02. Hazard curves and uniform-hazard ground motion data for Alaska

Dates

Publication Date: 2024-09-26
Model Year: 2023

Citation

Altekruse, J.M., Powers, P.M., Llenos, A.L, and Haynie, K.L., 2024, Data Release for the 2023 Alaska National Seismic Hazard Model: U.S. Geological Survey data release, https://doi.org/10.5066/P9EVWWFZ.

Summary

This dataset represents probabilistic seismic hazard curves and uniform-hazard ground motion values calculated for a grid of points with a spacing of 0.2 degrees in latitude and longitude for the state of Alaska using the 2023 National Seismic Hazard Model (NSHM) for the state of Alaska. The dataset includes (1) probabilistic seismic hazard curves (full and truncated) for peak ground acceleration (PGA), and spectral acceleration for 0.2, 1.0, 2.0, and 5.0 seconds and (2) uniform-hazard ground motion values for 2, 5, and 10% in 50 years probability of exceedance (PE) (corresponding to 2,475, 975, and 475 year return periods, respectively) for each grid point. Results are provided for site classes BC and D, which correspond with Vs30s [...]

Summary

This dataset represents probabilistic seismic hazard curves and uniform-hazard ground motion values calculated for a grid of points with a spacing of 0.2 degrees in latitude and longitude for the state of Alaska using the 2023 National Seismic Hazard Model (NSHM) for the state of Alaska. The dataset includes (1) probabilistic seismic hazard curves (full and truncated) for peak ground acceleration (PGA), and spectral acceleration for 0.2, 1.0, 2.0, and 5.0 seconds and (2) uniform-hazard ground motion values for 2, 5, and 10% in 50 years probability of exceedance (PE) (corresponding to 2,475, 975, and 475 year return periods, respectively) for each grid point. Results are provided for site classes BC and D, which correspond with Vs30s (time-averaged shear-wave velocity [VS] in the upper 30 m) of 760 and 260 m/s, respectively.

Two different sets of hazard curves are available, full (curves.csv) and truncated (curves-truncated.csv). The full gridded hazard curves data include ground motions at long return periods, whereas the truncated curves only span return periods of 10,000 years (annual frequency of exceedance of 1.0E-04) and less. The National Seismic Hazard Models are not intended to provide ground motions at return periods longer than 10,000 years.

Contacts

Point of Contact :: Earthquake Hazards Program
Process Contact :: Jason M Altekruse
Originator :: Jason M. Altekruse, Peter M. Powers, Andrea L. Llenos, Kirstie L. Haynie
Metadata Contact :: GHSC Data Steward
Publisher :: U.S. Geological Survey
USGS Mission Area :: Natural Hazards
SDC Data Owner :: Earthquake Hazards Program
Distributor :: U.S. Geological Survey - ScienceBase

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alaska_2023-hazard_curves_and_ground_motions.xml Original FGDC Metadata	View	12.98 KB	application/fgdc+xml
hazard_output-alaska_2023.zip		29.94 MB	application/zip
alaska-map-region.geojson		2.39 KB	text/plain
README.md		3.37 KB	text/x-web-markdown

Related External Resources

Type: Related Primary Publication

Powers, P.M., Altekruse, J.M., Llenos, A.L., Michael, A.J., Haynie, K.L., Haeussler, P.J., Bender, A.M., Rezaeian, S., Moschetti, M.P., Smith, J.A., Briggs, R.W., Witter, R.C., Mueller, C.S., Zeng, Y., Girot, D.L., Herrick, J.A., Shumway, A.M., and Petersen, M.D., 2024, The 2023 Alaska National Seismic Hazard Model. Earthquake Spectra, https://doi.org/10.1177/87552930241266741.	https://doi.org/10.1177/87552930241266741

Type: Source Code

Powers, P.M. and Altekruse, J.M., 2024, nshm-alaska: National Seismic Hazard Model for the State of Alaska, U.S. Geological Survey software release, https://doi.org/10.5066/P961IMZX.	https://doi.org/10.5066/P961IMZX

Purpose

Location data, hazard curves, and uniform-hazard ground motions are provided as supporting documentation for the 2023 National Seismic Hazard Model update for the state of Alaska (Powers et al., 2024).

02. Hazard curves and uniform-hazard ground motion data for Alaska

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