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http://allshookup.org/quakes/atomic.htmThe First Maralinga Explosion
The weather was at first unfavourable at Maralinga for the initial test in Spring 1956. Some 1500 scientists and soldiers were waiting for this first test.
On a clear spring day, the first explosion was ignited. Only near the detonation point was ground motion felt, but people living hundreds of kilometers away heard the sound waves through the air. At Cook two or three distinct blasts were heard about 12 to 13 minutes after the detonation flash. At Kingoonya, 400kms from Maralinga, there was an explosion like a clap of thunder, shutters rattled and houses shook. On the coast, 300kms away at Ceduna, two large bangs rang out- like sticks of dynamite going off.
The first atomic bomb in the Maralinga series was about equal in power to that which destroyed Hiroshima. The device had been suspended from a 110 metre tower. The most distant seismograph known to have recorded it was at Southern Cross, 1000kms away.
The fission detonation produced the usual fireball, flash and cloud. The cloud then became distorted by winds in the upper atmosphere, and it gradually drifted away to the northeast, over the empty desert. An hour after the explosion, news reporters flying over the site reported a shallow, ash grey crater, about 500 metres across. The tower had been vapourised, and smoking equipment dumps and burning scrub streched for over two kms.