ASCE 7-22 SDS Map
Design spectral acceleration at short periods, for the ASCE 7-22 default site class, across every mapped United States region.
Click or tap the map for the mapped parameters at the nearest grid point. Pinch or double-tap to zoom, drag to pan. Switch to “At or above” to shade every area at or over a value you set.
At this point
Click the map to read the mapped values at the nearest grid point.
SDS, g
What this map shows
SDS is the design spectral response acceleration at short periods — the term that sets the horizontal force most equipment is designed and certified for. Values are for the ASCE 7-22 default site class, the envelope of Site Classes C, CD and D used where a site’s soil properties are not known.
They come from the U.S. Geological Survey data release behind the 2020 NEHRP Provisions and ASCE/SEI 7-22 (doi:10.5066/P9I0R4O6), on grids of 0.05° in the lower 48 and 0.01° to 0.10° elsewhere.
For design, use the ASCE Hazard Tool at your exact site. This map is for screening and comparison: it reads values from the nearest grid point rather than interpolating to a coordinate, and it assumes the default site class.
Smoothed interpolates between the published grid points so the contours read as continuous; Grid cells shows each published point as the square it represents, with nothing done to it. The readout always quotes the nearest grid point either way.
The seismic values are USGS data and in the public domain. This tool — its code, its processed grids and its presentation — is Copyright Pre Compliance 2026, All Rights Reserved, and is provided for your own use under our standard terms and conditions. To reuse or embed it, write to inquiries@go-pre.com.
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