A vulnerability function converts hazard intensity into a damage ratio — the economic engine of every catastrophe model. This tool gives direct access to FEMA Hazus 6.1, covering flood, wind and earthquake vulnerability.
What you can do
Filter and browseNarrow functions by material, occupancy, country, design level and loss type.
Compare two curvesOverlay any two functions on the same chart with fully independent filter sets.
Export chart as PNGDownload any chart with the selection title, ready for reports.
Copy dataCopy the full data table to clipboard. In compare mode both curves are included side by side.
Switch unitsFlood depth in m or ft, wind speed in m/s, km/h or mph, PGA in g or m/s².
Browser-basedRuns entirely in your browser. No software installation or account required.
Frequently asked questions
A mathematical relationship between hazard intensity (depth, speed, acceleration) and damage ratio, the fraction of a building's replacement value that is destroyed. Vulnerability functions are the economic engine of every catastrophe model.
A vulnerability function gives the mean damage ratio at each intensity level, used for flood and wind. A fragility curve gives the probability of reaching or exceeding a damage state threshold, used for earthquake. Both types are in this tool.
With caution. HAZUS was calibrated on US construction stock, so results for other regions should be treated as an approximation and sanity-checked against local data where possible.
3-second peak gust at 10 m above ground in open terrain. The tool also shows 1-minute sustained speeds and converts to km/h and mph automatically.