"Hypocenter Cenotaph" falling center monument under Nagasaki Atomic Bomb

   The Nagasaki Atomic Bomb of "Hypocenter Cenotaph" is standing at the center point of the explosion burst, which is a triangular prism with a height of 6.6 m. It was built in 1968 as the second generation. On August 9, 1945, at 11:02 AM, it exploded in the sky about 500 m above the 171 Matsuyama-cho, Nagasaki City. The temperature at the center reached several million degrees Celsius. Ten thousandths of a second from the explosion, it formed about 300,000 degrees fireball. The fireball became the maximum after 1 second of explosion and expanded to a radius of about 240 m. The temperature of the ground surface of the hypocenter immediately after the explosion reached about 3,000 to 4,000 degrees.