What we screen
What we screen in every GeoScreen report.
Each preliminary screening checks a Southern California parcel against the public agency hazard maps that matter for due diligence. Pick a hazard below to see what the report checks and which agency data it cites.
Active fault proximity
GeoScreen checks whether a parcel falls inside a state-designated Alquist-Priolo Earthquake Fault Zone and reports its proximity to mapped active faults. The screening tells you what the California Geological Survey fault data shows for that location, with the data source cited, so you know whether fault rupture is a factor to investigate further.
Seismic shaking & ground-failure zones
Using the California Geological Survey Seismic Hazard Zones, GeoScreen reports whether a parcel intersects an official Zone of Required Investigation for earthquake-induced ground failure. The screening surfaces what the state seismic data indicates for the parcel — a flag for further investigation, not a structural assessment.
Liquefaction zones
GeoScreen checks the California Geological Survey liquefaction Zones of Required Investigation to report whether a parcel sits within a mapped liquefaction zone. The result reflects what the official state data shows and cites that source; it does not assess soils on the parcel itself.
Landslide zones & inventory
GeoScreen checks both the state earthquake-induced landslide Zones of Required Investigation and the mapped landslide inventory to report whether a parcel falls within, or near, a mapped landslide feature. The screening reports what the agency landslide data indicates for the location, with the source cited.
Slope & terrain
Using public USGS elevation data, GeoScreen estimates the slope and terrain across a parcel. Steeper terrain is one of several factors a professional may want to examine, so the screening reports what the elevation data indicates — the estimate is preliminary and best-effort, never a stability determination.
Wildfire severity zones
GeoScreen checks the CAL FIRE Fire Hazard Severity Zones to report whether a parcel falls within a state-designated severity zone, and which designation applies. The screening reports the official CAL FIRE designation for the location with the source cited — it reports the state map, it does not predict a fire.
Flood & debris-flow exposure
GeoScreen checks the FEMA National Flood Hazard Layer to report whether a parcel intersects a mapped flood hazard zone, and surfaces a best-effort debris-flow proximity flag drawn from public post-fire data. The screening reports what the federal flood map shows, with the source cited; the debris-flow flag is a proximity indicator, not a determination.