Mark D. Petersen Allison M. Shumway Peter M. Powers Edward H. Field Morgan P. Moschetti Kishor S. Jaiswal Kevin S. Milner Sanaz Rezaian Arthur D. Frankel Andrea L. Llenos Andrew J. Michael Jason M. Altekruse Sean K. Ahdi Kyle B. Withers Charles S. Mueller Yuehua Zeng Robert E. Chase Leah M. Salditch Nico Luco Kenneth S. Rukstales Julie A. Herrick Demi L. Girot Brad T. Aagaard Adrian M. Bender Michael L. Blanpied Richard W. Briggs Oliver S. Boyd Brandon S. Clayton Christopher B. DuRoss Eileen L. Evans Peter J. Haeussler Alexandra E. Hatem Kirstie L. Haynie Elizabeth H. Hearn Kaj M. Johnson Zachary A. Kortum Simon Neal Kwong Andrew J. Makdisi Henry B. Mason Daniel E. McNamara Devin F. McPhillips Paul Okubo Morgan T. Page Frederick Pollitz Justin L. Rubinstein Bruce E. Shaw Zheng-Kang Shen Brian R. Shiro James A. Smith William J. Stephenson Eric M. Thompson Jessica Ann Thompson Jobe Erin A. Wirth Robert C. Witter 20231228 zip archives containing maps in PDF format, and GIS shapefiles used to create the maps Data Release n/a n/a ScienceBase Suggested citation: Petersen MD, Shumway AM, Powers PM, Field EH, Moschetti MP, Jaiswal KS, Milner KR, Rezaeian S, Frankel AD, Llenos AL, Michael AJ, Altekruse JM, Ahdi SK, Withers KB, Mueller CS, Zeng Y, Chase RE, Salditch LM, Luco N, Rukstales KS, Herrick JA, Girot DL, Aagaard BT, Bender AM, Blanpied ML, Briggs RW, Boyd OS, Clayton BS, DuRoss CB, Evans EL, Haeussler PJ, Hatem AE, Haynie KL, Hearn EH, Johnson KM, Kortum ZA, Kwong NS, Makdisi AJ, Mason HB, McNamara DE, McPhillips DF, Okubo PG, Page MT, Pollitz FF, Rubinstein JL, Shaw BE, Shen Z-K, Shiro BR, Smith JA, Stephenson WJ, Thompson EM, Thompson Jobe JA, Wirth EA and Witter RC (2023) 2023 50-State National Seismic Hazard Policy Model: Overview. U.S. Geological Survey data release, https://doi.org/10.5066/P9GNPCOD. https://doi.org/10.5066/P9GNPCOD Mark D. Petersen et al. 20231228 publication Earthquake Spectra ##/# n/a Sage Suggested citation: Petersen MD, Shumway AM, Powers PM, Field EH, Moschetti MP, Jaiswal KS, Milner KR, Rezaeian S, Frankel AD, Llenos AL, Michael AJ, Altekruse AM, Ahdi SK, Withers KB, Mueller CS, Zeng Y, Chase RE, Salditch LM, Luco N, Rukstales KS, Herrick JA, Girot DL, Aagaard BT, Bender AM, Blanpied ML, Briggs RW, Boyd OS, Clayton BS, DuRoss CB, Evans EL, Haeussler PJ, Hatem AE, Haynie KL, Hearn EH, Johnson KM, Kortum ZA, Kwong NS, Makdisi AJ, Mason HB, McNamara DE, McPhillips DF, Okubo PG, Page MT, Pollitz FF, Rubinstein JL, Shaw BE, Shen Z-K, Shiro BR, Smith JA, Stephenson WJ, Thompson EM, Thompson Jobe JA, Wirth EA and Witter RC (2023) The 2023 U.S. 50-state National Seismic Hazard Model: Overview and implications. Earthquake Spectra, in review. http://journals.sagepub.com/doi/10.1177/87552930231215428 Uniform-hazard ground motion maps and their underlying GIS data were prepared for PGA and horizontal spectral accelerations at 0.2, 1.0, and 5.0 second period, with a probability of exceedance of 2%, 5% and 10% in 50 years, for NEHRP soil site classes B/C and D (VS30 equal to 760 and 260 m/s, respectively). The data are for 2%, 5%, and 10% probability of exceedance in 50 years for common ground accelerations and NEHRP site classes. 20231228 publication date Complete As needed -180 180 71.6 18.7 USGS Thesaurus earthquakes hazards seismology USGS Metadata Identifier USGS:64ff886dd34ed30c2057b4d9 http://geonames.usgs.gov/ conterminous United States Alaska Hawaii USA United States none 2023 None The data are not to be used for areas outside the United States. Acknowledgment of the U.S. Geological Survey, National Seismic Hazard Mapping Project would be appreciated in products derived from these data. Ken Rukstales U.S. Geological Survey - Geologic Hazards Science Center mailing address

