Derived from 2008 USGS Hazard Data
2012 IBC
These gridded text files contain S_{S} and S_{1} parameter values from the 2012 International Building Code. Please note that these values will not exactly match those provided by the U.S. Seismic Design Maps. The maps interpolate the underlying probabilistic and deterministic ground motions, as well as the risk coefficients, before calculating S_{S} and S_{1}. Should you choose to interpolate the gridded values provided below, you will be doing so after the S_{S} and S_{1} calculations have already been performed at the grid points. Proceeding with this order of operations will produce results that slightly differ from those calculated in the Design Maps. The data below are provided as a reference. For the specific gridded data sets underlying the Design Maps, which can be used to recreate the Design Maps, please consult the 2009 NEHRP Recommended Seismic Provisions data section.

Conterminous US
0.2 s and 1.0 s RiskTargeted MCE (MCE_{R}) Ground Motions
(0.01° gridded data, 24.6°50° N, 125°65° W)
 [Download as Text (112 MB)]

0.2 s and 1.0 s RiskTargeted MCE (MCE_{R}) Ground Motions
(Short Reference Version: 0.05° gridded data,
24.6°50° N, 125°65° W)
 [Download as Text (25 MB)]

Alaska
0.2 s and 1.0 s RiskTargeted MCE (MCE_{R}) Ground Motions
(0.05° gridded data, 48°72° N, 160° E 
125.1° W)
 [Download as Text (30 MB)]

Hawaii
0.2 s and 1.0 s RiskTargeted MCE (MCE_{R}) Ground Motions
(0.02° gridded data, 18°23° N, 161°154° W)
 [Download as Text (3 MB)]

Puerto Rico/U.S. Virgin Islands
0.2 s and 1.0 s RiskTargeted MCE (MCE_{R}) Ground Motions
(0.01° gridded data, 17.5°19° N,
67.5°64.5° W)
 [Download as Text (1 MB)]
ASCE 710
These gridded text files contain S_{S}, S_{1}, PGA, C_{RS}, and C_{R1} parameter values from the 2010 ASCE 7 Standard. Please note that these values will not exactly match those provided by the U.S. Seismic Design Maps. The Maps interpolate the underlying probabilistic and deterministic ground motions, as well as the risk coefficients, before calculating S_{S} and S_{1}. Should you choose to interpolate the gridded values provided below, you will be doing so after the S_{S} and S_{1} calculations have already been performed at the grid points. Proceeding with this order of operations will produce results that slightly differ from those calculated by the Design Maps. The data below are provided as a reference. For the specific gridded data sets underlying the Design Maps, which can be used to recreate the Design Maps results, please consult the 2009 NEHRP Recommended Seismic Provisions data section on this page.

Conterminous US
0.2 s and 1.0 s RiskTargeted MCE (MCE_{R}) and Geometric
Mean PGA (MCE_{G}) Ground Motions (0.05° gridded
data, 24.6°50° N, 125°65° W)
 [Download as Text (25 MB)]

0.2 s Risk Coefficient (0.01° gridded data, 24.6°50°
N, 125°65° W)
 [Download as Text (349 MB)]

1.0 s Risk Coefficient (0.01° gridded data, 24.6°50°
N, 125°65° W)
 [Download as Text (349 MB)]

Alaska
0.2 s and 1.0 s RiskTargeted MCE (MCE_{R}) and Geometric
Mean PGA (MCE_{G}) Ground Motions (0.05° gridded
data, 48°72° N, 160° E  125.1° W)
 [Download as Text (30 MB)]

0.2 s Risk Coefficient (0.05° gridded data, 48°72° N,
160° E  125.1° W)
 [Download as Text (16 MB)]

1.0 s Risk Coefficient (0.05° gridded data, 48°72° N,
160° E  125.1° W)
 [Download as Text (16 MB)]

Hawaii
0.2 s and 1.0 s RiskTargeted MCE (MCE_{R}) and Geometric
Mean PGA (MCE_{G}) Ground Motions (0.02° gridded
data, 18°23° N, 161°154° W)
 [Download as Text (3 MB)]

