"Hypocenter Cenotaph" supposed to be dropping 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.