Volcano Hazard Zone Calculator
Hazard radius from eruption type and VEI.
Inputs
Results
Pyroclastic flow radius (km)
7.94
Lahar hazard distance (km)19.06
Ashfall radius (km)223.87
Eruption column (km)11.19
Ejecta volume (m³)10,000,000
Risk at your distance (0-100)54.5
How to Use This Calculator
- Select the Volcanic Explosivity Index (VEI 0–8): 0 is gentle Hawaiian lava flows, 3 is sub-Plinian, 8 is supervolcano scale.
- Choose the Eruption type: 0=Effusive, 1=Explosive/Plinian, 2=Phreatic steam-driven, 3=Pyroclastic flow-dominant.
- Enter Summit elevation (m) — snow-capped, high-elevation volcanoes produce more dangerous lahars when snow melts.
- Enter Your distance (km) from the volcanic vent to get a site-specific Risk score (0–100).
- Compare your distance to the Pyroclastic flow radius (km), Lahar distance (km), and Ashfall radius (km) to understand which hazards reach your location.
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