Includes USGS Lava-Flow Hazard Zones (official) + example eruption outlines (stylized).
Use the speed tool to estimate average flow-front speed between two points.
Click two points on the map → distance + average speed (km/h) are computed.
(Esc exits tool)
Distance:—
Avg speed:—
Point A:—
Point B:—
Data note: hazard zones come from Hawaiʻi’s statewide GIS/USGS layer. [oai_citation:2‡geodata.hawaii.gov](https://geodata.hawaii.gov/arcgis/rest/services/Hazards/MapServer/3?utm_source=chatgpt.com)
Legend
Hazard Zone 1 (highest)
Hazard Zone 2
Hazard Zone 3
Hazard Zone 4
Hazard Zone 5
Hazard Zone 6
Hazard Zone 7
Hazard Zone 8–9 (lowest)
Tip: click a hazard zone polygon to see its zone code.