Box 25046, MS 966

Denver CO 80225 USA 303-273-8677 rukstales@usgs.gov Microsoft Windows 10 Esri ArcGIS Pro 3.1 This data set is based on a seismological model. The following report provides information on quality assessment for the data set: Petersen MD, Shumway AM, Powers PM, Field EH, Moschetti MP, Jaiswal KS, Milner KR, Rezaeian S, Frankel AD, Llenos AL, Michael AJ, Altekruse AM, Ahdi SK, Withers KB, Mueller CS, Zeng Y, Chase RE, Salditch LM, Luco N, Rukstales KS, Herrick JA, Girot DL, Aagaard BT, Bender AM, Blanpied ML, Briggs RW, Boyd OS, Clayton BS, DuRoss CB, Evans EL, Haeussler PJ, Hatem AE, Haynie KL, Hearn EH, Johnson KM, Kortum ZA, Kwong NS, Makdisi AJ, Mason HB, McNamara DE, McPhillips DF, Okubo PG, Page MT, Pollitz FF, Rubinstein JL, Shaw BE, Shen Z-K, Shiro BR, Smith JA, Stephenson WJ, Thompson EM, Thompson Jobe JA, Wirth EA and Witter RC (2023) The 2023 U.S. 50-state National Seismic Hazard Model: Overview and implications. Earthquake Spectra, in review. The gridded uniform-hazard data have been contoured using ArcGIS Pro. Both polygon and arc/line data are included. Some lines in the arc/line shapefiles that were needed in order to make closed polygon are included in the line shapefiles, but are not actual contours. Some data that appear in the shapefiles do not appear on the maps for cartographic purposes. The location of features is based on calculations of a seismological model for the study area. The location of each point is considered to be correct within the confines of computer accuracy. Based upon the 2021 Update of the U.S. National Seismic Hazard Model for Hawaii, and the 2023 Update for Alaska and the conterminous United States, a suite of hazard curves were calculated for an equally spaced grid of points. The grid has a cell spacing of 0.02 degrees in both latitude and longitude for Hawaii, and 0.2 degrees for Alaska and the conterminous United States. Gridded, uniform-hazard data with probabilities of exceedance for 2%, 5%, and 10% in 50 years were calculated from the hazard curves for PGA and horizontal spectral accelerations at 0.2, 1.0, and 5.0 second period and NEHRP site class B/C and D. 2023 The gridded, uniform-hazard data were contoured using ArcGIS Pro. Closed polygons were created between neighboring contours in order to create polygon topology for the colorized maps. 2023 Polygon and line shapefiles are included. Vector Ring composed of arcs 0.02 0.02 Decimal degrees D_WGS_1984 World Geodetic System 1984 6378137 298.257223563 US_PGA_2Pct_5Pct_10Pct_50Yrs_BC.zip Zipped archive of uniform-hazard ground motion maps and shapefiles prepared for peak ground acceleration (PGA), with a probability of exceedance of 2%, 5% and 10% in 50 years, for NEHRP soil site class B/C (VS30 equal to 760 m/s). Separate shapefiles with polygon and arc topology are included. ArcGIS layer files are included for the polygon shapefiles. Maps are in PDF format. USGS US_PGA_2Pct_5Pct_10Pct_50Yrs_D.zip Zipped archive of uniform-hazard ground motion maps and shapefiles prepared for peak ground acceleration (PGA), with a probability of exceedance of 2%, 5% and 10% in 50 years, for NEHRP soil site class D (VS30 equal to 260 m/s). Separate shapefiles with polygon and arc topology are included. ArcGIS layer files are included for the polygon shapefiles. Maps are in PDF format. USGS US_SA0P2_2Pct_5Pct_10Pct_50Yrs_BC.zip Zipped archive of uniform-hazard ground motion maps and shapefiles prepared for horizontal spectral accelerations at 0.2-second period, with a probability of exceedance of 2%, 5% and 10% in 50 years, for NEHRP soil site class B/C (VS30 equal to 760 m/s). Separate shapefiles with polygon and arc topology are included. ArcGIS layer files are included for the polygon shapefiles. Maps are in PDF format. USGS US_SA0P2_2Pct_5Pct_10Pct_50Yrs_D.zip Zipped archive of uniform-hazard ground motion maps and shapefiles prepared for horizontal spectral accelerations at 0.2-second period, with a probability of exceedance of 2%, 5% and 10% in 50 years, for NEHRP soil site class D (VS30 equal to 260 m/s). Separate shapefiles with polygon and arc topology are included. ArcGIS layer files are included for the polygon shapefiles. Maps are in PDF format. USGS US_SA1P0_2Pct_5Pct_10Pct_50Yrs_BC.zip Zipped archive of uniform-hazard ground motion maps and shapefiles prepared for horizontal spectral accelerations at 1-second period, with a probability of exceedance of 2%, 