Skip to main content
U.S. flag

An official website of the United States government

Simplifying complex fault data for systems-level analysis: Earthquake geology inputs for U.S. NSHM 2023

August 18, 2022

As part of the U.S. National Seismic Hazard Model (NSHM) update planned for 2023, two databases were prepared to more completely represent Quaternary-active faulting across the western United States: the NSHM23 fault sections database (FSD) and earthquake geology database (EQGeoDB). In prior iterations of NSHM, fault sections were included only if a field-measurement-derived slip rate was estimated along a given fault. By expanding this inclusion criteria, we were able to assess a larger set of faults for use in NSHM23. The USGS Quaternary Fault and Fold Database served as a guide for assessing possible additions to the NSHM23 FSD. Reevaluating available data from published sources yielded an increase of fault sections from ~650 faults in NSHM18 to ~1,000 faults proposed for use in NSHM23. EQGeoDB, a companion dataset linked to NSHM23 FSD, contains geologic slip rate estimates for fault sections included in FSD. Together, these databases serve as common input data used in deformation modeling, earthquake rupture forecasting, and additional downstream uses in NSHM development.

Citation Information

Publication Year 2022
Title Simplifying complex fault data for systems-level analysis: Earthquake geology inputs for U.S. NSHM 2023
DOI 10.1038/s41597-022-01609-7
Authors Alexandra Elise Hatem, Camille Marie Collett, Richard W. Briggs, Ryan D. Gold, Stephen J. Angster, Edward H. Field, Peter M. Powers
Publication Type Article
Publication Subtype Journal Article
Series Title Scientific Data
Index ID 70235785
Record Source USGS Publications Warehouse
USGS Organization Earthquake Science Center, Geologic Hazards Science Center

Related Content