This web portal provides links to web tools, maps, and underlying data for the earthquake ground motions of several seismic design documents. Click on each document title below to see the links. For questions/comments, email nluco@usgs.gov.
The earthquake ground motions of this group of seismic design documents are based on the 2021 USGS National Seismic Hazard Model (NSHM) for Hawaii, the 2018 NSHM for the conterminous United States (48 states), the 2012 NSHMs for Guam & the Northern Mariana Islands and American Samoa, the 2007 NSHM for Alaska, and the 2003 NSHM for Puerto Rico & the U.S. Virgin Islands.
Web Interface: None until developed by AASHTO or others.
Web Service (source of data for web interface): https://earthquake.usgs.gov/ws/designmaps/aashto-2023/
Maps: None.
Underlying Gridded Data: https://doi.org/10.5066/P9EACMIX ("AASHTO-USGS Seismic Design Ground Motion Database")
Risk-Targeted Design Ground Motion Calculator (for site-specific analysis): https://earthquake.usgs.gov/ws/nshmp/designmaps/rtgm/.
The earthquake ground motions of this group of seismic design documents are based on the 2018 USGS National Seismic Hazard Model (NSHM) for the conterminous United States (48 states), the 2012 NSHMs for Guam & the Northern Mariana Islands and American Samoa, the 2007 NSHM for Alaska, the 2003 NSHM for Puerto Rico & the U.S. Virgin Islands, and the 1998 NSHM for Hawaii.
Maps: Available from IRC-2024 Section 301.2.2.1 or FEMA P-2192-4.
Web Interface: None specifically for the IRC-2024 maps, but https://ascehazardtool.org/ can be used with the following steps:
Enter the location (address, lat/long, or find on map).
Select (i) ASCE/SEI 7-22 as the "Standard Version," (ii) any "Risk Category" (I-IV), (iii) Default as the "Site Soil Class" (for the mapped seismic design categories), and (iv) Seismic as the "Load Type."
Click on "View Results" and then "Summary" or "Details."
Find the SDS value, and use it to set the Seismic Design Category (SDC) in accordance with IRC-2024 Table R301.2.2.1.1. Note that this IRC SDC is defined differently than the SDC in ASCE/SEI 7 and the IBC.
Maps: Available from IBC-2024 Section 1613.2 or FEMA P-2192-4.
Web Interface: None specifically for the IBC-2024 maps, but https://ascehazardtool.org/ can be used with the following steps:
Enter the location (address, lat/long, or find on map).
Select (i) ASCE/SEI 7-22 as the "Standard Version," (ii) the "Risk Category" of interest (I-IV), (iii) the "Site Soil Class" of interest (e.g., Default for the mapped seismic design categories), and (iv) Seismic as the "Load Type."
Click on "View Results" and then "Summary" or "Details."
Find the Seismic Design Category, which is defined in the same way in ASCE/SEI 7 and the IBC.
Web Interface: https://ascehazardtool.org/
Web Service (source of data for web interface): https://earthquake.usgs.gov/ws/nshmp/designmaps/asce41-23/
Underlying Gridded Data: pending
Web Interface: https://asce7hazardtool.online/.
Web Service (source of data for web interface): https://earthquake.usgs.gov/ws/designmaps/asce7-22.html
Maps: Available from ASCE here or see the 2020 NEHRP Provisions below.
Underlying Gridded Data: https://doi.org/10.5066/P9I0R4O6 ("USGS Seismic Design Geodatabase"; same as 2020 NEHRP Provisions below)
Web Interface: https://www.wbdg.org/additional-resources/tools/bssc2020nehrp
Web Service (source of data for Web Interface): https://earthquake.usgs.gov/ws/designmaps/nehrp-2020.html
Maps (in document): https://www.fema.gov/sites/default/files/2020-10/fema_2020-nehrp-provisions_part-1-and-part-2.pdf
Maps (online only): Under development; preview one example.
