Seismic Design Data Sets

These gridded text files contain S_S and S₁ 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 S₁. Should you choose to interpolate the gridded values provided below, you will be doing so after the S_S and S₁ 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.

These gridded text files contain S_S, S₁, 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 S₁. Should you choose to interpolate the gridded values provided below, you will be doing so after the S_S and S₁ 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.

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 S₁ (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 S₁ 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.