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Data Release for the 2018 Update of the U.S. National Seismic Hazard Model: Where, Why, and How Much Probabilistic Ground Motion Maps Changed This dataset presents where, why, and how much probabilistic ground motions have changed with the 2018 update of the National Seismic Hazard Model (NSHM) for the conterminous U.S. (CONUS) vs. the 2014 NSHM. In the central and eastern U.S., hazard changes are the result of updated ground motion models (further broken down by median and epistemic uncertainty, aleatory variability, and site effects models) and gridded seismicity models. In the western U.S., hazard changes are the result of updated ground motion models in four urban areas with deep sedimentary basins and gridded seismicity models. Probabilistic ground motion changes (2% in 50 years probability of exceedance for a firm rock site, VS30 = 760 m/s, NEHRP... Categories: Data; Tags: Conterminous U.S., EHP, Earthquake Hazards Program, GHSC, Geologic Hazards Science Center, All tags... Geophysics, NEHRP site classes, NSHM, NSHMP, National Seismic Hazard Model, National Seismic Hazard Model Project, Seismology, U.S. Seismic Hazard Maps, USGS, USGS Science Data Catalog (SDC), ground motion, hazard curve, hazard map, spectral period, Fewer tags 07. Modified Mercalli Intensity maps for the conterminous U.S., Alaska, and Hawaii 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. Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Class B/C, Conterminous United States (CONUS), Earthquake, Hazard, MMI, All tags... NSHM, PSHA, Seismic, exceedance probability, Fewer tags Data Release for the 2023 U.S. 50-State National Seismic Hazard Model - Overview 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... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Alaska, Conterminous United States, Earthquake, Hawaii, Hazard, All tags... Map Service, National Seismic Hazard Model, OGC WFS Layer, OGC WMS Layer, OGC WMS Service, Seismic, Seismology, USGS Science Data Catalog (SDC), earthquake hazard, geophysics, seismology, Fewer tags