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Peak ground acceleration ground motion values for 50, 10, and 2 percent probability of exceedance in 50 years are converted to equivalent modified Mercalli intensity using the relationships of Worden and others (2012). Values are for NEHRP site class B/C with a VS30 = 760 m/s.
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This data set contains maps and shapefiles of uniform-hazard ground motion values calculated for a grid of points with a spacing of 0.2° in latitude and longitude over the conterminous U.S and Alaska, and 0.02° over Hawaii, using the 2023 National Seismic Hazard Model. 2%, 5% and 10% in 50-year probability of exceedance values are shown for peak ground acceleration (PGA), and 0.2, 1, and 5 second spectral acceleration for VS30 = 760 and 260 m/s, representing the National Earthquake Hazards Reduction Program site conditions B/C and D, respectively.
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The boundaries (polygons and their tables) of the zones of induced seismicity are provided as documentation for the 50-state update of the National Seismic Hazard Model (NSHM) of 2023. These zones are within the conterminous United States and have assigned durations to represent seismicity that is considered induced. Previous NSHMs also considered the role of induced seismicity (Petersen and others, 2018 and Petersen and others, 2017) which is a separate category from other anthropogenic sources considered in the seismicity catalogs used in the hazard models. For expanded explanations, see Llenos and others (2023) and the metadata which also contains documented references used in this study.
The earthquake catalog was generated in August 2018 using the standard National Seismic Hazard Model methodology (Mueller, 2019) for the central and eastern United States. Pre-existing catalogs were merged, duplicate records were removed, the catalog was declustered, and induced earthquakes were removed. The final catalog contains 6802 records, M2.5–7.8, and extends from 1568 through July 2018.
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This data release contains data sets associated with the 2023 50-State National Seismic Hazard Model Update. The 2023 50-State National Seimsic Hazard Model (NSHM) Update includes an update to the NSHMs for the conterminous U.S (CONUS, last updated in 2018), Alaska (AK, last updated in 2007), and Hawaii (last updated in 2001). Data sets include inputs like seismicity catalogs used as input to the smoothed seismicity model and updated induced seismicity zone polygons in the central and eastern U.S., as well as outputs like hazard curves and uniform-hazard ground motion values. Plots of selected data sets are also included. The data sets provided here are primarily for the 2023 CONUS NHSM and 2023 AK NSHM. Additional...
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The 2023 National Seismic Hazard Model for the conterminous United States considers the full catalog and several declustered catalogs in calculating earthquake rates and seismic hazard. These catalogs were declustered using the Reasenberg and nearest neighbor methods. All of these catalogs are included here and are described in more detail in the paper by Llenos and others (2023).
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This data set represents probabilisitic 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 over the conterminous U.S. (CONUS) and Alaska (AK) using the 2023 National Seismic Hazard Model. CONUS The data sets includes (1) probabilistic seismic hazard curves (full and truncated) for two peak parameters, peak ground velocity (PGV) and peak ground acceleration (PGA), and pseudo-spectral accelerations at 21 oscillator periods between 0.01 and 10s, 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)...
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This dataset documents histopathological changes in liver, kidney, skeletal muscle and intestine of captive American kestrels (Falco sparverius) exposed to brodifacoum formulations with differing elimination half-lives in target rodents. The toxicity of two brodifacoum formulations with stereoisomers having markedly different elimination half-lives in rats (Formulation A containing the 2 least persistent stereoisomers, Formulation B containing the most persistent stereoisomer) were tested in a 7-day dietary feeding trial. Based on previous kestrel studies using commercially available brodifacoum, Formulations A and B were each provided at 3 dietary concentrations (0.05, 0.1 and 0.5 µg/g diet, 4 kestrels/dose level)...
