Whether you're buying a home or assessing your current property, understanding earthquake risk is essential for millions of Americans.
Three Ways to Check Earthquake Risk
1. USGS Seismic Hazard Maps
The US Geological Survey publishes probabilistic seismic hazard maps showing the likelihood of earthquake shaking across the country. These maps are updated regularly and form the basis for building codes.
2. Known Fault Lines
Major fault systems like the San Andreas (California), Cascadia Subduction Zone (Pacific Northwest), and New Madrid (Central US) pose significant risk. The USGS Quaternary Fault database maps all known active faults.
3. Site Amplification
Soft soils and sedimentary basins amplify earthquake shaking. The Mexico City effect—where distant earthquakes cause severe damage due to basin resonance—can occur in many cities built on former lakebeds or filled land.
The Easy Way
TerraNet integrates USGS data into a simple risk score for any US address. No technical knowledge required—just enter your address.