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nshmp-haz-ws is a Java library developed by the U.S. Geological Survey (USGS) National Seismic Hazard Mapping Project (NSHMP) earthquake hazards program (EHP) to support web services built on top of the nshmp-haz probabilistic seismic hazard analysis (PSHA) library.

This documentation describes components of the new USGS NSHMP Unified Hazard Tool (UHT), including descriptions or examples of:

• The different editions of the hazard models the NSHMP produces.
• Static vs. dynamic data.
• Common use cases.

This documentation is being actively updated and improved based on user feedback for the UHT. It will supercede or supplant the limited documentation currently available via the Documentation & Help on the application page.