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City scenario

Mumbai nuclear blast radius

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Mumbai’s peninsula packs offices, rail, and dense housing onto a narrow island. A 15 kt airburst here is a compact-city lesson: short distances, high counts on the WorldPop grid.

Open Mumbai in the 3D simulator

Educational estimate only. Blast and heat rings use simplified yield scaling. They ignore terrain, weather, shielding, and weapon design. Casualty counts use WorldPop 2020 residents on an approximately 1 km grid and ignore time of day, commuting, shelter, and evacuation. This is not a targeting or civil-defense tool. About the model.

Aim point: South Mumbai island core · Weapon: Little Boy (15 kt, 543 m (1,780 ft) optimum airburst)

Ground ranges for Little Boy (15 kt, 543 m (1,780 ft) optimum airburst) in this simulator.
Effect Ground range What the model means
Fireball 266 m (872 ft) Maximum luminous radius
20 psi 839 m (2,751 ft) Heavy destruction
5 psi 1.8 km (1.1 mi) Most buildings collapse
Thermal 2.0 km (1.3 mi) 3rd-degree burns
1 psi 4.2 km (2.6 mi) Windows shatter
Rings scaled to 1 psi. Yellow fireball, red 20 psi, orange 5 psi, gold thermal, blue 1 psi. Not a map of buildings.

Casualty estimate at this pin

People on the WorldPop 2020 grid inside this scenario’s 1 psi ring. Rounded educational estimate, not a forecast.
Estimated deaths 248,251
Estimated injuries 293,770
Residents inside 1 psi 1,032,509

What the rings cover

Inner rings cover a tight south-island cluster of commercial and residential blocks. 5 psi and thermal effects stay on the peninsula’s dense core. 1 psi can reach along the island and toward the harbour without covering the whole metropolitan region.

The preset sits in the crowded southern core rather than in the geographic middle of the municipal area. That is deliberate. Casualty estimates in this tool count residents on a 1 km grid, so a pin on open water or a park would understate what people come here to understand.

Because the island is thin, rings that would be ‘Midtown only’ in New York spill toward the harbour more quickly. The model still ignores storm season, building type, and the suburban mainland.

Open the globe if you want to drag the burst north along the Western Railway or across to Navi Mumbai. This page stays on one educational pin so search engines can read the numbers.

Related pages

Delhi · Dhaka · Manila · New York

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City index · Historic sites · Weapon yields

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