The map above simulates a 300-kiloton nuclear airburst over Karachi, Pakistan — roughly the size of a modern deployed warhead. The coloured rings show the estimated fireball, the zones of heavy, moderate and light blast damage, the reach of the thermal flash and the ionizing-radiation dose. Drag the marker or change the weapon in the full simulator to explore other scenarios.
The metropolitan area is home to about 17.2 million people — the rings above are drawn to real scale over their homes.
The marker is in the old centre near Saddar and the Empress Market. The 1.9 km zone of total destruction covers Saddar, the Sindh Assembly, Frere Hall and the I.I. Chundrigar business district; the 4.7 km collapse ring reaches Clifton's northern blocks, the Civil Hospital, Lyari and Karachi Cantonment station. Third-degree burns extend to about 7.5 km over Lyari, Kharadar, the port's eastern berths, Clifton beach and the PECHS neighbourhoods; the 14.5 km ring of broken windows reaches Nazimabad, Gulshan-e-Iqbal's edge, Korangi and Defence Housing Authority.
Karachi has about 17 million people and some of the densest districts in South Asia — Lyari and the old city hold over 50,000 per square kilometre. The Arabian Sea to the south takes part of the blast; the rest of the city is flat. Pakistan is a nuclear-armed state and Karachi is its largest city and main port, which explains why Karachi–Mumbai pairs appear in the recent detonations so often. See Nuclear arsenals.
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