This software was developed to meet the U.S. Geological Survey's need for a high-performance probabilistic seismic hazard (PSHA) engine capable of supporting increasingly complex earthquake hazard models via web-services. It leverages and benefits from many design and performance features found in OpenSHA and the legacy USGS fortran codes, both of which have been supported by the USGS and others over many years. In particular, the Southern California Earthquake Center (SCEC) has been instrumental in the continued development of OpenSHA, which is in use worldwide.
This software is not a replacement for OpenSHA and does not provide a public API for PSHA development. In the near future, nshmp-haz will likely be added as a dependency in OpenSHA so that it's users may gain access to the most current USGS hazard models.