On 4 August, a powerful blast ravaged the Beirut port area. A substantial store of ammonium nitrate in a warehouse was the cause of the explosion. 

As the details unfold, our explosive and forensic experts at the Spadeadam research and testing facility in the UK analyse the TNT equivalence and calculate the distance the shock and the rarefaction* travel in each frame of some of the video footage. Download the analysis below.       

_{*A common rarefaction wave is the area of low relative pressure following a shock wave}