5% and 10% in 50 years, for NEHRP soil site class B/C (VS30 equal to 760 m/s). Separate shapefiles with polygon and arc topology are included. ArcGIS layer files are included for the polygon shapefiles. Maps are in PDF format. USGS US_SA1P0_2Pct_5Pct_10Pct_50Yrs_D.zip Zipped archive of uniform-hazard ground motion maps and shapefiles prepared for horizontal spectral accelerations at 1-second period, with a probability of exceedance of 2%, 5% and 10% in 50 years, for NEHRP soil site class D (VS30 equal to 260 m/s). Separate shapefiles with polygon and arc topology are included. ArcGIS layer files are included for the polygon shapefiles. Maps are in PDF format. USGS US_SA5P0_2Pct_5Pct_10Pct_50Yrs_BC.zip Zipped archive of uniform-hazard ground motion maps and shapefiles prepared for horizontal spectral accelerations at 5-second period, with a probability of exceedance of 2%, 5% and 10% in 50 years, for NEHRP soil site class B/C (VS30 equal to 760 m/s). Separate shapefiles with polygon and arc topology are included. ArcGIS layer files are included for the polygon shapefiles. Maps are in PDF format. USGS US_SA5P0_2Pct_5Pct_10Pct_50Yrs_D.zip Zipped archive of uniform-hazard ground motion maps and shapefiles prepared for horizontal spectral accelerations at 5-second period, with a probability of exceedance of 2%, 5% and 10% in 50 years, for NEHRP soil site class D (VS30 equal to 260 m/s). Separate shapefiles with polygon and arc topology are included. ArcGIS layer files are included for the polygon shapefiles. Maps are in PDF format. USGS The zipped archives contain individual, page-size maps for each ground-motion type, probability of exceedance level, and soil site classification. The maps are in PDF format with separate cartographic layers. The archives also contain both a polygon and arc shapefile for each map. The shapefiles represent the contoured, uniform-hazard data represented on each map. The shapefile names are descriptive of the uniform-hazard data they represent. The arc shapefiles contain an attribute named contour, which is the contoured ground motion hazard value in units of g (acceleration due to gravity). Arcs with the contour attribute equal to -1000000 are not valid contours, but are include to create closed polygons. The polygon shapefiles contain an attribute named range_cont, which represents the possible range of ground motion hazard values within that polygon, in units of g. All of the shapefiles are contoured at an equal interval of 0.01g, except for the 5-second period data, which are contoured at an equal interval of 0.0025g, and the 0.2-second period with a two percent probability of exceedance in 50 years site class B/C data, which are contoured at an equal interval of 0.02g. ArcGIS layer files used to symbolize the polygons are included in each zip archive. The custom Arcade expression in each layer file can be edited to change polygon hazard intervals. none U.S. Geological Survey - ScienceBase mailing address

Denver Federal Center, Building 810, Mail Stop 302

Lakewood CO 80215 USA 1-888-275-8747 sciencebase@usgs.gov Downloadable zip archive. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this information product, for the most part, is in the public domain, it also contains copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner whenever applicable. The data have been approved for release and publication by the U.S. Geological Survey (USGS). Although the data have been subjected to rigorous review and are substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, the data are released on the condition that neither the USGS nor the U.S. Government may be held liable for any damages resulting from authorized or unauthorized use. Although the data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and/or contained herein. Users of the data are advised to read all metadata and associated documentation thoroughly to understand appropriate use and data limitations. zip archive 1.0 zip archives of maps in PDF format and GIS shapefiles Uniform-hazard data with a 2%, 5%, and 10% probability of exceedance in 50 years Files need to be decompressed using winzip or similar utility 100 https://doi.org/10.5066/P9GNPCOD none 20231221 U.S. Geological Survey - Geologic Hazards Science Center GHSC Data Steward mailing address

Box 25046, MS 966

Lakewood CO 80225 USA 303-273-8500 ghsc_metadata@usgs.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time