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1.3 Alaska 2023.R1 hazard curves and uniform-hazard ground motion data
These hazard data, labeled Alaska.2023.R1, accompany revisions to the 2023 50-state National Seismic Hazard Model (NSHM; Petersen and others, 2024 and, for the state of Alaska, Powers and others, 2024) as documented in Powers and others (2026). This dataset supersedes the data releases of Petersen and others (2023) and Altekruse and others (2024). In this revision, we change the representation of magnitude (M) 7-8 earthquake ruptures on the Alaskan megathrust and fix a few input files and hazard codes.
This dataset contains probabilistic seismic hazard curves and uniform-hazard ground motion values calculated for a grid of points with a spacing of 0.1 degrees in latitude and longitude for the state of Alaska, and the Alaska test sites, using the 2023 National Seismic Hazard Model (NSHM) for the state of Alaska version 3.0.0 (with nshmp-haz v. 2.6.7 and nshmp-lib v. 1.7.5). The dataset includes (1) long-term, time-independent mean hazard curves (full and truncated) for peak ground velocity (PGV), peak ground acceleration (PGA), and spectral accelerations at 21 spectral periods from 0.01 to 10 seconds spectral accelerations, with a 5% damped response, 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). Results are provided for Vs30s (time-averaged shear-wave velocity [VS] in the upper 30 m) of 1500, 1080, 760, 530, 365, 260, 185, and 150 m/s, representing the National Earthquake Hazards Reduction Program site conditions A, B, BC, C, CD, D, DE and E, respectively (Building Seismic Safety Council, 2020).
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Complete Metadata
| accessLevel | public |
|---|---|
| bureauCode |
[ "010:12" ] |
| contactPoint |
{ "fn": "Jason M Altekruse", "@type": "vcard:Contact", "hasEmail": "mailto:jaltekruse@usgs.gov" } |
| description | These hazard data, labeled Alaska.2023.R1, accompany revisions to the 2023 50-state National Seismic Hazard Model (NSHM; Petersen and others, 2024 and, for the state of Alaska, Powers and others, 2024) as documented in Powers and others (2026). This dataset supersedes the data releases of Petersen and others (2023) and Altekruse and others (2024). In this revision, we change the representation of magnitude (M) 7-8 earthquake ruptures on the Alaskan megathrust and fix a few input files and hazard codes. This dataset contains probabilistic seismic hazard curves and uniform-hazard ground motion values calculated for a grid of points with a spacing of 0.1 degrees in latitude and longitude for the state of Alaska, and the Alaska test sites, using the 2023 National Seismic Hazard Model (NSHM) for the state of Alaska version 3.0.0 (with nshmp-haz v. 2.6.7 and nshmp-lib v. 1.7.5). The dataset includes (1) long-term, time-independent mean hazard curves (full and truncated) for peak ground velocity (PGV), peak ground acceleration (PGA), and spectral accelerations at 21 spectral periods from 0.01 to 10 seconds spectral accelerations, with a 5% damped response, 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). Results are provided for Vs30s (time-averaged shear-wave velocity [VS] in the upper 30 m) of 1500, 1080, 760, 530, 365, 260, 185, and 150 m/s, representing the National Earthquake Hazards Reduction Program site conditions A, B, BC, C, CD, D, DE and E, respectively (Building Seismic Safety Council, 2020). |
| distribution |
[ { "@type": "dcat:Distribution", "title": "Digital Data", "format": "XML", "accessURL": "https://doi.org/10.5066/P14VGAV4", "mediaType": "application/http", "description": "Landing page for access to the data" }, { "@type": "dcat:Distribution", "title": "Original Metadata", "format": "XML", "mediaType": "text/xml", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.681bbdefd4be0260c2c45c80.xml" } ] |
| identifier | http://datainventory.doi.gov/id/dataset/USGS_681bbdefd4be0260c2c45c80 |
| keyword |
[ "Alaska", "NSHM", "NSHMP", "National Seismic Hazard Map", "National Seismic Hazard Model", "National Seismic Hazard Model Project", "USA", "USGS:681bbdefd4be0260c2c45c80", "United States", "earthquakes", "hazards", "seismology" ] |
| modified | 2026-08-10T00:00:00Z |
| publisher |
{ "name": "U.S. Geological Survey", "@type": "org:Organization" } |
| spatial | 171.0000, 49.9000, -128.6000, 71.6000 |
| theme |
[ "geospatial" ] |
| title | 1.3 Alaska 2023.R1 hazard curves and uniform-hazard ground motion data |
