Filters: Contacts: Jeffrey Ger (X)
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For background, please see the Parent Item. The attached files below for 8 site classes each provide risk-targeted spectral accelerations (in units of g) for a grid of latitudes and longitudes and 22 spectral periods, including 0.0 seconds for peak ground acceleration (denoted SA0P0). To compare these risk-targeted spectral accelerations with uniform-hazard counterparts analogous to those in previous editions of the AASHTO Design Specifications, corresponding risk coefficients are also provided (for all of the site classes in a single ZIP file). The risk coefficients are ratios of the risk-targeted divided by uniform-hazard spectral accelerations, with the latter for a 7% probability of being exceeded in 75 years....
Categories: Data
For background, please see the Parent Item. The attached files below for 8 site classes each provide risk-targeted spectral accelerations (in units of g) for a grid of latitudes and longitudes and 22 spectral periods, including 0.0 seconds for peak ground acceleration (denoted SA0P0). The spectral accelerations for Site Class BC and spectral periods of 0.0, 0.2, and 1.0 seconds were directly derived from the USGS seismic hazard curves released in the "Associated Item"; from these three values, the spectral accelerations for the other site classes and spectral periods were derived indirectly via the FEMA P-2078 procedures cited below, because corresponding USGS hazard curves were not yet available for Guam and the...
Categories: Data
For background, please see the Parent Item. The attached files below for 8 site classes each provide risk-targeted spectral accelerations (in units of g) for a grid of latitudes and longitudes and 22 spectral periods, including 0.0 seconds for peak ground acceleration (denoted SA0P0). To compare these risk-targeted spectral accelerations with uniform-hazard counterparts analogous to those in previous editions of the AASHTO Design Specifications, corresponding risk coefficients are also provided (for all of the site classes in a single ZIP file). The risk coefficients are ratios of the risk-targeted divided by uniform-hazard spectral accelerations, with the latter for a 7% probability of being exceeded in 75 years....
Categories: Data
For background, please see the Parent Item. The attached files below for 8 site classes each provide risk-targeted spectral accelerations (in units of g) for a grid of latitudes and longitudes and 22 spectral periods, including 0.0 seconds for peak ground acceleration (denoted SA0P0). The spectral accelerations for Site Class BC and spectral periods of 0.0, 0.2, and 1.0 seconds were directly derived from the USGS seismic hazard curves released in the "Associated Item"; from these three values, the spectral accelerations for the other site classes and spectral periods were derived indirectly via the FEMA P-2078 procedures cited below, because corresponding USGS hazard curves were not yet available for Alaska.
Categories: Data
For background, please see the Parent Item. The attached files below for 8 site classes each provide risk-targeted spectral accelerations (in units of g) for a grid of latitudes and longitudes and 22 spectral periods, including 0.0 seconds for peak ground acceleration (denoted SA0P0). The spectral accelerations for Site Class BC and spectral periods of 0.0, 0.2, and 1.0 seconds were directly derived from the USGS seismic hazard curves released in the "Associated Item"; from these three values, the spectral accelerations for the other site classes and spectral periods were derived indirectly via the FEMA P-2078 procedures cited below, because corresponding USGS hazard curves were not yet available for Puerto Rico...
Categories: Data
For background, please see the Parent Item. The attached files below for 8 site classes each provide risk-targeted spectral accelerations (in units of g) for a grid of latitudes and longitudes and 22 spectral periods, including 0.0 seconds for peak ground acceleration (denoted SA0P0). The spectral accelerations for Site Class BC and spectral periods of 0.0, 0.2, and 1.0 seconds were directly derived from the USGS seismic hazard curves released in the "Associated Item"; from these three values, the spectral accelerations for the other site classes and spectral periods were derived indirectly via the FEMA P-2078 procedures cited below, because corresponding USGS hazard curves were not yet available for American Samoa.
Categories: Data
For designing bridges to safely resist earthquakes, the 2023 editions of the AASHTO (1) Guide Specifications for LRFD Seismic Bridge Design, (2) LRFD Bridge Design Specifications, and (3) Guide Specifications for Seismic Isolation Design provide risk-targeted design ground motions via this data release and the corresponding USGS Seismic Design Web Services (listed below). The web services spatially interpolate the gridded ground motions of this data release for user-specified latitudes and longitudes. All of the data files within the regional "Child Items" below were derived from respective USGS National Seismic Hazard Models (cited below). Details of the derivation will be added to this data release upon publication...
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