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An ASD FieldSpec 4 Hi-Res NG Spectroradiometer was used to collect the reflectance properties of soil and rock in southcentral Alaska, USA (Figure 1) around the city of Anchorage (Figure 2) and the Prince William Sound (Figure 3). Reflectance is a property of the material being observed, being the ratio of the amount of light leaving a target to the amount of light striking the target. Reflectance is a unitless value from 0 to 1, where a value of 0 indicates that the material absorbs all energy and 1 indicates total reflectance. Additionally, samples were collected from the field and later measured using the spectrometer in the laboratory. Both field and laboratory data were collected in the summer and fall of 2022....
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This data set represents multiple period response spectra (MPRS) results for 160 test sites for the conterminous U.S (CONUS) using the 2023 National Seismic Hazard Model. The data sets includes (1) probabilistic seismic hazard curves (full and truncated) for peak ground velocity (PGV), peak ground acceleration (PGA), and 21 spectra periods from 0.01 to 10 seconds spectra acceleration 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) and 1% in 100 year PE (corresponding to a 10,000-year return period) for each of the 160 test sites. Results are provided for VS30 = 1500, 1080, 760, 530, 365,...
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The 2023 Update of the U.S. National Seismic Hazard Model defines the potential for earthquake ground shaking for various probability levels across the United States and is applied in seismic provisions of building codes, insurance rate structures, risk assessments, and other public policy. The updated model represents an assessment of the best available science in earthquake hazards and incorporates new findings on earthquake ground shaking, seismicity, and long-period amplification over deep sedimentary basins. The new model represents an update of the seismic hazard model; previous versions were developed in 1996, 2002, 2008, 2014, and 2018. This data set represents the chance of potentially damaging ground shaking...
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Body weight and weight change during course of study, estimates of food and brodifacoum consumption, observations of test birds during feeding trial and at necropsy, hematocrit, and prothrombin time
    map background search result map search result map Earthquake catalog (1568 to 2018) for the USGS National Seismic Hazard Model and Nuclear Regulatory Commission Spectral reflectance data of rock and soil in southcentral Alaska Data Release for the 2023 U.S. 50-State National Seismic Hazard Model - Overview 03. Hazard curves and uniform-hazard ground motion data for the conterminous U.S. and Alaska 04. Uniform-hazard ground motion maps for the conterminous U.S., Alaska, and Hawaii 06. Chance of potentially damaging ground shaking (MMI=VI) in 100 years, based on the 2023 update to the National Seismic Hazard Model for the conterminous U.S., Alaska, and Hawaii 01. Seismicity catalogs for the conterminous U.S. 05. Multiple period response spectra for 160 conterminous U.S. test sites 02. Central and eastern U.S. induced seismicity zones 07. Modified Mercalli Intensity maps for the conterminous U.S., Alaska, and Hawaii Brodifacoum isomer formulation study Histopathology of American Kestrels (Falco sparverius) Exposed to Two Brodifacoum Isomer Formulations with Differing Elimination Half-Lives Histopathology of American Kestrels (Falco sparverius) Exposed to Two Brodifacoum Isomer Formulations with Differing Elimination Half-Lives Brodifacoum isomer formulation study Spectral reflectance data of rock and soil in southcentral Alaska 02. Central and eastern U.S. induced seismicity zones 05. Multiple period response spectra for 160 conterminous U.S. test sites Earthquake catalog (1568 to 2018) for the USGS National Seismic Hazard Model and Nuclear Regulatory Commission 01. Seismicity catalogs for the conterminous U.S. 03. Hazard curves and uniform-hazard ground motion data for the conterminous U.S. and Alaska Data Release for the 2023 U.S. 50-State National Seismic Hazard Model - Overview 04. Uniform-hazard ground motion maps for the conterminous U.S., Alaska, and Hawaii 06. Chance of potentially damaging ground shaking (MMI=VI) in 100 years, based on the 2023 update to the National Seismic Hazard Model for the conterminous U.S., Alaska, and Hawaii 07. Modified Mercalli Intensity maps for the conterminous U.S., Alaska, and Hawaii