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#           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

## Related Content

                  -              Data           
                  -              Connect           

May 24, 2022

####                 Plotting multiple fault representations: Applications for National Seismic Hazard Model 2023 update (NSHM-faultmaps)              

Natural Hazards Mission Area, Earthquake Hazards Program, Geologic Hazards Science Center

#### Alexandra (Alex) Hatem

##### Research Geologist

Earthquake Hazards Program

ahatem@usgs.gov

303-273-8474

####             Camille Collett (Former Employee)          

##### Geologist, Public Affairs Specialist

Earthquake Hazards Program

#### Rich Briggs

##### Research Geologist

Earthquake Hazards Program

rbriggs@usgs.gov

303-273-8465

#### Ryan D Gold, Ph.D.

##### Director, Geologic Hazards Science Center

Geologic Hazards Science Center

rgold@usgs.gov

303-273-8633

#### Stephen J. Angster, Ph.D.

##### Research Geologist

Earthquake Science Center

sangster@usgs.gov

#### Ned Field

##### Research Geophysicist

Earthquake Hazards Program

field@usgs.gov

303-273-8469

#### Peter M Powers, PhD

##### Research Geophysicist

Earthquake Hazards Program

pmpowers@usgs.gov

303-273-8467

## Related Content

May 24, 2022

####                 Plotting multiple fault representations: Applications for National Seismic Hazard Model 2023 update (NSHM-faultmaps)              

Natural Hazards Mission Area, Earthquake Hazards Program, Geologic Hazards Science Center

#### Alexandra (Alex) Hatem

##### Research Geologist

Earthquake Hazards Program

ahatem@usgs.gov

303-273-8474

####             Camille Collett (Former Employee)          

##### Geologist, Public Affairs Specialist

Earthquake Hazards Program

#### Rich Briggs

##### Research Geologist

Earthquake Hazards Program

rbriggs@usgs.gov

303-273-8465

#### Ryan D Gold, Ph.D.

##### Director, Geologic Hazards Science Center

Geologic Hazards Science Center

rgold@usgs.gov

303-273-8633

#### Stephen J. Angster, Ph.D.

##### Research Geologist

Earthquake Science Center

sangster@usgs.gov

#### Ned Field

##### Research Geophysicist

Earthquake Hazards Program

field@usgs.gov

303-273-8469

#### Peter M Powers, PhD

##### Research Geophysicist

Earthquake Hazards Program

pmpowers@usgs.gov

303-273-8467

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####               Earthquake Science Center          

350 N. Akron RoadMoffett Field, CA94035United States

#### Geologic Hazards Science Center

1711 Illinois St.Golden, CO80401United States

303-273-8500

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