USGS hazard maps assume firm rock (Site Class B/C). Your actual site is soil, and that changes ground motion amplification by 2-3x.
Site Class E soils double design forces. Liquefaction mitigation costs 5-50 per sqft. SDC D adds 20-30% to structural costs vs SDC A.
Wasatch Front: 43% chance of M6.75+ in 50 years. Reno, Boise, Jackson Hole also at significant risk.