Data: https://doi.org/10.5066/P9I0R4O6 ("USGS Seismic Design Geodatabase")
The earthquake ground motions of this group of seismic design documents are based on the 2014 USGS National Seismic Hazard Model (NSHM) for the conterminous United States (48 states), the 2012 NSHMs for Guam & the Northern Mariana Islands and American Samoa, the 2007 NSHM for Alaska, the 2003 NSHM for Puerto Rico & the U.S. Virgin Islands, and the 1998 NSHM for Hawaii.
Web Interface: See 2016 ASCE/SEI 7 Standard below.
Web Service (source of data for Web Interface): See 2016 ASCE/SEI 7 Standard below.
Maps: https://codes.iccsafe.org/content/IBC2018P3/chapter-16-structural-design
Web Interfaces: https://asce7hazardtool.online/, https://seismicmaps.org/, https://hazards.atcouncil.org/
Web Service (source of data for Web Interfaces): https://earthquake.usgs.gov/ws/designmaps/asce7-16.html
Maps: https://www.asce.org/asce-7/
Underlying Gridded Data: https://doi.org/10.5066/P9NT3NRE
Web Interfaces: https://seismicmaps.org/, https://hazards.atcouncil.org/
Web Service (source of data for web interfaces): https://earthquake.usgs.gov/ws/designmaps/nehrp-2015.html
The earthquake ground motions of this group of seismic design documents are based on the 2012 USGS National Seismic Hazard Model (NSHM) for Guam & the Northern Mariana Islands and American Samoa, the 2008 NSHM for the conterminous United States (48 states), the 2007 NSHM for Alaska, and the 2003 NSHM for Puerto Rico & the U.S. Virgin Islands.
The earthquake ground motions of this group of seismic design documents are based on the 2008 USGS National Seismic Hazard Model (NSHM) for the conterminous United States (48 states), the 2007 NSHM for Alaska, the 2003 NSHM for Puerto Rico & the U.S. Virgin Islands, and the 1998 NSHM for Hawaii.
Web Interface: https://ascehazardtool.org/
Web Service (source of data for web interface): https://earthquake.usgs.gov/ws/designmaps/asce7-10.html
Maps: See ASCE/SEI 7-10 Chapter 22 or https://doi.org/10.5066/P1UTDSDT
Underlying Gridded Data: https://doi.org/10.5066/P90R85M7
Risk-Targeted Design Ground Motion Calculator (for site-specific analysis): https://earthquake.usgs.gov/designmaps/rtgm/
Related publications:
Web Interfaces: https://seismicmaps.org/, https://hazards.atcouncil.org/
Web Service (source of data for web interfaces): https://earthquake.usgs.gov/ws/designmaps/nehrp-2009.html
Maps: See FEMA P-750 "Modifications to Chapter 22" or https://doi.org/10.5066/P1UTDSDT
Underlying Gridded Data: https://doi.org/10.5066/P90R85M7
Related publications:
The earthquake ground motions of this group of seismic design documents are based on the 2003 USGS National Seismic Hazard Model (NSHM) for Puerto Rico & the U.S. Virgin Islands, the 2002 NSHM for the conterminous United States (48 states), the 1999 NSHM for Alaska, and the 1998 NSHM for Hawaii.
Web Interfaces: None known.
Web Service (source of data for web interfaces): https://earthquake.usgs.gov/ws/designmaps/aashto-2009.html (with step-by-step instructions at https://www.usgs.gov/media/files/step-step-instructions-aashto-guide-specifications)
Maps (in documents): See, e.g., the AASHTO LRFD Bridge Design Specifications, 9th Edition and AASHTO Guide Specifications for LRFD Seismic Bridge Design, 2nd Edition, with 2012, 2014, and 2015 Interim Revisions.
Data: https://www.sciencebase.gov/catalog/item/5b2bb1bbe4b040769c10743f. For access, please email zkortum@usgs.gov and nluco@usgs.gov.
The earthquake ground motions of this group of seismic design documents are based on the 1996 USGS National Seismic Hazard Model (NSHM) for the conterminous United States (48 states).