| AEP | Annual Exceedance Probability |
| AFE | Annual Frequency of Exceedance |
| ASCE | American Society of Civil Engineers |
| CEUS | Central and Eastern United States |
| CONUS | Conterminous United States |
| CPD | Computer Program Document |
| DSHA | Deterministic Seismic Hazard Analysis |
| FEMA | Federal Emergency Management Agency |
| GM | Ground Motion |
| GMPE | Ground Motion Prediction Equation |
| HEC | Hydrologic Engineering Center |
| IWR | Institute for Water Resources |
| LT | Long Term |
| NEHRP | National Earthquake Hazards Reduction Program |
| PGA | Peak Ground Acceleration |
| PGV | Peak Ground Velocity |
| PSHA | Probabilistic Seismic Hazard Analysis |
| QC | Quality Control |
| RMC | Risk Management Center |
| RP | Return Period |
| SA | Spectral Acceleration |
| ST | Short Term |
| SEI | Structural Engineering Institute |
| UDF | User-Defined Function |
| U.S. | United States |
| USACE | United States Army Corps of Engineers |
| USAID | United States Agency for International Development |
| USGS | United States Geological Survey |
