The second explosion Attack was equivalent to over 2 tonnes of TNT .

The bomb contained Containing the equivalent of of TNT .

A spherical charge of of TNT was detonated Attack on a tower above ground level and above the rainforest canopy .

Castle Bravo 's yield was 15 megatons of TNT , 2.5 times the predicted 6.0 megatons , due to unforeseen additional reactions involving Cause_to_be_included Li , which led to Causation the unexpected radioactive contamination of areas to the east of Bikini Atoll .

Government sources speculated Coming_to_believe that the bombers may have been transporting Bringing TNT to a downtown location in anticipation of the annual May Day parade Social_event on May 9 .

The bulk of the object 's energy was absorbed by the atmosphere , with a total kinetic energy before atmospheric impact Influence estimated from infrasound and seismic measurements to be equivalent to the blast yield of 400–500 kilotons of TNT ( about 1.4–1.8 PJ ) range – 26 to 33 times as much energy as that released Causation from the atomic bomb detonated Attack at Hiroshima .