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The bomb exploded about 500 m. (1,625 ft.) above the ground and directly beneath it (the hypocentre) was a suburb of schools, factories, and private houses. The radius of destruction for reinforced concrete buildings was 750 m. (2,437 ft.), greater than at Hiroshima where the blast caused by the bomb was more vertical.
Report Abuse. It depends on how you define the blast radius. The Hiroshima bomb was about 15 kilotons TNT equivalent, and there was generally complete destruction out to about 8000 feet. But even at a distance of 26,000 feet from ground zero in Hiroshima, some building tiles were displaced. Most nuclear weapons today average about 250 kilotons TNT, are would have a blast radius about 4 or 5 times bigger.