 760 m/s PDF (74 kB)
PNG (215 kB)
Western U.S. 4.0 Second Sa (0.25 Hz) 2% in 50 Years 1,150 m/s over 760 m/s PDF (74 kB)
PNG (135 kB)
Western U.S. 4.0 Second Sa (0.25 Hz) 2% in 50 Years 537 m/s over 360 m/s PDF (78 kB)
PNG (172 kB)
Western U.S. 4.0 Second Sa (0.25 Hz) 2% in 50 Years 537 m/s over 760 m/s PDF (83 kB)
PNG (181 kB)