0.2 s Risk Coefficient (0.02° gridded data, 18°23° N,
161°154° W)
 [Download as Text (2 MB)]

1.0 s Risk Coefficient (0.02° gridded data, 18°23° N,
161°154° W)
 [Download as Text (2 MB)]

Puerto Rico/U.S. Virgin Islands
0.2 s and 1.0 s RiskTargeted MCE (MCE_{R}) and Geometric
Mean PGA (MCE_{G}) Ground Motions (0.01° gridded
data, 17.5°19° N, 67.5°64.5° W)
 [Download as Text (1 MB)]

0.2 s Risk Coefficient (0.01° gridded data, 17.5°19°
N, 67.5°64.5° W)
 [Download as Text (1021 KB)]

1.0 s Risk Coefficient (0.01° gridded data, 17.5°19°
N, 67.5°64.5° W)
 [Download as Text (1021 KB)]
2009 NEHRP
These gridded text files contain S_{SUH}, S_{1UH}, S_{SD}, S_{1D}, C_{RS}, and C_{R1} parameter values from the 2009 NEHRP Recommended Seismic Provisions. To calculate S_{S} and S_{1} (as well as S_{MS}, S_{M1}, S_{DS}, and S_{D1}), please follow the procedure outlined in the Detailed Report generated by the U.S. Seismic Design Maps. Please note that only the seismic design parameter values given below can be used to calculate S_{S} and S_{1} values that match those provided by the U.S. Seismic Design Maps for the 2009 NEHRP Recommended Seismic Provisions, the 2010 ASCE 7 Standard, and the 2012 International Building Code.

Conterminous US
0.2 s Uniform Hazard Ground Motion (0.01° gridded data,
24.6°50° N, 125°65° W)
 [Download as Text (378 MB)]

1.0 s Uniform Hazard Ground Motion (0.01° gridded data,
24.6°50° N, 125°65° W)
 [Download as Text (378 MB)]

0.2 s Risk Coefficient (0.01° gridded data,
24.6°50° N, 125°65° W)
 [Download as Text (349 MB)]

1.0 s Risk Coefficient (0.01° gridded data,
24.6°50° N, 125°65° W)
 [Download as Text (249 MB)]

0.2 s Deterministic Ground Motion (0.01° gridded data,
24.6°50° N, 125°65° W)
 [Download as Text (378 MB)]

1.0 s Deterministic Ground Motion (0.01° gridded data,
24.6°50° N, 125°65° W)
 [Download as Text (378 MB)]

Alaska
0.2 s Uniform Hazard Ground Motion (0.05° gridded data,
48°72° N, 160° E  125.1° W)
 [Download as Text (378 MB)]

1.0 s Uniform Hazard Ground Motion (0.05° gridded data,
48°72° N, 160° E  125.1° W)
 [Download as Text (378 MB)]

0.2 s Risk Coefficient (0.05° gridded data,
48°72° N, 160° E  125.1° W)
 [Download as Text (349 MB)]

1.0 s Risk Coefficient (0.05° gridded data,
48°72° N, 160° E  125.1° W)
 [Download as Text (349 MB)]

0.2 s Deterministic Ground Motion (0.05° gridded data,
48°72° N, 160° E  125.1° W)
 [Download as Text (378 MB)]

1.0 s Deterministic Ground Motion (0.05° gridded data,
48°72° N, 160° E  125.1° W)
 [Download as Text (378 MB)]

Hawaii
0.2 s Uniform Hazard Ground Motion (0.02° gridded data,
18°23° N, 161°154° W)
 [Download as Text (2 MB)]

1.0 s Uniform Hazard Ground Motion (0.02° gridded data,
18°23° N, 161°154° W)
 [Download as Text (2 MB)]

0.2 s Risk Coefficient (0.02° gridded data,
18°23° N, 161°154° W)
 [Download as Text (2 MB)]

