Is your home in an earthquake zone?
Free seismic hazard reports using USGS data. Enter any US address to see your earthquake risk, seismic design category, and recent earthquakes nearby.
What you'll learn
Seismic Hazard Level
Peak ground acceleration, seismic design category, and what it means for your property in plain English.
Recent Earthquakes
Earthquakes within 100 km of your location in the past year, with magnitudes and distances.
Building Code Impact
ASCE 7-22 seismic design parameters that determine construction requirements in your area.
Browse by State
Frequently Asked Questions
How do I know if my house is in an earthquake zone?
Enter your address in the search box above. We'll query USGS seismic hazard data and show your location's Peak Ground Acceleration (PGA), Seismic Design Category, and any recent earthquakes nearby. Every location in the US has some level of seismic hazard — the question is how much.
What is Peak Ground Acceleration (PGA)?
PGA measures the maximum ground shaking expected at a site during a design-level earthquake, expressed as a fraction of gravity (g). A PGA of 0.10g means the ground could accelerate at 10% of gravity. Higher PGA means stronger expected shaking and more stringent building requirements.
What is a Seismic Design Category?
Seismic Design Categories (A through F) are assigned by building codes based on ground shaking intensity and soil conditions. Category A has minimal requirements, while Categories D through F require increasingly stringent structural design to resist earthquake forces. Most of California is Category D or higher.
Do I need earthquake insurance?
Standard homeowner insurance does not cover earthquake damage. Whether you need a separate earthquake policy depends on your location's risk level, your home's age and construction type, and your financial situation. Locations with PGA above 0.20g should strongly consider it. Our reports can help you assess your risk level.
Where does this data come from?
All data comes from the United States Geological Survey (USGS). Seismic hazard parameters use the ASCE 7-22 Seismic Design Maps API. Earthquake events come from the USGS FDSN earthquake catalog. We query USGS in real time — nothing is modified or interpreted beyond plain-English explanations.