Seismic design data from USGS for US locations
Get USGS Seismic Design Data
Returns seismic design parameters from the USGS Seismic Design Web Services for US locations.
Data Provided:
- Spectral response acceleration parameters (Ss, S1)
- Site-adjusted values (SMs, SM1, SDs, SD1)
- Seismic design category
- Risk-targeted ground motion values
Standards Supported:
- ASCE 7-16
- ASCE 7-22
Note: For most use cases, prefer the /gis/environmental_loads endpoint which includes seismic data automatically for US locations.
query Parameters
latitudenumber · min: -90 · max: 90 · requiredLatitude in decimal degrees (WGS84)
longitudenumber · min: -180 · max: 180 · requiredLongitude in decimal degrees (WGS84)
riskCategorystring · enumBuilding risk category per ASCE 7
Enum values:IIIIIIIVDefault: IIsiteClassstringSite soil classification. ASCE 7-16: A, B, C, D, E. ASCE 7-22: A, B, BC, C, CD, D, DE, E
Default: Dstandardstring · enumDesign standard version
Enum values:ASCE 7-16ASCE 7-22Default: ASCE 7-22
Headers
Authorizationstring · requiredThe
Authorizationheader is used to authenticate with the API using your API key. Value is of the formatBearer YOUR_KEY_HERE.
Responses
USGS seismic design parameters
SsnumberSpectral response acceleration at short periods (g)
S1numberSpectral response acceleration at 1 second (g)
TLobjectLong-period transition period
SdsnumberDesign spectral response acceleration at short periods
Sd1numberDesign spectral response acceleration at 1 second (ASCE 7-22 only)
SDCstringSeismic Design Category (A, B, C, D, E, F)
_warningsstring[]