SEAOC and HCAI (formerly OSHPD) developed this web interface that uses the USGS web services and retrieve the seismic design data and presents it in a report format. This website does not perform any calculations to the table values. To allow the seismic design data to remain free to all, this website is open-source so feel free to copy the source code on github. Please contact us for feedback.



Structural Engineers Association of California’s (SEAOC) 3,500 members include licensed Structural Engineers, engineers who practice structural engineering, researchers, teachers, students, industry members, associate and affiliate members committed to improving the safety and resilience of the built environment. Through SEAOC and its MOs, our members participate in code advisory work, receive educational opportunities, obtain technical resources, engage in local and state policy advocacy, and build their social and professional networks - all within the rich traditions of organizations that date back almost a century.



California’s Department of Health Care Access and Information (formerly named Office of Statewide Health Planning and Development, OSHPD) is the leader in collecting data and disseminating information about California’s healthcare infrastructure. HCAI promotes an equitably distributed healthcare workforce, and publishes valuable information about healthcare outcomes. HCAI also monitors the construction, renovation, and seismic safety of hospitals and skilled nursing facilities and provides loan insurance to assist the capital needs of California’s not-for-profit healthcare facilities.



Special thanks to the United States Geological Survey (USGS)

USGS has been a key partner in making this project possible. Their commitment to open data and public service has allowed us to provide reliable information to the community. The seismic data featured on this website represents decades of research, development, and refinement by USGS — work that we serve as an interface to share with the community. We sincerely appreciate their collaboration and the work they do every day to keep the public informed and supported. This website benefits greatly from their ongoing dedication to advancing earth science, and their leadership continues to inspire and strengthen the work we do here.