Request for Hazard Modeling Contributions

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The U.S. Geological Survey (USGS) will next update the National Seismic Hazard Model (NSHM) for the conterminous U.S. in 2023. The timing of this update will allow 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).
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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, or published data and methods the USGS can use to develop the 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 Nicolas Luco (email link). Allison Shumway will reply to confirm receipt and request additional information, if needed.