1.0 s Risk Coefficient (0.02° gridded data,
18°23° N, 161°154° W)
 [Download as Text (2 MB)]

0.2 s Deterministic Ground Motion (0.02° gridded data,
18°23° N, 161°154° W)
 [Download as Text (2 MB)]

1.0 s Deterministic Ground Motion (0.02° gridded data,
18°23° N, 161°154° W)
 [Download as Text (2 MB)]

Puerto Rico/U.S. Virgin Islands
0.2 s Uniform Hazard Ground Motion (0.01° gridded data,
17.5°19° N, 67.5°64.5° W)
 [Download as Text (2 MB)]

1.0 s Uniform Hazard Ground Motion (0.01° gridded data,
17.5°19° N, 67.5°64.5° W)
 [Download as Text (2 MB)]

0.2 s Risk Coefficient (0.01° gridded data,
17.5°19° N, 67.5°64.5° W)
 [Download as Text (2 MB)]

1.0 s Risk Coefficient (0.01° gridded data,
17.5°19° N, 67.5°64.5° W)
 [Download as Text (2 MB)]

0.2 s Deterministic Ground Motion (0.01° gridded data,
17.5°19° N, 67.5°64.5° W)
 [Download as Text (2 MB)]

1.0 s Deterministic Ground Motion (0.01° gridded data,
17.5°19° N, 67.5°64.5° W)
 [Download as Text (1 MB)]
Derived from 2002 USGS Hazard Data
ASCE 705, 2006/09 IBC

Conterminous US
0.2 s, 1.0 s MCE Ground Motion (0.05° gridded data,
24.6°50° N, 125°65° W)
 [Download as Text (23 MB)  Binary (13 MB)]

Alaska
0.2 s, 1.0 s MCE Ground Motion (0.1° gridded data,
50°72° N, 170° E  130° W)
 [Download as Text (5 MB)  Binary (3 MB)]

California/Nevada
0.2 s, 1.0 s MCE Ground Motion (0.01° gridded data,
32°42° N, 125°115° W)
 [Download as Text (39 MB)  Binary (22 MB)]

Hawaii
0.2 s, 1.0 s MCE Ground Motion (0.02° gridded data,
18°23° N, 161°154° W)
 [Download as Text (3 MB)  Binary (2 MB)]

Intermountain West
0.2 s, 1.0 s MCE Ground Motion (0.01° gridded data,
40°45° N, 112°110° W)
 [Download as Text (5 MB)  Binary (3 MB)]

New Madrid Seismic Zone
0.2 s, 1.0 s MCE Ground Motion (0.01° gridded data,
35°38° N, 92°88° W)
 [Download as Text (4 MB)  Binary (2 MB)]

Coastal Pacific Northwest
0.2 s, 1.0 s MCE Ground Motion (0.01° gridded data,
41°49° N, 125°123° W)
 [Download as Text (6 MB)  Binary (3 MB)]

Puerto Rico/U.S. Virgin Islands
0.2 s, 1.0 s MCE Ground Motion (0.05° gridded data,
16°21° N, 70°62° W)
 [Download as Text (608 KB)  Binary (381 KB)]
2006/09 IRC

Conterminous US
Mapped Seismic Design Categories (mapped values)
 [Download as KML (1 MB)  ArcGIS™ Shapefiles (1 MB)]
Derived from 1996 USGS Hazard Data
ASCE 798/02, 2000/03 IBC

Conterminous US
0.2 s, 1.0s MCE Ground Motion (0.1° gridded data,
24.6°–50° N, 125°–65° W)
 [Download as Text (5 MB)  Binary (3 MB)]

California/Nevada
0.2 s, 1.0s MCE Ground Motion (0.01° gridded data,
32°–43° N, 125°–111° W)
 [Download as Text (60 MB)  Binary (35 MB)]
2000/03 IRC

Conterminous US
Mapped Seismic Design Categories (mapped values)
 [Download as KML (1001 KB)  ArcGIS™ Shapefiles (627 KB)]