What this is
Companion to SURVIVAL MAP, focused on painting where is relatively safer.
It starts from 1945 Tokyo. US bombing concentrated on strategic targets β munitions factories, rail, ports, power β and the city around them. What survived was mostly far from targets, or stopped by open ground: temples, cemeteries, large gardens, rivers. Use the before (1936β42 Army) β after (1945β50 US) swipe to see for yourself what remained.
The score starts at 100 and deducts for flood, tsunami, storm-surge and landslide zones, Meiji-era wetlands, elevation under 3 m, distance to today's strategic targets (military, major power plants, fuel, ports, airports) and distance to a missile shelter. A nearby underground shelter adds points. Tapping a point also shows J-SHIS earthquake probability and current lightning.
Sources and limits
- The nuclear estimate uses scaling laws from Glasstone & Dolan, The Effects of Nuclear Weapons, for an airburst; surface bursts, terrain and weather change it greatly. The fallout wedge uses current surface wind; real fallout follows upper winds and shifts over time. Do not base evacuation decisions on it.
- Designated evacuation sites are for natural disasters. Missile-grade emergency shelters (underground stations, malls) are a separate list per prefecture on the Civil Protection Portal. Tokyo is already on this map (5,163 entries from the Tokyo Metropolitan list, geocoded with GSI, 99% matched).
- The 1945β50 aerial photos cover urban areas only. Post-war redevelopment changed terrain and buildings; treat surviving districts as hints, not rules.
- Hazard legends follow the Hazard Map Portal.
- This tool does not replace official instructions. In an emergency, J-Alert, your municipality and NHK come first.