The sound of the largest explosion is estimated to have been 180dB at 160km distance, and SPL falls off by 6 dB for each doubling of distance, so at the commonly used 1m distance it would have been over 280 dB.
this post was submitted on 08 May 2024
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And 286dB at 0.5m, and 292dB at 0.25m, and infinity dB at 0m