This page shows a simulation of the 15 kt nuclear bomb (15 kt) detonated over Hiroshima, Japan (1945). The map displays the estimated fireball, the zones of heavy, moderate and light blast damage, thermal radiation and ionizing radiation. Click «What does that mean?» for a detailed legend, or run your own detonation on the main page.
Hiroshima, 6 August 1945
At 8:15 in the morning the uranium gun-type bomb Little Boy exploded about 600 metres above Shima Hospital in the centre of Hiroshima, a few hundred metres from the Aioi Bridge that the bombardier had been aiming at. The yield is now estimated at 15 kilotons. On this map the fireball is about 360 metres across, the zone of total destruction reaches about 700 metres and the ring where ordinary houses collapse runs to roughly 1.7 km — small circles compared with modern weapons, but they sat directly over the densest part of a city of 350,000 people.
Almost everything within 1.5 km was flattened or burned out; the thermal flash started fires across the delta that merged into a firestorm within an hour. Somewhere between 70,000 and 80,000 people died on the first day and the toll reached about 140,000 by the end of the year. The Genbaku Dome, 160 metres from the hypocentre, survived because the blast came almost straight down, and it is now the Peace Memorial.
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