Request for Hazard Modeling Contributions

Science Center Objects

The U.S. Geological Survey (USGS) will publish an updated National Seismic Hazard Model (NSHM) in 2023. This update covers the conterminous U.S., Alaska, and Hawaii.   

The updates for the conterminous U.S. and Alaska will follow the schedule below. The update for Hawaii is already underway and will likely be published before 2023, but any additional updates will also follow the schedule below. The schedule allows for:

  • 2 years of development, including evaluations of non-USGS ground motion and source models (e.g., NGA-Subduction),
  • User feedback early and often (e.g., a kick-off workshop in January 2021, and regional workshops scheduled throughout the update process; workshop information will be posted as soon as information is available),
  • 1 year for publication, including reconciliation of reviews from a journal, the NSHM Steering Committee, building code and other users, and the public, and
  • Coordination with the next edition of the NEHRP Recommended Seismic Provisions for New Buildings and Other Structures (as well as the 2028 ASCE 7 Standard and 2030 International Building Code).

Workshops - upcoming and past

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 2023 NSHM Update Schedule (Public domain.)

The deadline for the earthquake hazard community to send published ground motion and source models, data, and methods for the 2023 NSHM is December 31, 2020. Only published (or accepted for publication), peer-reviewed data, methods, and models will be considered. The sooner they are brought to our attention, the more likely it is that we can include them, resources permitting.

Please bring the publications to our attention by emailing Allison Shumway with cc to Mark Petersen and Peter Powers. Allison Shumway will reply to confirm receipt and request additional information, if needed.