Site class, design parameters, spectra and report text, per ASCE 7-22 and the 2025 CBC
- Site Class from measured or estimated Vs30, or a layered Vs profile (Chapter 20), including the estimated-Vs bound check and default site class
- Careful Site Class F screening, with the T ≤ 0.5 s liquefaction exception and Chapter 21 requirements
- USGS ASCE 7-22 parameters (SDS, SD1, SMS, SM1, PGAM, SDC, TL) with multi-period and two-period spectra you can copy as x,y pairs
- Report-ready "Seismic Design Parameters" write-up for each case
Disclaimer: This tool is approximate and may contain errors. Engineers must independently verify all output (e.g., with the USGS/ATC hazard tools and hand calculations) and use professional judgment to select design values.